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Cobalt Blue Titanium with Emeralds and Diamonds Earrings
By Paradizia
Located in Laguna Beach, CA
Description Avant-Garde, cobalt blue textured titanium discs adorned with an elegant design of
Category

21st Century and Contemporary American Artisan Drop Earrings

Materials

Diamond, Emerald, 14k Gold, Rhodium, Sterling Silver, Titanium

Cilea Paris Dangle Resin Clip Earrings Cobalt Blue Ribbons
By Ciléa
Located in Atlanta, GA
statement piece. Very nice cobalt blue with black contrast color. Marking underside of each earring: Cilea
Category

Early 2000s French Modern Dangle Earrings

Long Kyanite Silver Earrings Dark Cobalt Blue Color Translucent Nepali Gemstone
Located in Berlin, DE
Silver earrings with natural Kyanite kyanite origin - Nepal stones measurements - 0.12 х 0.16 х
Category

2010s German Artisan Drop Earrings

Materials

Kyanite, Silver

Francoise Montague by Cilea Resin Clip Earrings Dangle Cobalt Blue Hat
By Francoise Montague
Located in Atlanta, GA
oversized dangle design in shiny translucent cobalt blue resin in a hat-like shape. The hardware and
Category

Early 2000s French Modern Clip-on Earrings

18k Yellow Gold Earrings with Vintage Tiffany Favrile Cobalt Blue Glass Scarabs
Located in New York, NY
earrings feature a unique vintage Tiffany Favrile cobalt blue glass scarab set in the center of each
Category

21st Century and Contemporary American Clip-on Earrings

Materials

18k Gold, Yellow Gold

KJL Kenneth Jay Lane Gold Plated and Cobalt Blue Enamel Clip On Earrings
By Kenneth Jay Lane
Located in London, GB
Beautiful Kenneth Jay Lane gold plated earrings, featuring lovely cobalt blue enamel. Measuring
Category

Late 20th Century American Clip-on Earrings

Materials

Gold Plate, Enamel

Musula Jet Black Gothic Cobalt Soutache Earrings w/silver closure
By Musula
Located in Bilbao, ES
Jet Black Gothic XL Cobalt Blue Also in Rouge Red, Beige Marble, Copper Brown, Brown Wood, & Green
Category

21st Century and Contemporary Spanish Romantic Chandelier Earrings

Materials

Crystal, Silver

6.82 Carat Blue Sapphire and Diamond Dangle Earrings in Victorian Style
By Gems Paradise
Located in Jaipur, IN
cobalt blue sapphire and diamond long earring is incredible. The bottom graduating oval sapphires are
Category

2010s Indian Victorian Dangle Earrings

Materials

Diamond, Blue Sapphire, 14k Gold, Silver

Metallic Pink and Blue Sculptural Fold Drop Statement Earrings
Located in New York, NY
The Fold Earrings are sculptural folded earrings in vibrant metallic Fuchsia and Cobalt Blue. Their
Category

2010s Contemporary Drop Earrings

Materials

Sterling Silver

Metallic Blue and Green Sculptural Fold Drop Statement Earrings
Located in New York, NY
The Fold Earrings are sculptural folded earrings in vibrant metallic Cobalt Blue and Emerald Green
Category

2010s Contemporary Drop Earrings

Materials

Sterling Silver

18 Karat White Gold 64.57 Carat Blue Sapphire and Diamond Cocktail Drop Earrings
By Gems Paradise
Located in Jaipur, IN
cobalt blue sapphire and diamond long slice hanging earring is gorgeous. The solitaire irregular long
Category

2010s Indian Modern Drop Earrings

Materials

Diamond, Blue Sapphire, Gold, 18k Gold, White Gold

Art Deco Synthetic Blue Sapphire and Diamond Platinum Earrings
Located in OVIEDO, AS
cobalt center stone, deep blue with ever-changing flashes of light and dark These gorgeous drop earrings
Category

Vintage 1910s Spanish Art Deco Drop Earrings

Materials

Diamond, 18k Gold, Platinum

Michel McNabb for Basha Gold Large Blue Enamel Triangle Earrings
Located in Boca Raton, FL
uses a hydraulic press to form the shape from copper. A striking cobalt blue enamel has been applied
Category

