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Fine Edwardian Platinum Diamond Ruby Crossover Toi et Moi Ring, C 1900
Located in Firenze, IT
set with an old cut diamond and a natural, non-treated, bright red ruby in a cross-over design, the
Category

Antique Early 1900s European Edwardian Engagement Rings

Materials

Diamond, Ruby, Platinum

19th Century Ruby Diamonds 18 Karat Yellow Gold Silver Band Ring
Located in Poitiers, FR
brilliant- cut diamond and 4 round rubies, the whole forming a cross. An openwork silver decoration set with
Category

Antique Early 19th Century French Empire Band Rings

Materials

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

Fendi Vintage Gripoix Logo F Crown Crest Maltese Cross Cabochon Chunky Brooch
By Fendi
Located in Wokingham, England
Fendi Vintage 1980s Gripoix Logo F Fendista Crown Crest Maltese Cross Cabochon Ruby Emerald Lapis
Category

Vintage 1980s Italian Art Deco Brooches

Materials

Gold Plate

Gavello Vintage Diamond Sword Pendant in Gold
By Gavello
Located in London, England
blade, with ruby accent cross guard and an onyx handle and pommel. The sword is suspended from a trace
Category

2010s Greek Pendant Necklaces

Materials

Diamond, Onyx, Ruby, 18k Gold

Christian Lacroix Vintage Orange Enamel Heart Crystals Dangle Tear Drop Brooch
By Christian Lacroix
Located in Wokingham, England
Christian Lacroix Vintage Unisex Baroque Orange Enamel Heart Ruby Red Black Crystals Small Cross
Category

Vintage 1980s French Art Deco Brooches

Materials

Gold Plate

19th Century French Madonna Religious Gold Crown Jewelled Santos Crown Life Size
By Van Cleef Arpels, Cartier
Located in Wommelgem, VAN
: Antique French Victorian Jewelled Religious Santos crown. With on top a cross bejewelled with ruby
Category

Antique Late 19th Century French Baroque Religious Items

Materials

Gold Plate, Brass

Karl Lagerfeld Vintage Gold Toned Sautoir Necklace
By Karl Lagerfeld
Located in Nice, FR
KARL LAGERFELD vintage gold toned sautoir necklace featuring large ruby glass beads, KL monogram
Category

20th Century French Chain Necklaces

Theo Fennell Lief Collection 18k Ruby Cross
By Theo Fennell
Located in Beverly Hills, CA
Theo Fennell Lief Collection Ruby Cross Dimensions: 1" by half inch Cross Chain: 18k Yellow Gold
Category

2010s English Pendant Necklaces

Materials

Ruby, 18k Gold, Yellow Gold

3.50ct Natural Ruby Cross Pendant 14kt Channel Baguette
Located in New York, NY
Natural Baguette Rubies Cross. Natural 3.50ct Rubies Brilliant Baguette, full cuts clean clarity
Category

2010s American Pendant Necklaces

Materials

Ruby, 14k Gold, Yellow Gold

Antique Victorian 18ct Split Pearl Ruby Cross Ring
Located in London, GB
Our unique early Victorian ring features a ruby cross alongside natural split pearls, all set in an
Category

Antique 19th Century English Victorian Cluster Rings

Materials

Pearl, Ruby, 18k Gold

Antique Victorian 18k Yellow Gold Burmese Ruby Cross Ring
Located in Great Neck, NY
Beautiful Antique Victorian 18K Yellow Gold Burmese Ruby Cross Ring - Size 4 3/4. This beautiful
Category

Antique 1880s Unknown Victorian Cocktail Rings

Materials

Ruby, Yellow Gold

1900 Ruby Cross Gold Pendant
Located in Napoli, NA
An Antique 12k rose Gold and silver Cross, it features 11 brilliant-cut round Natural Rubies
Category

Early 20th Century Italian Late Victorian Pendant Necklaces

Materials

Ruby, 14k Gold, Silver

24.70 Carat Natural Ruby Cross Necklace and Yard 18 Karat Rosary Prayer Novena
Located in New York, NY
Rosary Novena Reds. 24.50ct. Natural Ruby Cross necklace. Cross consists of 9.50ct emerald cut
Category

2010s American Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

Ruby Cross Etruscan Revival Ring Antique Victorian 14 Karat Gold Chalcedony
Located in New York, NY
A gorgeous Antique Ring in the Etruscan Revival style with a Ruby Cross motif in the center set on
Category

