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1.70 Carat Natural Loose Purple Spinel Emerald Shape Gemstone
Located in Peshawar, PK
, spinel has often been mistaken for other gemstones like ruby and sapphire throughout history. One of the
Category

21st Century and Contemporary Burmese Arts and Crafts Loose Gemstones

Materials

Spinel

1.80 Carat Natural Loose Purple Spinel Cushion Shape Gemstone
Located in Peshawar, PK
mistaken for other gemstones like ruby and sapphire throughout history. One of the most famous examples is
Category

21st Century and Contemporary Malagasy Arts and Crafts Loose Gemstones

Materials

Spinel

2.63ct Octagonal/Square Purple-Red Natural Ruby GIA Certified East Africa Unheat
Located in Toronto, Ontario
This is a stunning GIA Certified Natural Ruby The GIA report reads as follows: GIA Report
Category

2010s North African Loose Gemstones

Materials

Ruby

Certified Natural Loose 1.46 Carat Ruby Cushion Shape Gem For Engagement Ring
Located in Peshawar, PK
Afghanistan, is renowned for its exceptional rubies. These precious gemstones from the Panjshir Province have
Category

21st Century and Contemporary Afghan Arts and Crafts Loose Gemstones

Materials

Ruby

Set of 2 Loose Rubies - Round .60ctw Pinkish Red Matched Pair
Located in Greensboro, NC
Treatment: Heating Total Carats: .60ctw Cut: Round Color: Pinkish Red Stone 1 Size (mm): 4.00 x 4.06 x 2.57 Stone 2 Size (mm): 3.94 x 3.96 x 2.63 Condition: New without Tags
Category

21st Century and Contemporary Loose Gemstones

Materials

Ruby

1.50 Carat Natural Loose Purple Spinel Cushion Shape Gemstone
Located in Peshawar, PK
mistaken for other gemstones like ruby and sapphire throughout history. One of the most famous examples is
Category

21st Century and Contemporary Burmese Arts and Crafts Loose Gemstones

Materials

Spinel

1.65 Carat Natural Loose Purple Spinel Cushion Shape Gemstone
Located in Peshawar, PK
mistaken for other gemstones like ruby and sapphire throughout history. One of the most famous examples is
Category

21st Century and Contemporary Burmese Arts and Crafts Loose Gemstones

Materials

Spinel

Set of 2 Loose Rubies - Round .51ctw Pinkish Red Matched Pair
Located in Greensboro, NC
Treatment: Heating Total Carats: .51ctw Cut: Round Color: Pinkish Red Stone 1 Size (mm): 3.7 x 3.7 x 2.5 Stone 2 Size (mm): 3.7 x 3.7 x 1.8 Condition: New without Tags
Category

21st Century and Contemporary Loose Gemstones

Materials

Ruby

Certified 3.11 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 3.11 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural Weight: 3.11
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 4.43 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 4.43 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural Weight: 4.43
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 4.12 Carats Mozambique Ruby Oval Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 4.12 Carats Mozambique Ruby Oval Faceted Cut stone No Heat Natural Weight: 4.12 Carats
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 3.28 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 3.28 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural Weight: 3.28
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 3.13 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 3.13 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural Weight: 3.13
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 4.03 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 4.03 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural Weight: 4.03
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

1.95 Carat Natural Loose Greyish Purple Spinel Emerald Shape Gemstone
Located in Peshawar, PK
red, pink, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby and
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel

2.20 Carat Natural Loose Pink Spinel Oval Shape Tanzanian’s Gemstone
Located in Peshawar, PK
, violet, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire throughout
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel

1.75 Carat Natural Loose Light Pink Spinel Oval Shape Gemstone
Located in Peshawar, PK
, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel

0.90 Carat Natural Loose Peach Pink Spinel Heart Shape Gemstone
Located in Peshawar, PK
, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel

1.45 Carat Natural Loose Lavender Purple Spinel Cushion Shape Gemstone
Located in Peshawar, PK
, including red, pink, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel

