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Reversible Ruby and Paraiba Tourmaline Cross
By Zoltan David
Located in Austin, TX
Reversible cross - 18K gold on one side with pure 24K gold hand engraved shaped inlay in Zoltan
Category

2010s American Contemporary Pendant Necklaces

Materials

Diamond, Ruby, Tourmaline, White Diamond, Multi-gemstone, 18k Gold, 24k ...

Ruby Emerald and Sapphire Gold Cross Pendant
Located in Sydney CBD, AU
Beautiful multi-stone 18ct yellow gold cross pendant, Handmade 18ct yellow gold cross pendant
Category

21st Century and Contemporary Contemporary Pendant Necklaces

Materials

Emerald, Ruby, Sapphire, 18k Gold

Antique Onyx Ruby Emerald Gold Cross Pendant
Located in Naples, FL
18K Yellow Gold Antique Cross Pendant with Black Onyx, Three Cabochon Rubies and Three Cabochon
Category

Late 20th Century Unknown More Jewelry

Materials

Emerald, Ruby, 18k Gold

Byzantine Cross Pendant with Ruby and Diamonds
Located in Athens, GR
Our unique gold cross pendant blooms with a captivating flower design, where heart-shaped petals
Category

2010s Greek Byzantine Pendant Necklaces

Materials

Diamond, Ruby, Gold, 18k Gold

Byzantine Cross Pendant with Rubies and Sapphire
Located in Athens, GR
Our gold pendant showcases a captivating design with polygonal edges adorned by radiant rubies, all
Category

2010s Greek Byzantine Pendant Necklaces

Materials

Ruby, Sapphire, Gold, 18k Gold

Antique Ruby and Diamond Cross Panel Ring
Located in London, GB
with a calibré-cut ruby Greek cross motif, all within a millegrain border, to a plain 18ct yellow gold
Category

Early 20th Century British Edwardian Cocktail Rings

Materials

Diamond, White Diamond, Ruby, Gold, 18k Gold, Yellow Gold

Silver Ruby Criss Cross Bracelet
By Lane Crawford
Located in Fairfield, CT
Cross design simply expands to slide over your hand and then you just gently squeeze it onto your wrist
18 Karat White Gold Cross Ring Feature with Rubys
Located in Bari, IT
Very cute 18kt white Gold Cross Ring feauture with Rubys ct. 0,37. Size 12,5 Italian
Category

21st Century and Contemporary Modern Fashion Rings

Materials

Ruby, White Gold

Cross Pendant with Rubies and Pearls, Dimitrios Exclusive C7
Located in Athens, Peristeri
pendant with pearls and rubies and oxidation on the back side. A cross jewelry for any age inspired by the
Category

2010s Byzantine Pendant Necklaces

Materials

Pearl, Ruby, Gold Plate, Sterling Silver

Cross Pendant with Rubies and Pearls, Dimitrios Exclusive C8
Located in Athens, Peristeri
pendant with pearls and rubies and oxidation on the back side. A cross jewelry for any age inspired by the
Category

2010s Byzantine Pendant Necklaces

Materials

Pearl, Ruby, Gold Plate, Sterling Silver

Ruby Tourmaline Diamond Silver Gold Reversible Cross Ring
By Michael Barin
Located in Carmel by the Sea, CA
a unique flip mechanism. Depending on your mood, you can either wear this ring showcasing Rubies and
Category

2010s American Contemporary Fashion Rings

Materials

Diamond, Ruby, Tourmaline, White Diamond, 14k Gold, Rose Gold, Silver

Dimos 18k Gold Classic Cross with Rubies and Granulation
Located in Athens, GR
18k gold cross pendant with rubies and granulation decoration that combines elegance and religious
Category

Mid-20th Century Greek Classical Greek Pendant Necklaces

Materials

Ruby, 18k Gold, Yellow Gold

14 Karat Yellow Gold and Ruby Gothic Cross Pendant
By DRU.
Located in Los Angeles, CA
The 14k yellow fold and ruby Gothic Cross pendant is a striking addition to the jewelry lover's
Category