21st Century and Contemporary American Artist Drop Earrings

Materials

Sterling Silver, Copper, Enamel

Chanel Blue Gripoix Gold Clip On Earrings
By Chanel
Located in Palm Beach, FL
Chanel Blue Gripoix Gold Clip On Earrings- excellent condition Cobalt blue gripoix round stone in
Category

Vintage 1980s French Clip-on Earrings

Antique Victorian Diamond lovers knot earrings, 15k gold and Blue enamel
Located in NEWARK, GB
enamelled in a rich cobalt blue enamel and this enamel can also be found at the back of the sphere, the
Category

Antique 19th Century British Victorian Dangle Earrings

Materials

Diamond, 15k Gold, Yellow Gold, Enamel

Tiffany & Co. Schlumberger 18K Gold Blue Enamel Dot Lozenge Clip On Earrings
By Jean Schlumberger for Tiffany & Co.
Located in Boca Raton, FL
for Tiffany & Co., these earrings feature a stunning shell like oval shape form with cobalt blue
Category

20th Century Unknown Art Deco Stud Earrings

Materials

18k Gold, Yellow Gold, Enamel

Cilea Japanese-Inspired Blue Resin Dangle Clip Earrings
By Ciléa
Located in Atlanta, GA
, watery purple, and iridescent cobalt blue. The designer's signature is on the underside of both earrings
Category

Early 2000s French Modern Clip-on Earrings

Aegean Blue Aurora Stud Earrings 18k White Gold with 1ct Diamonds & Enamel
Located in London, GB
entrance an onlooker. The sparkle of the diamond and the halo cobalt blue is like looking at the Aegean
Category

Mid-20th Century British Art Deco Stud Earrings

Materials

Diamond, White Gold, Enamel

Ungaro Paris, Art Nouveau Style Blue Resin Clip Earrings
By Emanuel Ungaro
Located in Atlanta, GA
-Nouveau-inspired design. The metal framing is topped with cobalt blue enamel and complimented with an
Category

1990s French Modern Clip-on Earrings

Materials

Gilt Metal

Monies Dangle Clip Earrings Ebony Wood and Blue Resin
By Monies Gerda Lynggaard
Located in Atlanta, GA
donut in transparent cobalt blue resin contrasted with Ebony wood drop element. Marked "Monies" on the
Category

Early 2000s Danish Modernist Clip-on Earrings

Francoise Montague Paris Blue Crystal and Pearls Dangle Clip Earrings
By Francoise Montague
Located in Atlanta, GA
shape style has a handmade double hoop design ornate with cobalt blue and baby blue crystal faceted
Category

Vintage 1980s French Modern Clip-on Earrings

Materials

Gilt Metal

Porcelain Earrings Marina
By FARPHORIA
Located in London, GB
lustrous blue cobalt glaze, these earrings exude sophistication and luxury. Every artichoke pentane is
Category

2010s British Romantic Dangle Earrings

Materials

Sterling Silver

Porcelain Earrings Marina
Porcelain Earrings Marina
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W 0.6 in D 0.6 in L 1.97 in
Mercedes Robirosa Style Gilt Metal Dangle Clip Earrings with Blue Cabochons
By Mercedes Robirosa
Located in Atlanta, GA
attention. Its gilt metal frame adds a touch of elegance and sophistication, while the cobalt blue Gripoix
Category

1990s French Modern Clip-on Earrings

Materials

Gilt Metal

Nautical Star Earrings
Located in New York, NY
Nautical inspired over sized earrings with huge matte stones in lipstick red and cobalt blue with
Category

Vintage 1980s American Dangle Earrings

Materials

Gilt Metal

Nautical Star Earrings
Nautical Star Earrings
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W 2 in L 3.5 in
Dominique Denaive Paris Blue and Gold Pearlized Resin Dangle Clip Earrings
By Dominique Denaive
Located in Atlanta, GA
elongated drop in a lovely semi-transparent color with cobalt blue and pearlized gold inclusions. Silver
Category

1990s French Modern Clip-on Earrings

Materials

Silver Plate

Sonia Rykiel Paris Clip Earrings Gilt Metal and Blue Crystal Rhinestone
By Sonia Rykiel
Located in Atlanta, GA
large and captivating cobalt blue crystal rhinestone. To authenticate the elegance and exclusivity of
Category