Certified 3.78 Carats Mozambique Ruby Hexagon Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 3.78 Carats Mozambique Ruby Hexagon Faceted Cut stone No Heat Natural Weight: 3.78
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

2.30 Carat Natural Loose Pink Spinel Cushion Shape Tanzania’s Gemstone
Located in Peshawar, PK
, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel

0.85 Carat Natural Loose Pink Spinel Heart Shape Tanzania’s Gemstone
Located in Peshawar, PK
, violet, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire throughout
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel

43.45 Carats NO HEAT Ruby Mozambique Cut Stone Marquise Fine Quality Natural
Located in Jaipur, RJ
43.45 Carats NO HEAT Ruby Mozambique Cut Stone Marquise Fine Quality Natural Weight: 43.65
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

1.20 Carat Natural Loose Purple Colour Spinel Heart Shape Gemstone
Located in Peshawar, PK
, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel

1.95 Carat Natural Loose Purple Spinel Cushion Cut Gemstone From Tanzania
Located in Peshawar, PK
, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire throughout
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel, Other

0.85 Carat Natural Loose Peachy Pink Spinel Heart Shape Gemstone
Located in Peshawar, PK
, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel

1.50 Carat Natural Loose Baby Pink Spinel Heart Shape Gemstone
Located in Peshawar, PK
, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel

222.27 carats ruby Mozambique cut stone cushion 33 Pieces layout heated natural
Located in Jaipur, RJ
222.27 carats ruby Mozambique cut stone cushion 33 Pieces layout heated natural Weight: 222.27
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

AGA Certified 2.56 Carat Natural Loose Burmese Spinel Cushion Cut Gemstone
Located in Peshawar, PK
, including red, pink, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby
Category

21st Century and Contemporary Burmese Arts and Crafts Loose Gemstones

Materials

Spinel, Other

GFCO Certified 1.20 Carat Natural Loose Red Spinel Pear Shape Gemstone
Located in Peshawar, PK
, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire
Category

21st Century and Contemporary Burmese Arts and Crafts Loose Gemstones

Materials

Spinel, Other

1.60 Carats Natural Loose Red Burmese Spine Ring Gemstone
Located in Peshawar, PK
British Crown Jewels, where they were initially thought to be rubies. This gemstone belongs to the spinel
Category

Late 20th Century Burmese Aesthetic Movement Loose Gemstones

Materials

Spinel

AIG Certified 2.07 Carat Natural Loose Purple Spinel Oval Cut Gemstone
Located in Peshawar, PK
, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire throughout
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel, Other

AIG Certified 2.63 Carat Natural Loose Purple Spinel Cushion Cut Gemstone
Located in Peshawar, PK
, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire throughout
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel, Other

Certified 3.11 Carats Mozambique Ruby Oval Faceted Cut stone No Heat Natural Gem
Located in Jaipur, RJ
Certified 3.11 Carats Mozambique Ruby Oval Faceted Cut stone No Heat Natural Gem Gemstone - Ruby
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

AIG Certified 3.21 Carat Natural Loose Spinel Gemstone From Tanzania, Africa
Located in Peshawar, PK
, including red, pink, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel, Other

Natural Unheated Red Mozambique Ruby Stone 2.49 cts with GIA Report / JupiterGem
Located in Los Angeles, CA
Please inquire for more videos/photos. Details Identification: Natural Unheated Mozambique Ruby
Category

21st Century and Contemporary Mozambican Loose Gemstones

Materials

Ruby

IGA Certified 2.60 Carat Natural Burmese Red Spinel Cushion Cut Gemstone
Located in Peshawar, PK
red, pink, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby and
Category

21st Century and Contemporary Burmese Arts and Crafts Loose Gemstones

Materials

Spinel, Other

AIG Certified 3.33 Carat Natural Loose Purple Spinel Cushion Shape Gemstone
Located in Peshawar, PK
, blue, violet, and orange, spinel has often been mistaken for other gemstones like ruby and sapphire
Category