2010s American Gothic Revival Pendant Necklaces

Materials

Ruby, 14k Gold

Magnificent Vintage Untreated Sapphire Ruby Diamond Cross over Ring
Located in Napoli, IT
untreated Sapphire and Ruby no heat treatment approx 1.0 Ct the Sapphire .95 Ct the Ruby – stunning Royal
Category

Vintage 1940s Retro Cocktail Rings

Materials

Diamond, Ruby, Sapphire, 18k Gold

Early 20th Century Cross Pendant in Gold, Silver and Rubies
Located in Bosco Marengo, IT
Beautiful and characteristic antique cross pendant in silver with rubies. The back is in yellow
Category

Early 20th Century Italian Pendant Necklaces

Materials

Ruby, Gold, Silver

14.23 Carat Emerald Crosses with Diamonds and Ruby Charms Necklace
By Gorgoglione
Located in Milano, IT
7 Emerald Crosses enriched with Diamonds, Ruby and Sapphire Charms Necklace Hand-Made in Italy
Category

2010s Italian Contemporary Pendant Necklaces

Materials

Diamond, Emerald, Ruby, 18k Gold

Deakin Francis Sterling Pirate Crossed Daggers Ruby Spinel Skull Cufflinks
By Deakin Francis
Located in Lambertville, NJ
crossed daggers and skull head with movable jaws, revealing ruby eyes. Daggers decorated with black
Category

21st Century and Contemporary British Cufflinks

Materials

Ruby, Spinel, Sterling Silver

Deakin Francis Sterling Silver Skull and Cross Bones with Ruby Eyes
By Deakin Francis
Located in Birmingham, West Midlands
silver, skull and cross bone cufflinks. They feature striking ruby red eyes to dazzle the rest of the
Category

2010s European Contemporary Cufflinks

Materials

Ruby, Sterling Silver

14K Rose Gold Tourmaline, Ruby and Diamond Cross Flip Ring
By Michael Barin
Located in Granada Hills, CA
a unique flip mechanism. Depending on your mood, you can either wear this ring showcasing Rubies and
Category

21st Century and Contemporary American Art Deco Fashion Rings

Materials

Tourmaline, Diamond, Ruby, Silver, Rose Gold

Cross Grid, 18 Karat Yellow and White Gold, Ruby, Diamonds Pendant
By Maison Kwan
Located in Hong Kong, HK
Cross grid 8 Rubies (4.06cts), 28 Diamonds (0.471ct), 18K Yellow & White Gold. Length: 70mm An
Category

2010s Hong Kong Contemporary Pendant Necklaces

Materials

Diamond, White Diamond, Ruby, 18k Gold

Peridot Ruby and Sapphire Gold Cross on Chain
Located in Worcester, Worcestershire
. Some wear, fully hallmarked Peridot ruby & sapphire gold cross on chain.      
Category

20th Century Collectible Jewelry

Materials

Gold

Vintage Cartier Byzantine Cross Pin Pendant 18k Gold Diamonds Rubies Sapphires
By Cartier
Located in Houston, TX
This Vintage Cartier Byzantine gem-set cross is in excellent condition. -- Solid 18k yellow gold
Category

2010s French Byzantine Brooches

Materials

Diamond, Emerald, Ruby, Sapphire, Blue Sapphire, 18k Gold, Yellow Gold

Ruby Heart Pendant with White Diamond Band/Crossed Bones in 18 Karat Gold
By Blackisdiamond
Located in Nuevo Leon, MX
Stunning ruby heart pendant with white diamond band/crossed bones in white gold.
Category

21st Century and Contemporary More Necklaces

Materials

White Diamond, Ruby, White Gold

Paris Craft House 1.28ct Ruby Diamond Cross Pendant in 18 Karat Rose Gold
By Paris Precious Craft House
Located in Hong Kong, HK
PARIS Craft House 1.28ct Ruby Diamond Celtic Cross Pendant. - 4 Kite-cut Rubies/1.28ct - 82 Round
Category

