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Siam Ruby

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Art Deco Illusion-Set Ruby and Diamond Cocktail Ring
Located in Khet Bang Rak, Krung Thep Maha Nakhon
illusion. Featuring a vivid tapestry of invisibly set rubies weighing a total of 6.10 carats, the dome
Category

2010s Thai Art Deco Dome Rings

Materials

Diamond, Ruby, 18k Gold

Platinum Rose Cut Diamonds and Ruby Butterfly Brooch
Located in Bangkok, TH
diamonds of 2.68 carats, full cut diamonds of 0.44 carats and 2 small cabochon rubies of 0.15 carats on the
Category

Early 2000s Thai Edwardian Brooches

Materials

Diamond, Ruby, Platinum

YI Collection Tanzanite Ruby Circa Ring in 18k
Located in New York, NY
tanzanite and ruby will bring some much needed color into your jewelry box. We love the contemporary and yet
Category

2010s Thai Modern Cocktail Rings

Materials

Ruby, Tanzanite, 18k Gold

Invisible set butterfly Ruby ring with a diamond
Located in Khet Bang Rak, Krung Thep Maha Nakhon
Butterfly ring made using natural hand picked rubies in mystery set making sure they are placed
Category

2010s Thai Arts and Crafts Cocktail Rings

Materials

Diamond, Ruby, 18k Gold

18K Rose Gold Ruby Diamond Channel-Set Band Ring
Located in Khet Bang Rak, Krung Thep Maha Nakhon
This elegant band ring features a captivating row of square-cut rubies, channel-set in luxurious
Category

2010s Thai Artisan Band Rings

Materials

Diamond, Ruby, Rose Gold

2.94 Carat Ruby and Diamond White Gold Earrings
Located in New York, NY
Gorgeous 2.23 carat pear shaped Rubies, suspended by 0.61 carat round Rubies. 0.45 carat, total
Category

21st Century and Contemporary Thai Modern Dangle Earrings

Materials

Diamond, Ruby, 18k Gold

Radiant Ruby Butterfly, a Stunning Diamond-Accented Pendant Necklace
Located in Bangkok, TH
Total diamond and ruby weight: 0.41ct Total weight (including Italian white gold chain): 2.67g
Category

2010s Thai Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold

Marquise princess illusion with double halo of ruby diamond
Located in Khet Bang Rak, Krung Thep Maha Nakhon
Circular design with Natural Ruby & diamond halo ring. This incredible Diamonds engagement ring
Category

2010s Thai Art Deco Cluster Rings

Materials

Diamond, Ruby, 18k Gold

Ruby and Diamonds Bracelet set in White Gold
Located in New York, NY
7.30 carat Rubies, alternating with 1.91 carat asscher cut diamonds, accented by 2.25 carat of
Category

21st Century and Contemporary Thai Modern Link Bracelets

Materials

Diamond, Ruby, 18k Gold

5.59 Carat Ruby Necklace Set in White Gold
Located in New York, NY
5.59 carat oval Rubies, alternating with round diamonds, surrounded by diamond halo. 1.20 carat
Category

21st Century and Contemporary Thai Modern Chain Necklaces

Materials

Diamond, Ruby, 18k Gold

4.26 Carat Ruby and Diamond White Gold Earrings
Located in New York, NY
Total Ruby weight: 4.26 carat Total Diamond weight: 0.55 carat Set in 18K White Gold Stunning
Category

21st Century and Contemporary Thai Modern Dangle Earrings

Materials

Diamond, Ruby, 18k Gold

Platinum Art Deco Inspired Ruby and Diamond Ring
Located in Bangkok, TH
A lovely platinum Art Deco inspired Ruby and Diamond ring featuring center rose-cut diamond of 0.65
Category