Vintage 1980s French Modern Clip-on Earrings

Materials

Gilt Metal

Blue Enamel and Diamond Tension Set Hoop Huggie Earrings 18k Yellow Gold
Located in beverly hills, CA
Stunning blue enamel and meticulous detail makes these earrings stand out. On one side, cobalt blue
Category

Late 20th Century Clip-on Earrings

Materials

Diamond, Yellow Gold, Enamel

Large Cabochon Ceylon Sapphire 16.73 Carat 0.50 Diamond Gold 1.75 Inch Earrings
By OGI Ltd
Located in New York, NY
mesmerizing cobalt blue tone, radiating elegance and sophistication. Accentuating the sapphire's brilliance
Category

2010s American Contemporary Hoop Earrings

Materials

Diamond, Sapphire, Blue Sapphire, Gold, 14k Gold, White Gold

Blueberry Azurite Geodes Diamonds Gold Earrings
By Karen Sugarman Designs
Located in Colleyville, TX
Magnificent cobalt blue azurite nodules, called blueberry geodes, are clearly the focal point of
Category

21st Century and Contemporary American Artisan Dangle Earrings

Materials

Diamond, 14k Gold

Blueberry Azurite Geodes Diamonds Gold Earrings
Blueberry Azurite Geodes Diamonds Gold Earrings
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W 1.875 in D 0.75 in
Dominique Denaive Paris Multicolor Resin Dangle Pierced Earrings
By Dominique Denaive
Located in Atlanta, GA
, saffron yellow, cobalt blue, and lemon yellow. The engraved signature is at the back of the earrings under
Category

Early 2000s French Modern Chandelier Earrings

Plique-à-jour Enamel Drop Earrings in 18K Gold
Located in Houston, TX
drops are cobalt blue plique-à-jour with round diamond accents. They measure 2 inches long and 5/8
Category

Vintage 1980s Italian Dangle Earrings

Materials

Diamond, Enamel, 18k Gold

Musula Passion Rouge Soutache Earrings w/silver closure
By Musula
Located in Bilbao, ES
Jet Black Gothic XL Marble Earrings. Also in, Brown Wood, Beige Marble, Cobalt Blue & Green
Category

21st Century and Contemporary Spanish Romantic Chandelier Earrings

Materials

Crystal, Hematite, Silver

Oversized Shoulder Duster Multicolor Waterfall Lucite and Glass Clip Earrings
Located in Atlanta, GA
assorted colors of cobalt blue, olive green, turquoise blue, purple, yellow copper, and red sienna colors
Category

Vintage 1980s American Artist Dangle Earrings

Musula Jet Black Gothic Uranium Soutache Earrings w/silver closure
By Musula
Located in Bilbao, ES
Jet Black Gothic Uranium Earrings Also in Rouge Red, Brown Wood, and Cobalt Blue Musula Soutache
Category

21st Century and Contemporary Spanish Romantic Chandelier Earrings

Materials

Crystal, Silver

Musula Jet Black Gothic Marble Soutache Earrings w/silver closure
By Musula
Located in Bilbao, ES
, Cobalt Blue & Green uranium Musula Soutache earrings made of rayon yarn 2mm, quartz stones and crystal
Category

21st Century and Contemporary Spanish Romantic Chandelier Earrings

Materials

Crystal, Silver

Musula Jet Black Gothic Wood Soutache Earrings w/silver closure
By Musula
Located in Bilbao, ES
Jet Black Gothic wood Earrings. Also in Rouge Red, Beige Marble, Copper Brown, Brown Wood, Cobalt
Category

21st Century and Contemporary Spanish Romantic Chandelier Earrings

Materials

Crystal, Silver

Axel Russmeyer Glass and Peridot Crystal Ball Earrings; See Other Colors, Sizes
By Axel Russmeyer
Located in New York, NY
CA0927 Hand beaded double ball earrings comprising cobalt blue glass beaded tops and cobalt blue white
Category

21st Century and Contemporary German Arts and Crafts Drop Earrings

Materials

Crystal, Other, 18k Gold, Other

Dusk to Dreams Sapphire and Purple Opal Gold Drop Earrings by NIXIN Jewelry
Located in Los Angeles, CA
blue, while the other dives deep into cobalt and green. Different, yet similar, these Boulder Opal
Category