21st Century and Contemporary Tanzanian Arts and Crafts Loose Gemstones

Materials

Spinel

Natural Red Ruby Matching Pair Stones 3.98 carats with GRS Report / JupiterGem
Located in Los Angeles, CA
Please inquire for more videos/photos. Details Identification: Natural Heated Ruby Pair • Carat
Category

21st Century and Contemporary Mozambican Loose Gemstones

Materials

Ruby

Certified 3.27 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 3.27 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural Weight: 3.27
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 3.71 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 3.71 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural Weight: 3.71
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 10.44 Carats Mozambique Ruby Pear Faceted Cutstone No Heat Natural Gem
Located in Jaipur, RJ
Certified 10.44 Carats Mozambique Ruby Pear Faceted Cutstone No Heat Natural Gem Weight: 10.44
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 1.85 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 1.85 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural Weight: 1.85
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 2.53 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 2.53 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural Weight: 2.53
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 1.77 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 1.77 Carats Mozambique Ruby Cushion Faceted Cut stone No Heat Natural Weight: 1.77
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 2.31 Carats Mozambique Ruby Round Faceted Cutstone No Heat Natural Gem
Located in Jaipur, RJ
Certified 2.31 Carats Mozambique Ruby Round Faceted Cut stone No Heat Natural Gem Weight: 2.31
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 1.44 Carats Mozambique Ruby Round Faceted Cutstone No Heat Natural Gem
Located in Jaipur, RJ
Certified 1.44 Carats Mozambique Ruby Round Faceted Cut stone No Heat Natural Gem Weight: 1.44
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 6.56 Carats Burma Ruby Cushion Faceted Cut stone No Heat Natural Gem
Located in Jaipur, RJ
Certified 6.56 Carats Burma Ruby Cushion Faceted Cut stone No Heat Natural Gem Weight: 6.56 Carats
Category

21st Century and Contemporary Burmese Art Deco Loose Gemstones

Materials

Ruby

Marvel x ECG 1.86 Carat Reality Stone Ruby Limited Edition #12 of 300
Located in New York, NY
This striking Reality Stone oval cut ruby has phenomenal clarity and depth of color. It was cut and
Category

21st Century and Contemporary Mozambican Contemporary Loose Gemstones

Materials

Ruby

1.85 Carat Natural Loose Purplish Pink Spinel Cushion Shape Gemstone
Located in Peshawar, PK
, spinel has often been mistaken for other gemstones like ruby and sapphire throughout history. One of the
Category

21st Century and Contemporary Burmese Arts and Crafts Loose Gemstones

Materials

Spinel

Certified 13.36 Carat Mozambique Ruby Oval Faceted Cut stone No Heat Natural Gem
Located in Jaipur, RJ
Certified 13.36 Carats Mozambique Ruby Oval Faceted Cut stone No Heat Natural Gem Weight: 13.36
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 3.13 Carats Mozambique Ruby Pear Faceted Cut stone No Heat Natural Gem
Located in Jaipur, RJ
Certified 3.13 Carats Mozambique Ruby Pear Faceted Cut stone No Heat Natural Gem Weight: 3.13
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 1.36 Carats Mozambique Ruby Oval Faceted Cut stone No Heat Natural Gem
Located in Jaipur, RJ
Certified 1.36 Carats Mozambique Ruby Oval Faceted Cut stone No Heat Natural Gem Weight: 1.36
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

1.55 Carat Natural Loose Purplish Pink Spinel Cushion Shape Gemstone
Located in Peshawar, PK
often been mistaken for other gemstones like ruby and sapphire throughout history. One of the most
Category

21st Century and Contemporary Burmese Arts and Crafts Loose Gemstones

Materials

Spinel

1.85 Carat Natural Loose Maroon Pink Spinel Gemstone From Myanmar
Located in Peshawar, PK
often been mistaken for other gemstones like ruby and sapphire throughout history. One of the most
Category