21st Century and Contemporary Thai Art Deco More Rings

Materials

Diamond, Ruby, Platinum

18 Karat Rose Gold and Burmese Ruby Ball Pendant
By Nancy Phillips
Located in Eugene, OR
Beautiful Burmese rubies are set in 18k Rose Gold in a classic ball pendant. There are 7.61cts of
Category

2010s Thai Contemporary Pendant Necklaces

Materials

Ruby, Rose Gold

4.15 Carat Ruby and Diamond White Gold Bracelet
Located in New York, NY
This bracelet features 12 round rubies, set in white gold, with a single diamond halo. Each ruby
Category

21st Century and Contemporary Thai Modern Link Bracelets

Materials

Diamond, Ruby, 18k Gold

1.93 Carat Ruby and Diamond White Gold Necklace
Located in New York, NY
1.93 carat pear shaped Ruby, embellished by 0.35 carat round white diamonds. Treat your special
Category

21st Century and Contemporary Thai Modern Drop Necklaces

Materials

Diamond, Ruby, 18k Gold

18kt White Gold Ruby Burst Pendant with Diamonds
By Kary Adam
Located in Seattle, WA
18kt White Gold Chain. Pendant Gold Weight alone is 3.36 Grams. This lovely Ruby burst pendant has a
Category

2010s Thai Contemporary Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold, White Gold

Invisible set Heart shape ruby Necklace in 18kt Rose gold
Located in Khet Bang Rak, Krung Thep Maha Nakhon
French cut natural rubies are used to make this adorable Ruby Necklace. 18kt Rose gold with 18mm
Category

2010s Thai Art Deco Pendant Necklaces

Materials

Ruby, Rose Gold

Elegant Ruby Diamond Halo Tennis Bracelet in White Gold
Located in Khet Bang Rak, Krung Thep Maha Nakhon
rubies, each surrounded by a delicate halo of sparkling diamonds. The elegant setting adds brilliance and
Category

2010s Thai Artisan Tennis Bracelets

Materials

Diamond, Ruby, 18k Gold, White Gold

Pearl Ruby and Moonstone Cabochon Gold Long Strand Necklace
Located in Bangkok, TH
Long Strand Necklace with Pearl, Ruby, and Cabochon Moonstone set in 18K Gold Setting Gold: 18K
Category

2010s Thai Beaded Necklaces

Materials

Moonstone, Pearl, Ruby, 18k Gold

Oval Ruby Diamond 18 Karat Gold Solitaire Ring
Located in New York, NY
Ring in 18 karat white gold set with an oval 7x5 mm vivid red Mozambique Ruby ( 1.18 carat) and
Category

2010s Thai Art Deco Solitaire Rings

Materials

Diamond, Ruby, 18k Gold

Ruby and Diamond Crossover Ring in 18 Karat Gold
Located in BANGKOK, TH
is crafted in - house by our master craftsmen in Thailand. Each stone is re - cut to make the rubies
Category

21st Century and Contemporary Thai Modern Cocktail Rings

Materials

Diamond, Ruby, Gold, 18k Gold

Heart shaped Invisible set Ruby along with diamond Necklace
Located in Khet Bang Rak, Krung Thep Maha Nakhon
Necklace made in 18kt Yellow gold with high quality natural rubies each handpicked of good quality
Category

2010s Thai Artist Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold

6.19 Carat Marquise Ruby Diamond 18 Karat Gold Bracelet
Located in New York, NY
Bracelet in 18 karat white gold set with 15 vivid red marquise cut Mozambique Rubies (6.19 carats
Category

2010s Thai Modern Link Bracelets

Materials

Diamond, Ruby, 18k Gold

18 Karat Classical 4 Letters Love Ruby Diamond Windmill Charm / Pendent
Located in Bangkok, TH
The windmill turns all obstacles into opportunities. and uses for good luck, longevity, health and prosperity to its owner, especially love.
Category

21st Century and Contemporary Thai Contemporary Charm Bracelets

Materials

Ruby

Ruby ring 1.85 cts withs white zircon
Located in Bangkok, TH
Ruby round 5 mm 1 pc Ruby roynd 4 mm. 2 pcs total 1.85 cts White zircon 1 mm. 52 pcs. White gold
Category