2010s American Contemporary Drop Earrings

Materials

Opal, Sapphire, Gold, 14k Gold, Yellow Gold

Dusk to Dreams Sapphire and Purple Opal Gold Drop Earrings by NIXIN Jewelry
Dusk to Dreams Sapphire and Purple Opal Gold Drop Earrings by NIXIN Jewelry
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H 0.41 in W 0.35 in D 0.18 in L 1.5 in
Lapis Lazuli 18K Yellow Gold Earrings
Located in Beverly Hills, CA
One pair of pear-shaped lapis lazuli 18K yellow gold earrings featuring royal blue lapis stone
Category

Vintage 1960s Clip-on Earrings

Materials

Lapis Lazuli, 18k Gold, Yellow Gold

Lapis Lazuli 18K Yellow Gold Earrings
Lapis Lazuli 18K Yellow Gold Earrings
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W 1 in L 1.5 in
18 Karat Gold 43.67 Carat Diamond and Carved Ruby, Sapphire, and Emerald Earring
By Gems Paradise
Located in Jaipur, IN
fascinating mix of cobalt blue sapphire, crimson red ruby, tuscany yellow sapphire, parakeet emerald, and
Category

2010s Indian Contemporary Drop Earrings

Materials

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

1950s Trifari Boxed Lucite Hoop Earrings Set
By Trifari
Located in London, GB
, crimson, coral and cobalt blue enabling the wearer to change the colour of the outer shell when desired. A
Category

Vintage 1950s American Clip-on Earrings

1950s Trifari Boxed Lucite Hoop Earrings Set
1950s Trifari Boxed Lucite Hoop Earrings Set
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H 1.1 in Dm 1.1 in
Pop Art Multicolor Geometric Lucite Clip-on Earrings
Located in Atlanta, GA
with emerald green, green grass, hot pink, and cobalt blue colors with mirror effect and textured
Category

Vintage 1980s Italian Modern Clip-on Earrings

Tiffany & Company Schlumberger Gold Diamond and Enamel Shell Earrings
By Jean Schlumberger for Tiffany & Co.
Located in Chicago, IL
Cobalt Blue Enamel and set with Diamonds totaling .15 carat. The earrings measure 7/8 inch X 5/8 inch
Category

Early 2000s American Clip-on Earrings

Materials

Diamond, 18k Gold

Missoni Italy Gilt Metal Clip Earrings with Multicolor Iconic Smiling Face
By Missoni
Located in Atlanta, GA
is embellished with pale pink, turquoise, cobalt blue, yellow, and red enamel. Each earring is signed
Category

Vintage 1980s Italian Modern Clip-on Earrings

Materials

Gilt Metal

Signed Hobe Vintage Cobalt Blue and Light Blue Glass Bracelet and Earrings Set
By Hobé Jewelry
Located in Jacksonville, FL
elegance with this exquisite Hobe Vintage Cobalt Blue and Light Blue Glass Bracelet and Earrings Set
Category

20th Century American Art Deco Link Bracelets

Joseff of Hollywood 1950s Blue and Clear Crystal Brooch and Clip On Earrings Set
By Joseff of Hollywood
Located in London, GB
. Featuring dazzling cobalt blue marquise and round clear crystals. The brooch measures 11cm / 4.3 inches by
Category

Vintage 1950s American Brooches

18 Karat Yellow Gold Dome Ring with Blue and Green Enamel
By Cellini
Located in New York, NY
Cellini Jewelers NYC dome ring designed with swirls of cobalt blue and emerald green enamel
Category

1990s American Retro Dome Rings

Materials

Enamel, 18k Gold, Yellow Gold

Antique French Victorian Bracelet Earrings Brooch 18k Gold by Antoine Barrière
Located in Beverly Hills, CA
gold, and features cobalt blue enamel, opal and rose cut diamond. The whole antique set is masterfully
Category

Early 20th Century French Bangles

Materials

Diamond, Opal, 18k Gold, Yellow Gold

Italian 18K Yellow Gold Portrait Brooch/Pendant
Located in Palm Beach, FL
cobalt blue enamel frame inside a fancy gold outer frame. On the reverse side is a pin and a fold-down
Category

Mid-20th Century Italian Brooches

Materials

18k Gold, Yellow Gold

Italian 18K Yellow Gold Portrait Brooch/Pendant
Italian 18K Yellow Gold Portrait Brooch/Pendant
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W 1.38 in L 1.63 in
Cobalt Blue and Yellow Diamond Drop Earrings by Zoltan David
By Zoltan David
Located in Austin, TX
Our "Twisted Sister" earrings in a shimmering Cobalt Blue Zirconium Steel with .24 ct. total of
Category