21st Century and Contemporary Burmese Arts and Crafts Loose Gemstones

Materials

Spinel

Certified 1.81 Carats Mozambique Ruby Hexagon Faceted Cut stone No Heat Natural
Located in Jaipur, RJ
Certified 1.81 Carats Mozambique Ruby Hexagon Faceted Cut stone No Heat Natural Weight: 1.81
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

Certified 3.72 Carats Mozambique Ruby Fancy Faceted Cutstone No Heat Natural Gem
Located in Jaipur, RJ
Certified 3.72 Carats Mozambique Ruby Fancy Faceted Cut stone No Heat Natural Gem Weight: 3.72
Category

21st Century and Contemporary Mozambican Art Deco Loose Gemstones

Materials

Ruby

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Ruby Gemstone For Sale on 1stDibs

Find the exact ruby gemstone you’re shopping for in the variety available on 1stDibs. Every item for sale was constructed with extraordinary care, often using gold, 18k gold and yellow gold. Our collection of these items for sale includes 2845 vintage editions and 5923 modern creations to choose from as well. You’re likely to find the perfect ruby gemstone among the distinctive items we have available, which includes versions made as long ago as the 18th Century as well as those produced as recently as the 21st Century. Creating a ruby gemstone has been a part of the legacy of many jewelers, but those produced by Bochic, VR Jewels and Unbranded are consistently popular. See these pages for a round cut iteration of this accessory, while there are also oval cut cut and brilliant cut cut versions available here, too. When shopping for a ruby gemstone, you’ll find that there are less available pieces for unisex or men today than there are for women.

How Much is a Ruby Gemstone?

The price for a ruby gemstone starts at $1 and tops out at $6,500,000 with these rings, on average, selling for $3,007.

Why Gold Shines in Jewelry Craftsmanship

Gold is the feel-good metal, the serotonin of jewelry. Wear vintage and antique gold necklaces, watches, gold bracelets or gold rings and you feel happy, you feel dressed, you feel, well, yourself. 

Gold, especially yellow gold, with its rich patina and ancient pedigree going back thousands of years, is the steady standby, the well-mannered metal of choice. Any discussion of this lustrous metal comes down to a basic truth: Gold is elementary, my dear. Gold jewelry that couples the mystique of the metal with superb design and craftsmanship achieves the status of an enduring classic. Many luxury houses have given us some of our most treasured and lasting examples of gold jewelry over the years.

Since its founding, in 1837, Tiffany Co. has built its reputation on its company jewelry as well as its coterie of boutique designers, which has included Jean Schlumberger, Donald Claflin, Angela Cummings and Elsa Peretti. There are numerous gold Tiffany classics worth citing. Some are accented with gemstones, but all stand out for their design and the workmanship displayed.

For the woman who prefers a minimalist look, the Tiffany Co. twist bangle (thin, slightly ovoid) is stylishly simple. For Cummings devotees, signature pieces feature hard stone inlay, such as her pairs of gold ear clips inlaid with black jade (a play on the classic Chanel black and tan), or bangles whose design recalls ocean waves, with undulating lines of lapis lazuli and mother-of-pearl. And just about any design by the great Jean Schlumberger is by definition a classic.

Even had he eschewed stones and diamonds, Southern-born David Webb would be hailed for the vast arsenal of heavy gold jewelry he designed. Gold, usually hammered or textured in some manner, defines great David Webb jewelry. The self-taught jeweler made very au courant pieces while drawing inspiration from ancient and out-of-the-way sources — East meets West in the commanding gold necklaces made by Webb in the early 1970s. The same could be said for his endlessly varied gold cuffs.

In Europe, many houses have given us gold jewelry that sets the highest standard for excellence, pieces that were highly sought after when they were made and continue to be so. 

Numerous designs from Cartier are homages to gold. There are the classic Trinity rings, necklaces and bracelets — trifectas of yellow, white and rose gold. As a testament to the power of love, consider the endurance of the Cartier Love bracelet.