21st Century and Contemporary Thai Art Nouveau Three-Stone Rings

Materials

Ruby, Zircon, White Gold, Rhodium, Silver

Vintage 3.15 Carat Total Weight Ruby 14K Dome Ring
Located in Fuquay Varina, NC
A dome of rubies, 3.15ctw worth of stunning Thailand red rubies are stacked high and prong set in
Category

Mid-20th Century Thai Dome Rings

Materials

Ruby, 14k Gold, Yellow Gold

Ruby and Diamond Flower Earrings set in White Gold
Located in New York, NY
These stylish earrings feature 10 oval Rubies, 1.95 carat total weight. Surrounded by round
Category

21st Century and Contemporary Thai Modern Stud Earrings

Materials

Diamond, Ruby, 18k Gold

1.04 Carat Ruby and Diamond White Gold Cocktail Ring
Located in New York, NY
1.04 carat Ruby, surrounded by double halo round diamonds. Underneath the Ruby, there is a gallery
Category

21st Century and Contemporary Thai Modern Cocktail Rings

Materials

Diamond, Ruby, 18k Gold

Ruby Diamond Dual Tone Bracelet In 18 Karat Gold
Located in บางรัก, TH
Elements Combining our signature jewels with Diamonds, Rubies, and Gold gives this bracelet a
Category

2010s Thai Chain Bracelets

Materials

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

Ruby Diamond Dual Tone Bracelet In 18 Karat Gold
Located in บางรัก, TH
Elements Combining our signature jewels with Diamonds, Rubies, and Gold gives this bracelet a
Category

2010s Thai Chain Bracelets

Materials

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

1.43 Carat Ruby and Diamond White Gold Cocktail Ring
Located in New York, NY
Gorgeous 1.43 carat Oval Ruby, surrounded by a diamond halo. Total round diamond weight: 0.69
Category

21st Century and Contemporary Thai Modern Cocktail Rings

Materials

Diamond, Ruby, 18k Gold

0.95 Carat Ruby and Diamond White Gold Cocktail Ring
Located in New York, NY
Gorgeous 0.95 carat Oval Ruby, surrounded by a diamond halo. Total diamond weight: 0.63 carat
Category

21st Century and Contemporary Thai Modern Cocktail Rings

Materials

Diamond, Ruby, 18k Gold

1.95 Carat Ruby and Diamond White Gold Cocktail Ring
Located in New York, NY
This ring features a 1.95 carat round Ruby, that is surrounded by a double halo of round white
Category

21st Century and Contemporary Thai Modern Cocktail Rings

Materials

Diamond, Ruby, 18k Gold

Diamond Danglers with Scattered Rubies in 18 Karat Gold
Located in บางรัก, TH
Our Diamond Danglers with Scattered Rubies are a showstopper. These exquisite white diamond
Category

2010s Thai Dangle Earrings

Materials

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

Diamond Danglers with Scattered Rubies in 18 Karat Gold
Located in บางรัก, TH
Our Diamond Danglers with Scattered Rubies are a showstopper. These exquisite white diamond
Category

2010s Thai Dangle Earrings

Materials

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

Lithos 18K Yellow Gold Ruby and Diamond Ring
Located in Kirkwood, MO
Lithos 18K Yellow Gold Ruby and Diamond Ring. There is a 1.01 carat, natural ruby, prong set in the
Category

21st Century and Contemporary Thai Contemporary Cocktail Rings

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

Exquisite Emerald-Cut Diamond Ruby Halo Stud Earrings in 18K Gold
Located in Khet Bang Rak, Krung Thep Maha Nakhon
Exquisite Emerald-Cut Diamond & Ruby Halo Stud Earrings in 18K Gold Indulge in the ultimate
Category