2010s American Contemporary Drop Earrings

Materials

Yellow Diamond, 18k Gold, 24k Gold, Stainless Steel

Lapis Lazuli Drop Earrings Torpedo Vintage Gold Jewelry Cobalt Blue Modernist
Located in London, GB
The rich cobalt blue of these stylish earrings catches the eye beautifully, the lapis lazuli and
Category

Vintage 1960s Unknown Modernist Drop Earrings

Materials

Lapis Lazuli, 9k Gold

Marquise Moonstone Drop Earrings in Cobalt Blue Zirconium by Zoltan David
By Zoltan David
Located in Austin, TX
Another unique innovation for the savvy jewelry collector. The "Blue Moon" earrings. 2.70 ct. total
Category

2010s American Contemporary Drop Earrings

Materials

Diamond, Moonstone, Platinum, Stainless Steel

14 Carat Rose Gold and Silver Blue Briolette Enamel and Diamond Earrings
Located in Splitter's Creek, NSW
Guilloche Enamelling in bright Cobalt Blue, Silver & Diamond topped, suspended from a fluted golden backdrop
Category

2010s Unknown Modern Drop Earrings

Materials

Diamond, Rose Gold, Silver, Enamel

Handmade Laurel Leaf Dome Earring
By Ned Bowman / Bowman Originals
Located in Sarasota, FL
Sterling silver and 18k gold engraved "Button" style earrings accented with Cobalt blue enamel. The
Category

2010s American Artisan More Earrings

Materials

14k Gold, Sterling Silver, Enamel

Handmade Laurel Leaf Dome Earring
Handmade Laurel Leaf Dome Earring
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Dm 0.88 in
Youmna Fine Jewellery 18 Karat White Gold with Lapis, Agate, & Ruby Capri Ring
By Youmna Fine Jewellery
Located in Hong Kong, HK
is pleased to offer on 1stdibs the combination of deep cobalt blue lapis, white agate and glistening
Category

2010s Modern Cocktail Rings

Materials

Agate, Lapis Lazuli, Ruby, 18k Gold, White Gold

Philippe Ferrandis Vitrail Cobalt Blue Clip Earrings
By Philippe Ferrandis
Located in Virginia Beach, VA
process made famous by the House of GRIPOIX. Deep cobalt blue glass poured into a beautiful setting in 24
Category

2010s French Modern Clip-on Earrings

Van Cleef & Arpels Cobalt Enamel Diamond Gold Clipback Earrings
By Van Cleef & Arpels
Located in Miami, FL
approximately 0.53cttw, E-F color, VVS clarity, prong set, complemented by cobalt blue French enamel. Featuring
Category

Vintage 1970s French Clip-on Earrings

Materials

Diamond, 18k Gold

Francoise Montague by Cilea Paris Blue Poppy Resin Clip Earrings
By Francoise Montague
Located in Atlanta, GA
assorted palette of cobalt blue and periwinkle blue. No visible maker's mark. Measurements: 1.07 in
Category

Early 2000s French Romantic Clip-on Earrings

French Artisan Designer GHIS clip on Earrings Charcoal Resin Blue Rhinestone
Located in Atlanta, GA
silver grey resin material topped with large cobalt blue and clear rhinestones. Signature engraved on
Category

21st Century and Contemporary French Chandelier Earrings

1960s Italian Oversized Pop Art Dangling Electric Blue Lucite Clip-on Earrings
Located in Atlanta, GA
cobalt blue rhinestones. Total eye catching Pop Art statement piece. Excellent vintage condition
Category

Vintage 1960s Italian Chandelier Earrings

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Cobalt Blue Earrings For Sale on 1stDibs

On 1stDibs, there are many options to choose from in our inventory of cobalt blue earrings. All of the items for sale were constructed with extraordinary care, often using Gold, 18k Gold and Enamel. Our selection of items includes 20 vintage examples as well as 3 contemporary versions. Our collection, which features older pieces for sale from the 20th Century and newer versions made as recently as the 21st Century, has proven very popular over the years. Pieces in our collection of cobalt blue earrings made by Modernist jewelers — as well as those associated with Contemporary — are very popular. Many examples in our inventory of these items are appealing no matter their origins, but Dominique Renée, Guy Laroche and Harriet Bauknight for KASO produced popular versions that are worth a look. Many pieces in our collection are stylish for most occasions, but Diamond versions, from our inventory of 2, can add a particularly distinctive touch to your look, day or night. Today, if you’re looking for oval cut cobalt blue earrings and are unable to find the perfect match, our selection also includes pear cut and round cut alternatives. There aren’t many items for men in our collection of cobalt blue earrings, as most of the options available are for women.