21st Century and Contemporary Hong Kong Modern Pendant Necklaces

Materials

Diamond, White Diamond, Ruby, Gold, 18k Gold, Rose Gold

Cross-over 18 Carat Gold Bangle with Diamond, Ruby, Sapphire, English circa 1890
Located in London, GB
Late Victorian 18 carat gold tubular antique bangle of cross over design in the Russian style. Set
Category

Antique 1890s British High Victorian Bangles

Materials

Diamond, Ruby, Sapphire, 18k Gold, Gold, Yellow Gold

0.11 GVS Diamond 0.96 Pink Sapphire 0.95 Ruby 18 Karat White Gold Cross Necklace
By Federico Bellini
Located in Valenza, IT
Sophisticated cross with 42 centimeters chain in 18kt white gold for a grand total of 5,60 grams
Category

2010s Italian Modern Pendant Necklaces

Materials

White Diamond, Ruby, Pink Sapphire, 18k Gold

Cross Art Nouveau 0.46 Carat Round Cut Ruby 14 Karat Yellow Gold Pendant
By Fabio Ferrara
Located in Marcianise, IT
Cut Diamonds. This Pendant has 0.46 Carats of Round Cut Rubies. This Pendant is also available with
Category

Early 20th Century Italian Art Nouveau Pendant Necklaces

Materials

Diamond, Ruby, 14k Gold, Yellow Gold, Sterling Silver

Cross Art Nouveau 0.35 Carat Round Cut Ruby 14 Karat Yellow Gold Pendant
By Fabio Ferrara
Located in Marcianise, IT
Cut Diamonds. This Pendant has 0.35 Carats of Round Cut Rubies. This Pendant is also available with
Category

Early 20th Century Italian Art Nouveau Pendant Necklaces

Materials

Ruby, Diamond, 14k Gold, Yellow Gold, Sterling Silver

2.30 Carat 14 Karat Gold Cross with Diamond Emerald Sapphire and Ruby Necklace
Located in Sherman Oaks, CA
Gorgeous, Unique Cross Pendant w/ Bezel- and Flush-Set Precious Stones Matte Finish w/ Polished Dot
Category

2010s Pendant Necklaces

Materials

Blue Sapphire, 14k Gold, White Gold

Set of Three Cross Bands
Located in New York, NY
A set of three bands in 18k Yellow consisting of Diamond and Ruby, All Diamond and Diamond and
Category

Late 20th Century American Three-Stone Rings

Materials

Ruby, Diamond, Sapphire, 18k Gold

Dimos 18k Gold Byzantine Multicolor Cross
Located in Athens, GR
Byzantine cross in 18 karat yellow gold with a dynamic size. A variety of natural gems giving the
Category

2010s Greek Byzantine Pendant Necklaces

Materials

Ruby, Blue Sapphire, Diamond, 18k Gold

Dimos 18k Yellow Gold Classic Cocktail Cross
Located in Athens, GR
Classic cross completely handmade in the old traditional way in 18 karats gold set with round cut
Category

2010s Greek Byzantine Pendant Necklaces

Materials

Emerald, Ruby, Blue Sapphire, Yellow Gold

Taru Jewelry Cross and Shield Diamond Silver Necklace
Located in Boca Raton, FL
The cross necklace, with a centered ruby gemstone, praises your personal faith and your personal
Category

2010s American Contemporary Pendant Necklaces

Materials

Diamond, Ruby, Sterling Silver

Yoki Double Bypass Ruby Rose Gold Ring
By YOKI
Located in Annandale, VA
Limited-Edition Ring features Red Purplish Rubies - a cross over ring that is bold, daring and
Category

21st Century and Contemporary American Contemporary More Rings

Materials

Ruby, 18k Gold, Rose Gold

Women s 5 1/2 Platinum and 18 Karat Yellow Fleur di Lis Cross Signet Ring
By Thomas Kurilla
Located in New York, NY
Platinum and 18 Karat Yellow Fleur di Lis Cross Signet Ring, Tiffany designer , Thomas Kurilla
Category