2010s Thai Art Deco Stud Earrings

Materials

Diamond, Ruby, 18k Gold

18K White Gold Invisible-Set Ruby Diamond Floral Spring Bangle
Located in Khet Bang Rak, Krung Thep Maha Nakhon
of invisibly-set natural rubies shaped into a graceful flower, the piece is accented with a sparkling
Category

2010s Thai Art Deco Modern Bracelets

Materials

Diamond, Ruby, 18k Gold, White Gold

Neha Dani Mozambique Ruby and Diamonds on Titanium Scarlet Ring
By Neha Dani
Located in New York, NY
Carat Round Brilliant Cut Diamonds and 1.22 Carat Rubies. The deep red of a certified Oval Mozambique
Category

21st Century and Contemporary Thai Contemporary Cocktail Rings

Materials

Diamond, Ruby, Titanium

A Pressed Italian Glass and a Cultured Ruby Pendant set in Blackened Silver
By Kary Adam
Located in Seattle, WA
A Pressed Italian Glass and a Cultured Ruby Pendant set in Blackened Silver. The Cultured Ruby
Category

2010s Thai Classical Greek Pendant Necklaces

Materials

Ruby, Silver

Ruby and Diamond Hoop Earrings 18k Yellow Gold 1.75cttw
Located in Boca Raton, FL
Highlight your timeless beauty with this stunning pair of ruby and diamond earrings. These oval
Category

Vintage 1980s Thai Retro Hoop Earrings

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

18 Karat Yellow Gold Vintage Ruby and Diamond Bracelet
Located in Bangkok, TH
weight 36.40 grams and measuring 7.0 inches long, features 30 pieces of 8.94 carats oval rubies in total
Category

21st Century and Contemporary Thai Art Deco More Rings

Materials

Diamond, Ruby, 18k Gold

18 Karat White Gold Antique Ruby Bee Stud Earrings
Located in Bangkok, TH
beloved by that generation's interest in the natural world. The bee is set with rich red faceted ruby for
Category

Early 2000s Thai Edwardian Stud Earrings

Materials

Diamond, Ruby, Garnet, 18k Gold

2.34 Carat Ruby and Diamond White Gold Three-Stone Ring
Located in New York, NY
This ring features a 2.34 carat Emerald cut Ruby, set between two epaulet diamonds, 0.26 carat
Category

21st Century and Contemporary Thai Modern Three-Stone Rings

Materials

Diamond, Ruby, 18k Gold

1.96 Carat Ruby and Diamond White Gold Three-Stone Ring
Located in New York, NY
This ring features a gorgeous 1.96 carat Oval Ruby, set between two half moon diamonds, 0.30 carat
Category

21st Century and Contemporary Thai Modern Three-Stone Rings

Materials

Diamond, Ruby, 18k Gold

Baguette Ruby Diamond Dome Chandelier Earrings in 18K White Gold
Located in Bangkok, TH
Ruby Baguette Thread hanging from Diamond Pavé Dome Metal: 18K Gold Diamond: round brilliant, G
Category

2010s Thai Contemporary Chandelier Earrings

Materials

Diamond, Ruby, 18k Gold, Gold

Stunning 18 Karat Yellow Gold, Diamond and Ruby Ring
Located in Hong Kong, HK
Stunning 18 Karat Yellow Gold, Diamond And Ruby Ring. Diamonds of approximately 0.90 carats
Category

21st Century and Contemporary Thai Band Rings

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

18 Karat White Gold Ruby Diamond Umbrella Charm or Pendent
Located in Bangkok, TH
In the Orient, the umbrella represents the protection as a shield to the one who owns from the scorching heat, spiritual suffering and other harmful forces.
Category

21st Century and Contemporary Thai Contemporary Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold

1.50 Carat Ruby and Diamond White Gold Three-Stone Ring
Located in New York, NY
This gorgeous round 1.50 carat Ruby is set between two half moon diamonds, 0.21 carats. The ring is
Category