How Much are Cobalt Blue Earrings?

On average, cobalt blue earrings at 1stDibs sell for $523, while they’re typically $165 on the low end and $15,600 for the highest priced versions of this item.

Finding the Right Earrings for You

In the United States, ear piercing didn’t really become popular until the 1950s and ‘60s, but our desire for a dazzling pair of vintage earrings has deeper roots than that. In fact, wearing earrings actually goes back thousands of years, and you can find many tangible connections between now and then in how we continue to talk about these treasured accessories.

Women wore ornamental earrings — studs and hoops at the very least — in Ancient Egypt, which is home to mines that are among the earliest sources of emeralds in the world. Emerald earrings are highly prized today, and their quality lies in their rich, saturated color. The highest-quality emeralds are green or bluish-green. Earrings worn by the affluent in early Roman civilizations were set with precious stones such as diamonds and pearls, and a clean-looking pop of pearl on the front of the lobe is as timeless as ever. Hoop earrings are imbued with symbolism and cultural significance for many, and on view in the Metropolitan Museum of Art’s Ancient Near Eastern Art Gallery is a pair of simple gold hoops from Mesopotamia dating to between 2600 and 2500 B.C.

Today, ear piercing is very popular all over the world, and, as a result, it is difficult to overstate how much everyone pines for a good pair of earrings — modernist drop earrings, glamorous Victorian hoops, geometrically complex chandelier earrings, you name it. Sure, jewelry trends and the fashion darlings of social media come and go, but earrings have a staying power that seems impenetrable: The still-strong love affair between British royals and Cartier earrings is more than a century old, glossy 1970s hoops from legacy houses such as Bulgari and Van Cleef & Arpels remain the statement makers they’ve always been and although people have been stacking earrings for many moons, the allure of an expertly mismatched stack of charms and studs still feels fresh and new.

While there is no shortage of modern earring designs to choose from, the classics, like coral earrings, Art Deco–style earrings and diamond drop earrings are still heavy hitters. On 1stDibs, find a wide range of antique, new and vintage earrings today.

Questions About Cobalt Blue Earrings
  • 1stDibs ExpertApril 5, 2022
    No, not all blue glass is cobalt glass. Only those made with cobalt oxide can be called cobalt. In some pieces, the presence of copper oxide accounts for the color, however, cobalt glass is much more common. You'll find a collection of cobalt glass on 1stDibs.
  • 1stDibs ExpertApril 5, 2022
    Yes, cobalt oxide makes glass blue. Different amounts of cobalt can be used to create more saturated levels of blue or to simply neutralize yellow for a more clear finish. Copper oxide can also be used to create a blue tinted glass. Shop a collection of cobalt glass from some of the world’s top sellers on 1stDibs.
  • 1stDibs ExpertApril 5, 2022
    How old cobalt glass is varies greatly. Ancient Mesopotamian examples exist from roughly 2000 BC. In China, cobalt glass became common during the Zhou Dynasty, which lasted from 1122 to 221 BC. European cobalt glass may date back to as early as the 15th century. Shop a collection of antique cobalt glass on 1stDibs.
  • 1stDibs ExpertApril 5, 2022
    If your glass has a blue tint to it, it is likely cobalt blue glass. There are three shades of cobalt glass; dark cobalt, which has a slight purplish hue, light or cornflower blue and medium blue. To verify its authenticity, check with an appraiser. You can also shop a collection of cobalt blue glass from some of the world’s top sellers on 1stDibs.
  • 1stDibs ExpertApril 5, 2022
    Cobalt blue glass is a deep blue glass that often gets its color by the addition of cobalt oxide in the molten glass mixture when the glass is being formed. The best way to identify cobalt blue glass is by the color. Shop a collection of cobalt blue glass from some of the world’s top sellers on 1stDibs.