2010s American Contemporary Signet Rings

Materials

Diamond, Emerald, Ruby, Sapphire, 18k Gold, Platinum

Boucheron 18 Karat Yellow Gold Ruby and Diamond Necklace
By Boucheron
Located in New York, NY
rubies and a diamond cross over. Classic box clasp with tongue and safety closure at the back. This
Category

Vintage 1960s French Retro Drop Necklaces

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

2.63 Carat Ruby and White Diamonds Red E-Coated Dangling Clip Earrings
By Gorgoglione
Located in Milano, IT
Diamonds and 1 Red Ruby E-Coated Cross The Earrings features 34 Rubies for 2.63 Carat total, and 36
Category

2010s Italian Contemporary Dangle Earrings

Materials

Ruby, White Diamond, 18k Gold

18K yellow gold Criss Cross Bangle. Oval brilliant faceted cut Amethyst
Located in Surfside, FL
Oval brilliant faceted cut Amethyst and Citrine with cabochon emeralds and rubies center, criss
Category

20th Century Bangles

Materials

Yellow Gold

18K Yellow Gold Criss Cross Bangle, Oval Brilliant Faceted Cut Amethyst
Located in Surfside, FL
Oval brilliant faceted cut Amethyst and Citrine with cabochon emeralds and rubies center, criss
Category

20th Century Bangles

Materials

Yellow Gold

18th Century Pair of Polychrome Candlesticks Table Lamps with Pigskin Shades
Located in Alella, ES
Ringed and fluted wooden standard over a molded tri-form plinth, genuine pigskin shades with cross
Category

Antique Late 18th Century Spanish Baroque Table Lamps

Materials

Giltwood

Victorian Ruby Cross Ring of 14k Gold
Located in Lewisburg, PA
Victorian Ruby Cross Ring in 14k Rose Gold with Enamel and Diamonds, Circa 1860 This magnificent
Category

Antique 1860s Victorian Fashion Rings

Materials

Diamond, Ruby, 14k Gold, Enamel

Antique Georgian Ruby Cross
Located in Montreal, QC
What an amazing, historic piece this is! An antique Georgian Cross handmade 9k yellow gold and set
Category

Antique Early 19th Century British Georgian More Necklaces

Materials

Ruby, 9k Gold

CARTIER Contemporary Ruby Cross Necklace
By Cartier
Located in Narberth, PA
A beautiful Estate cross necklace by legendary maker Cartier! The lovely piece is made of 18kt
Category

21st Century and Contemporary French Contemporary Drop Necklaces

Materials

Ruby, 18k Gold

LB Exclusive 14K Yellow Gold 0.02 Ct Diamond and Ruby Cross Necklace
By LB Exclusive
Located in Southampton, PA
This unique LB Exclusive 14K Yellow Gold 0.02 ct Diamond and Ruby Cross Necklace is made with a 14K
Category

21st Century and Contemporary More Necklaces

Materials

Diamond, Ruby, Yellow Gold

Pianegonda Silver and Ruby Cross Pendant Necklace
By Pianegonda
Located in Southampton, PA
hanging cross with a ruby pave.
Category

21st Century and Contemporary Pendant Necklaces

Materials

Ruby, Silver

Faye Kim 18k Gold Rosecut Ruby Cross Pendant
By Faye Kim
Located in Darien, CT
Handcrafted 18k gold granulation cross with faceted rose cut Ruby and granulation detail. Hidden
Category

21st Century and Contemporary Contemporary Pendant Necklaces

Materials

Ruby, 18k Gold

Boucheron 18 Karat White Gold Ruby Cross Pendant Necklace
By Boucheron
Located in Southampton, PA
Set in an elegant pendant that assumes the impressive form of a cross, charming rubies in this
Category

21st Century and Contemporary Pendant Necklaces

Materials

Ruby, White Gold, 18k Gold

Gothic Revival 18 Karat Yellow Gold Large Ruby Cross Pendant
Located in MIAMI, FL
cross accenting the ruby gemstones is black enamel adding a perfect combination of color contrast
Category