Antique 19th Century Unknown Victorian Fashion Rings

Materials

Chalcedony, Pearl, Ruby, 14k Gold, Rose Gold, Gold

Chanel Renaissance Ruby Cross Pendant Brooch
By Chanel
Located in New York, NY
Exceptional ruby pate de verre glass Renaissance cross brooch/pendant by Karl Lagerfeld for Chanel
Category

1990s French Brooches

Ruby Cross Necklace Engraved Astrology Symbols White Diamond Jesus Medal
By J DAUPHIN
Located in Los Angeles, CA
Ruby Cross Necklace Engraved Astrology Symbols White Diamond Jesus Medal Material: Cross is in
Category

2010s American Contemporary Chain Necklaces

Materials

White Diamond, Ruby, Gold Plate, Silver, Sterling Silver, Bronze

Cartier Contemporary Ruby Cross Necklace in Platinum
By Cartier
Located in Los Angeles, CA
A beautiful Estate cross necklace by legendary maker Cartier! The lovely piece is made of platinum
Category

21st Century and Contemporary French Contemporary Pendant Necklaces

Materials

Ruby, Platinum

18k Yellow Gold and Platinum Ruby Cross
Located in Hicksville, NY
Metal Type: 18K Yellow Gold and Platinum [Hallmarked, and Tested] Weight: 19.4 grams Center Ruby
Category

Early 2000s Unknown Contemporary Pendant Necklaces

Antique Georgian Spanish Ruby Cross Pendant, circa 1780
Located in Stamford, CT
A rare example of Spanish jewelry, this magnificent ruby 18 Kt gold cross, with substantial and
Category

Antique 1780s Spanish George III Pendant Necklaces

Materials

Ruby, 18k Gold

Tiffany Co. 18K Yellow Gold Elsa Perreti Ruby Cross Necklace
By Tiffany Co.
Located in New York, NY
Brand Tiffany & Co Mint condition 18K Yellow Gold Dimension: 13x17mm Ruby: 11 round White
Category

21st Century and Contemporary Pendant Necklaces

Materials

Ruby, 18k Gold, Yellow Gold

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, Ruby, White Gold, 14k Gold

18K Yellow Gold Diamond and Ruby Cross Pendant Locket, circa 1860s
Located in Idar-Oberstein, DE
A very beautiful and finely crafted locket pendant with a cross motive, in 18k yellow gold, ca
Category

Antique Mid-18th Century French Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold, Enamel

7.00ct.Natural Fancy color brown diamond vivid red ruby cross necklace 14k
Located in New York, NY
5.50ct. Natural Ruby & 1.50ct Fancy color brown diamond cross. Emerald cut fancy color brown
Category

2010s American Pendant Necklaces

Materials

Brown Diamond, Ruby, 14k Gold, Yellow Gold

Antique 18 Karat Yellow Gold Ruby Cross Earrings with Diamond Dangle
Located in Coral Gables, FL
Antique 18 Karat Yellow Gold Earrings Featuring 10 Round Rubies Totaling Approximately 0.50 Carats
Category

Antique Late 19th Century Dangle Earrings

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

Georgios Collection 18 Karat Gold Ruby Cross with Diamonds and Granulation work
By Georgios Collections Inc
Located in Astoria, NY
S.Georgios Byzantine Style Cross is handmade from solid 18 Karat Yellow Gold and features a Ruby
Category

2010s Greek Byzantine Necklace Enhancers

Materials

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

Georgios Collection 18 Karat Gold Sapphire and Ruby Cross with Granulation work
By Georgios Collections Inc
Located in Astoria, NY
S.Georgios Byzantine Style Cross is handmade from solid 18 Karat Yellow Gold and features 4 Pear
Category

2010s Greek Byzantine Necklace Enhancers

Materials

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

Georgios Collection 18 Karat Gold Sapphire and Ruby Cross with Granulation work
By Georgios Collections Inc
Located in Astoria, NY
S.Georgios Byzantine Style Cross is handmade from solid 18 Karat Yellow Gold and features 4 Pear
Category

2010s Greek Byzantine Necklace Enhancers

Materials

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

Georgios Collection 18 Karat Gold Ruby Cross with Diamonds and Granulation Work
By Georgios Collections Inc
Located in Astoria, NY
S.Georgios Byzantine Style Cross is handmade from solid 18 Karat Yellow Gold and features a Ruby
Category