Aldo Cipullo, Cartier’s top in-house designer from the late 1960s into the early ’70s, made history in 1969 with the Love bracelet. Cipullo frequently said that the Love bracelet was born of a sleepless night contemplating a love affair gone wrong and his realization that “the only remnants he possessed of the romance were memories.” He distilled the urge to keep a loved one close into a slim 18-karat gold bangle. 

BVLGARI and its coin jewelry, gemme nummarie, hit the jackpot when the line launched in the 1960s. The line has been perennially popular. BVLGARI coin jewelry features ancient Greek and Roman coins embedded in striking gold mounts, usually hung on thick link necklaces of varying lengths. In the 1970s, BVLGARI introduced the Tubogas line, most often made in yellow gold. The Tubogas watches are classics, and then there is the Serpenti, the house's outstanding snake-themed watches and bracelets.

A collection called Monete that incorporated the gold coins is one of several iconic BVLGARI lines that debuted in the 1970s and ’80s, catering to a new generation of empowered women. Just as designers like Halston and Yves Saint Laurent were popularizing fuss-free ready-to-wear fashion for women on the go, BVLGARI offered jewels to be lived in

Since Van Cleef Arpels opened its Place Vendôme doors in 1906, collection after collection of jewelry classics have enchanted the public. As predominantly expressed in a honeycomb of gold, there is the Ludo watch and accessories, circa the 1920s, and the golden Zip necklace, 1951, whose ingenious transformation of the traditional zipper was originally proposed by the Duchess of Windsor. Van Cleef's Alhambra, with its Moroccan motif, was introduced in 1968 and from the start its popularity pivoted on royalty and celebrity status. It remains one of VCA’s most popular and collected styles.

Mention must be made of Buccellati, whose name is synonymous with gold so finely spun that it suggests tapestry. The house’s many gold bracelets, typically embellished with a few or many diamonds, signified taste and distinction and are always in favor on the secondary market. Other important mid-20th-century houses known for their gold-themed jewelry include Hermès and Ilias Lalaounis.

Find a stunning collection of vintage and antique gold jewelry on 1stDibs.

The Legacy of Ruby in Jewelry Design

This deep red gem is the color of heat and passion — vintage and antique ruby jewelry is perfect for those born in the middle of summer.

Rubies are one of the few gemstones that can give diamonds a run for their money. Just consider the Van Cleef Arpels “scarf” necklace the Duke of Windsor presented to the Duchess on her 40th birthday, in 1936 — set with diamonds and dripping with rubies, a testament to the deep-red gemstone’s power — or the slippers encrusted with 4,600 rubies that Harry Winston made to commemorate The Wizard of Oz’s golden anniversary. July babies have permission to adorn themselves with this beautiful red stone even when it’s not their birthday.

Rubies are considered precious stones — along with diamonds, sapphires and emeralds — and have a hardness of 9.0 on the Mohs Scale, surpassed only by Moissanite and diamonds. They are composed of corundum, a colorless mineral that is also the basic material of sapphires. In the July birthstone, the red of the gemstone — and the various hues seen in sapphires — are produced by the presence of trace elements. In the case of a ruby, this element is chromium. Rubies range in color from vermilion to a violet red. They are also pleochroic, which means that a stone’s hue can vary depending on the direction of viewing. The most sought-after color is pigeon’s blood: pure red with a hint of blue.

Rubies that are hosted in dolomite marble are the most prized: Because the marble is low in iron, so are the rubies, resulting in a more intense color. Rubies found in basalt, which has a higher iron content, are generally darker and less intense.

When shopping for antique and vintage ruby jewelry, remember that the 4Cs of selecting the perfect diamond — color, clarity, cut and carat — also apply to rubies.

According to the Gemological Institute of America, the color of the July birthstone should be a vibrant to slightly purplish red, and the stone should be clear and inclusion-free. Accordingly, the cut should show off its color and clarity. As for the last criterion, fine rubies more than a carat in weight are rare. Often, large rubies are more expensive than diamonds of comparable weights.

Find a collection of ruby necklaces, ruby rings and other accessories on 1stDibs.