Vintage 1980s Italian Gothic Revival Pendant Necklaces

Materials

Ruby, Yellow Gold

Clarissa Bronfman Garnet, Onyx, Diamond, Silver, Ruby Cross Beaded Necklace
By Clarissa Bronfman
Located in New York, NY
. Silver and diamond clasp, allowing for pendant to be removed/interchanged. Ruby and Silver cross pendant
Category

21st Century and Contemporary Unknown Contemporary Beaded Necklaces

Materials

Diamond, Garnet, Onyx, Ruby, Gold Plate, Silver

14 Karat White Gold Diamond and Ruby Cross Pendant Necklace
By LB Exclusive
Located in Southampton, PA
This necklace is crafted from 14K white gold and set with rubies and with a 0.01ct diamond stone
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, White Gold

14 Karat Yellow Gold Diamond and Ruby Cross Pendant Necklace
By LB Exclusive
Located in Southampton, PA
This necklace is crafted from 14K yellow gold and set with rubies and with a 0.01ct diamond stone
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Yellow Gold

1.20ctw Diamond Ruby Cross Over Round Ring 14k Yellow Gold Size 7.25
Located in McLeansville, NC
Gemstone Information: - Natural Rubies - Total Carats - 1.08ctw Cut - Round Color - Red Treatment
Category

21st Century and Contemporary Fashion Rings

Materials

Diamond, Ruby, 14k Gold, Yellow Gold

Southern Cross 18K Yellow Gold 1.37 ct Diamond and Ruby Cross Pendant Necklace
By Non Branded
Located in Southampton, PA
This Southern Cross necklace is made of 18K yellow gold and embellished with diamonds and rubies
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Yellow Gold

LB Exclusive 14K White Gold 0.02 Ct Diamond and Ruby Cross Pendant Necklace
By LB Exclusive
Located in Southampton, PA
Shimmering gemstones make this cross pendant necklace undeniably stunning. The cross shaped pendant
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Ruby, White Gold

18 Karat Gold Old Mine Cut Diamond and Burma Rubies Cross Pendant Necklace
Located in Hong Kong, HK
rubies with a total carat weight of 1.32 cts that makeup this cross. These rubies glow under black light
Category

2010s Hong Kong Pendant Necklaces

Materials

Diamond, Ruby, White Diamond, Gold, 18k Gold, Rose Gold

LB Exclusive 18K Yellow and Rose Gold 0.85 Ct Diamond and Ruby Cross Necklace
By LB Exclusive
Located in Southampton, PA
cord, highlighting the stunning 18K yellow and rose gold cross pendant. The pendant is set with 0.85
Category

21st Century and Contemporary More Necklaces

Materials

Diamond, Ruby, Gold, Rose Gold

LB Exclusive 18 Karat White Gold 0.09 Carat Diamond and Ruby Cross Pendant
By LB Exclusive
Located in Southampton, PA
This LB Exclusive cross pendant is crafted from 18K white gold and weighs 2.6 grams. It measures
Category

21st Century and Contemporary More Jewelry

Materials

Diamond, White Gold

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Ruby Cross For Sale on 1stDibs

On 1stDibs, you can find the most appropriate ruby cross for your needs in our varied inventory. Every item for sale was constructed with extraordinary care, often using Gold, 18k Gold and Yellow Gold. You can easily find a 113 antique edition and 142 modern creations to choose from as well. You’re likely to find the perfect ruby cross 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 cross has been a part of the legacy of many jewelers, but those produced by Georgios Collections Inc, Cartier and LB Exclusive are consistently popular. A ruby cross can make for a versatile accessory, but a selection from our variety of 207 Ruby versions can add an especially stylish touch. 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. There aren’t many items for men if you’re seeking a ruby cross, as most of the options available are for women and unisex.

How Much is a Ruby Cross?

The price for a ruby cross starts at $99 and tops out at $180,000 with these necklaces, on average, selling for $2,647.

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.