21st Century and Contemporary Thai Modern Engagement Rings

Materials

Diamond, Ruby, 18k Gold

Unheated Ruby Ring, 18k White Gold Diamonds Cocktail Ring
Located in Bangkok, TH
Queens Gambit Ruby Ring Royal Ruby Collection • 18k white gold. • Unheated Ruby in excellent
Category

2010s Thai Modern Cocktail Rings

Materials

Diamond, Ruby, 18k Gold, White Gold

18K Art Deco Invisible-Set Ruby Dome Ring with Marquise Diamond Cluster
Located in Khet Bang Rak, Krung Thep Maha Nakhon
karat white gold and showcases a mesmerizing composition of natural rubies in an invisible setting
Category

2010s Thai Art Deco Dome Rings

Materials

Diamond, Ruby, 18k Gold

Boon Berry 15.5 Carat Ruby, Emerald and Diamond Gold Brooch
By BOON
Located in Bangkok, TH
BOON Berry Ruby Emerald and Diamond Brooch in 18K Yellow Gold Length: 3.5cms. Gold: 18K Gold
Category

21st Century and Contemporary Thai Brooches

Materials

Diamond, Emerald, Ruby, Gold, 18k Gold

Diamond, Ruby, Sapphire Flame Earrings in 18k White Gold
By Zahira Fine Jewellery
Located in Bangkok, TH
These Diamond, Ruby and Sapphire Flame Earrings are masterfully designed and set in 18k white gold
Category

2010s Thai Modern Dangle Earrings

Materials

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

Ruby and Diamond Heart Shape Flip Ring in 18 Karat Gold
Located in BANGKOK, TH
A stunning 2-in-1 flip ring adorned with beautiful rubies on one side and diamonds on the other
Category

21st Century and Contemporary Thai Modern Cocktail Rings

Materials

Diamond, Ruby, Gold, 18k Gold

GEMCOOK JEWELLERY 2.13ct Unheated Pigeon Blood Ruby
Located in Bangkok, TH
pigeon blood from Mogok, Myanmar is a symbol of luxury and prestige. The ruby's rich and charming style
Category

2010s Thai Modern Solitaire Rings

Art Deco Inspired 18k Gold Pendant with Diamonds and Baguette Rubies
Located in ประเวศ, TH
features a flowing curve that frames a structured pattern of baguette-cut vivid pink rubies. Between them
Category

2010s Thai Art Deco Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold, Rose Gold

Yellow 18K Ring with White Diamonds and Rubies Flower Theme
Located in ประเวศ, TH
heart, radiating brilliance like the sun. Delicate ruby drops gracefully cascade from the center
Category

2010s Thai Cocktail Rings

Materials

White Diamond, Ruby, 18k Gold, Yellow Gold

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Siam Ruby For Sale on 1stDibs

Find the exact siam ruby you’re shopping for in the variety available on 1stDibs. Each design created in this style — which was crafted with great care and often made from Gold, 18k Gold and Platinum — can elevate any look. You can easily find a 28 antique edition and 23 modern creations to choose from as well. Finding the perfect siam ruby may mean sifting through those created during different time periods — you can find an early version that dates to the 19th Century and a newer variation that were made as recently as the 21st Century. For this particular piece, 1 Carat and 1.5 Carat are consistently popular carat weights. Creating a siam ruby has been a part of the legacy of many jewelers, but those produced by Andreoli, Avanti and Berca Atelier are consistently popular. See these pages for an oval cut iteration of this accessory, while there are also cushion cut cut and round cut cut versions available here, too. Finding a siam ruby for sale for women should be easy, but there are 18 pieces available to browse for unisex as well as men, too.

How Much is a Siam Ruby?

Prices for a siam ruby can differ depending upon size, time period and other attributes — at 1stDibs, these accessories begin at $575 and can go as high as $300,116, while this accessory, on average, fetches $12,201.

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.