21st Century and Contemporary Greek Byzantine Necklace Enhancers

Materials

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

Georgios Collection 18 Karat Gold Sapphire and Ruby Cross with Granulation work
By Georgios Collections Inc
Located in Astoria, NY
S.Georgios Byzantine Style Cross is handmade from solid 18 Karat Yellow Gold and features 4 Pear
Category

21st Century and Contemporary Greek Byzantine Necklace Enhancers

Materials

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

18 Karat Old Mine Cut Diamond and Burma Rubies Cross Pendant Drop Necklace
Located in Hong Kong, HK
rubies with a total carat weight of 1.5 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, White Gold

LB Exclusive 14 Karat Gold 0.01 Carat Diamond and Ruby Cross Pendant Necklace
By LB Exclusive
Located in Southampton, PA
” chain and a cross pendant that measures 0.60” in length and 0.37” in width. The necklace is embellished
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Rose Gold

18 Karat Rose Gold, Antique Old Mine Cut Diamond and Burma Rubies Cross Pendant
Located in Hong Kong, HK
rubies with a total carat weight of 1.53cts 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

Ruby Diamond Yellow Gold Cross Necklace
Located in Montgomery, AL
This ruby cross necklace is an estate piece. The pendant is 14k gold and features 5 pear cut rubies
Category

Late 20th Century Pendant Necklaces

Materials

Diamond, Ruby, 14k Gold, Yellow Gold

Ruby and Diamond Sterling and Enamel Cuff Bracelet
Located in Nantucket, MA
diamonds. 4.94 ct of diamonds, 2.40 ct of rubies. Cross hatch design covers entire bracelet, push clasp
Category

20th Century Indian Cuff Bracelets

Materials

Diamond, Ruby, Sterling Silver, Enamel

Large pearl and ruby pendant 14KT baroque pearl pendant cross
Located in Boca Raton, FL
Baroque natural pearl with ruby cross pendant, this piece is made with quality not glued but rather
Category

21st Century and Contemporary Pendant Necklaces

Materials

Pearl, Ruby, 14k Gold

Ruby-Diamond Cross
Located in Bad Kissingen, DE
18 k white gold hallmarked with fineness 750 6 ruby together 1,27 ct diamonds together 0,27 ct
Category

21st Century and Contemporary German Pendant Necklaces

Materials

18k Gold

Renaissance Ruby Diamond Cross Pendant c1580
Located in Chicago, IL
An Exceptionally Rare Ruby, Diamond and Gold Cross Pendant Renaissance, circa 1580 The
Category

Antique Early 19th Century Georgian Drop Necklaces

Materials

Diamond, Ruby

White Gold Ruby Diamond Cross Necklace
Located in Guaynabo, PR
This is a White Gold Ruby Diamond Cross Necklace. It depicts a 585 white gold chain necklace
Category

20th Century Unknown Modern Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold, White Gold

Ruby Diamonds and Gold Cross Pendant Charm
Located in Monte Carlo, MC
Elegant cross Pendant made of marquise shaped rubies and a princess cut diamond in its center
Category

Late 20th Century Modern Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold

Rare 18th century ruby and diamond cross.
Located in Aspen, CO
Very early table and rose cut diamonds and rubies are set in closed back 18K gold. This cross is
Category

Antique 18th Century Unknown Georgian Drop Necklaces

Materials

Diamond, Ruby, 18k Gold

Georgian Ruby Diamond Silver Gold Cross Pendant
Located in Idar-Oberstein, DE
A Georgian Ruby and Diamond Cross Pendant. This very pretty pendant from the Georgian period
Category

Antique Late 18th Century Unknown Georgian Drop Necklaces

Materials

Diamond, Ruby, Gold, Silver

Georgian Gold Ruby and Pearl Cross Pendant
Located in Banbury, GB
A superb Georgian Italian gold ruby and seed pearl cross pendant, set with graduated creamy natural
Category

Antique 18th Century British Georgian Pendant Necklaces

Materials

Pearl, Ruby, Gold, 18k Gold

Georgian Gold Ruby and Pearl Cross Pendant
Located in Banbury, GB
A superb Georgian Italian gold ruby and seed pearl cross pendant, set with graduated creamy natural
Category

Antique 18th Century British Georgian Pendant Necklaces

Materials

Pearl, Ruby, Gold, 18k Gold

Alternating Ruby and Diamond Cross Pendant Necklace
By Roman Malakov
Located in New York, NY
cross design. Rubies weigh 0.34 carats total; diamonds weigh 0.08 carats total. Made in 18 karat white
Category

21st Century and Contemporary American Contemporary Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold, White Gold

Ruby and Diamond Yellow Gold Cross Pendant Estate
Located in Miami, FL
Cross Pendant Estate - crafted to perfection with 14K Yellow Gold and headlined by dazzling Rubies, plus
Category

2010s Modern Pendant Necklaces

Materials

Diamond, Ruby, Yellow Gold, Gold, 14k Gold

Antique 14 karat Rose Gold Ruby German Cross
Located in Esch sur Alzette, Esch-sur-Alzette
The Antique 14 karat Ruby German Cross is a captivating and historically rich religious pendant
Category

20th Century German Artisan Pendant Necklaces

Materials

Ruby, 14k Gold, Rose Gold

Sapphire Ruby Emerald Cross GIA Certified Diamond 14kt
Located in New York, NY
Multi-Gem Cross 4.62ct Round Brilliant Natural Blue, Yellow, Orange, Pink Sapphires Emerald
Category

2010s American Pendant Necklaces

Materials

Diamond, Emerald, Ruby, Sapphire, 14k Gold, White Gold

Fei Liu 1.76ct Ruby and Diamond Platinum Cross Pendant
By Fei Liu
Located in Birmingham, GB
This exquisite pendant necklace showcases a harmonious cross motif, where five vivid rubies — four
Category

21st Century and Contemporary British Contemporary Pendant Necklaces

Materials

Diamond, White Diamond, Ruby, Platinum

14 Karat Yellow Gold Ruby and Diamond Cross
By Gregory Mikaelian Sons, Inc.
Located in Los Angeles, CA
14k yellow gold 4 baguette rubies weighing .60pts. and 1 round full cut diamond weighing .09pts. on
Category

Early 2000s American Artisan Drop Necklaces

Materials

Diamond, Ruby, 14k Gold

Rubies, Diamonds, Rose Gold and Silver Cross Pendant.
Located in Marcianise, Marcianise (CE)
, ITEMS AT AUCTIONS AND ONGOING PROMOTIONS. Cross pendant in 9 kt rose gold and silver structure studded
Category

Vintage 1970s Italian Retro Pendant Necklaces

Materials

Diamond, Ruby, 9k Gold, Rose Gold, Silver

14 Karat Yellow Gold Ruby and Diamond Cross Pendant
Located in Washington Depot, CT
14 Karat Yellow Gold Ruby and Diamond Cross Pendant- This lovely cross features one marquis ruby
Category

20th Century Pendant Necklaces

Materials

Diamond, Ruby, Yellow Gold

Chanel Byzantine Maltese Cross Ruby Necklace
By Chanel
Located in New York, NY
Chanel Byzantine style pale pink ruby collet set pate de verre poured glass necklace by Maison
Category

1990s French Byzantine Link Necklaces

Materials

Gold Plate, Bronze, Gilt Metal

Victorian Rose Cut Diamond Ruby Silver Gold Cross Pendant
Located in South Pasadena, CA
Victorian rose-cut diamond ruby silver and gold cross pendant circa 1890. Clear and concise
Category

Antique 1890s Victorian Pendant Necklaces

Materials

Diamond, Ruby, Gold, Silver

Diamond Ruby Old Cut Gold Silver Cross Pendant
Located in Bad Kissingen, DE
- 925 Silver, partially gold-plated - Numerous old-cut diamonds - Dimensions: approx. 60 x 50 mm - Weight: approx. 19 gram Additional information The dimensions are approx. 60 x 50...
Category

Antique 1880s Unknown Classical Greek Pendant Necklaces

Materials

Diamond, Ruby, Silver

Dangling Earring Cross Pendant Statement Ruby Silver J Dauphin
By J DAUPHIN
Located in Los Angeles, CA
Dangling Earring Cross Pendant Statement Ruby Silver J Dauphin J DAUPHIN statement Earring
Category

2010s American Contemporary Dangle Earrings

Materials

Ruby, Sterling Silver, Silver

Swiss Cross Rescue Dog Ruby Gold and Platinum Brooch
Located in Geneva, CH
Swiss cross Rescue Dog. Ruby, Gold and Platinum Brooch. Circa 1970. French marks. Total length
Category

Vintage 1970s French Arts and Crafts Brooches

Materials

Ruby, 18k Gold, Platinum

David Webb Azurmalachite, Ruby and Diamond Maltese Cross Brooch
By David Webb
Located in Weston, MA
This stylized Maltese Cross from David Webb is composed of four reeded azurmalachite elements
Category

20th Century American Brooches

Materials

Diamond, Ruby, 18k Gold, Platinum

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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.