Australian Opal Jewellery
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Faye Kim Lightning Ridge Australian Black Opal Hinged Ring in 18 Karat Gold
By Faye Kim
Located in Darien, CT
A captivating blend of artistry and modern refinement, Faye Kim's 18 Karat Gold Black Opal Hinge
Category
2010s American Contemporary Fashion Rings
Materials
Opal, Black Opal, Gold, 18k Gold
Vintage 3.87 Ct Australian Black Blue Green Opal Diamond Platinum ring
Located in Napoli, IT
standards
The real star is the center solid Black Opal with Green and Blue flashes on a dark body
Category
Vintage 1930s European Retro Solitaire Rings
Materials
Diamond, Black Opal, Platinum
Bluish Purple 0.60ct Round Australian Boulder Opal, Stackable Ring with Diamonds
By Kurtulan
Located in Bozeman, MT
Bluish Purple, 0.60ct Round Australian Boulder Opal, Stackable Ring with Diamond Detail, 24K Solid
Category
2010s Turkish Contemporary Fashion Rings
Materials
Diamond, Opal, Gold, 24k Gold, Yellow Gold
Yellow Gold Australian Opal Stud Earrings - 14k Oval Cab .60ctw Floral Pierced
Located in Greensboro, NC
Metal Content: 14k Yellow Gold
Stone Information
Natural Australian Opals
Carat(s): .60ctw
Cut
Category
21st Century and Contemporary Stud Earrings
Materials
Opal, 14k Gold, Yellow Gold
Yellow Gold Australian Opal Stud Earrings - 14k Oval Cab .90ctw Floral Pierced
Located in Greensboro, NC
Metal Content: 14k Yellow Gold
Stone Information
Natural Australian Opal
Carat(s): .90ctw
Cut
Category
21st Century and Contemporary Stud Earrings
Materials
Opal, 14k Gold, Yellow Gold
Twisted Band Round Australian Solid Opal Ring in 14K Yellow Gold
Located in Suwanee, GA
Twisted Band Round Australian Solid Opal Ring in 14K Yellow Gold.
Free Domestic USPS First Class
Category
2010s American Arts and Crafts Engagement Rings
Materials
Opal, 14k Gold, Yellow Gold
$438 Sale Price
20% Off
Minimalist Marquise Australian Solid Opal Engagement Ring in 14K Yellow Gold
Located in Suwanee, GA
Minimalist Marquise Australian Solid Opal Engagement Ring in 14K Yellow Gold.
Free Domestic USPS
Category
2010s American Arts and Crafts Engagement Rings
Materials
Opal, 14k Gold, Yellow Gold
$382 Sale Price
20% Off
Art Deco Inspired Hand Engraved Platinum Australian Opal Diamond Bridal Set
Located in Los Angeles, CA
Diamonds F-G Color VS2 Clarity 0.24-0.27 Carats, 2 Marquise Australian Opals, 3 x 6 MM.
Size- 4-12
Latest
Category
21st Century and Contemporary American Art Deco Engagement Rings
Materials
Diamond, Opal, Platinum
Minimalist Oval Natural Australian Doublet Opal Pendant Necklace 14k Yellow Gold
Located in Suwanee, GA
Oval Natural Australian Doublet Opal Pendant Necklace 14k Yellow Gold.
Free Domestic USPS First
Category
2010s American Arts and Crafts Pendant Necklaces
Materials
Opal, 14k Gold, Yellow Gold
$422 Sale Price
20% Off
Platinum Diamond GIA Certified 8.70 Carat Rare Australian Black Opal Ring
Located in Los Angeles, CA
lustrous Lightning Ridge Australian Black Opal cabochon surrounded by beautiful baguette diamonds in a
Category
21st Century and Contemporary American Art Deco Engagement Rings
Materials
Diamond, Black Opal, Platinum
ART DECO 1930 Cocktail Ring in Platinum with 6.12cts Australian Opal
Diamonds
Located in Miami, FL
An art deco ring with Australian opal.
Exceptionally beautiful ring, created during the iconic
Category
Vintage 1930s American Art Deco Cocktail Rings
Materials
Diamond, White Diamond, Opal, Black Opal, Platinum
Australian Opal and Diamond Castle Convertible Ring Pendant Charm 18k Gold
Located in Osprey, FL
♥ Solid 18k yellow gold castle pendant set with a beautiful doublet Australian Opal, diamonds, and
Category
2010s American Pendant Necklaces
Materials
Diamond, Opal, Gold, 18k Gold
GIA Antique Australian Opal 14K Pendant Natural Vintage Necklace Solid Gold Fine
Located in Sylvania, GA
Old South Jewels proudly presents GIA CERTIFIED ANTIQUE AUSTRALIAN OPAL VINTAGE 14K SOLID GOLD
Category
Antique 19th Century Pendant Necklaces
Materials
Opal, Gold, 14k Gold
Large Australian Opal Ring Cascading Waves Neon blue wedding gift special person
By Alexey Gabilo
Located in Berlin, DE
hand. An Australian neon blue opal sits in the center, encased by highly detailed, dimensional oceanic
Category
2010s French Art Nouveau Cocktail Rings
Materials
Opal, Silver, Sterling Silver
French 20th Century Australian Opal Diamonds 18 Karat Yellow Gold Ring
Located in Poitiers, FR
decorated on its top with an important Australian cabochon opal held with claws and surmounted on both sides
Category
Early 20th Century French Belle Époque Dome Rings
Materials
Diamond, White Diamond, Opal, Gold, 18k Gold, Yellow Gold
Delicate Oval Shaped Australian Solid Opal Stud Earrings 18K Yellow Gold
Located in Suwanee, GA
Delicate Oval Shaped Australian Solid Opal Stud Earrings 18K Yellow Gold.
Free Domestic USPS
Category
2010s American Arts and Crafts Stud Earrings
Materials
Opal, 18k Gold, Gold, Yellow Gold
$384 Sale Price / set
20% Off
Richard Klein Australian Opal Halo Slide Charm - Yellow Gold 14k Cab 1.10ctw
Located in Greensboro, NC
Natural Australian Opals
Carat(s): 1.10ctw
Cut: Oval Cabochon & Round Cabochon
Total Carats: 1.10ctw
Category
21st Century and Contemporary Charm Bracelets
Materials
Opal, 14k Gold, Yellow Gold
Australian Opal Pendant Set in 20 Karat Yellow Gold with Diamonds
By Coomi
Located in Secaucus, NJ
Affinity Opal Pendant Set In 20 Karat Yellow Gold with Open Close Bail and Multi-Size Blue Opals
Category
21st Century and Contemporary Thai Contemporary Pendant Necklaces
Materials
Diamond, Opal, Yellow Gold
Vintage 5.54ctw Australian OPAL
Round Baguette Diamond 14k Yellow Gold Ring
Located in New York, NY
Vintage 5.54ctw Australian OPAL
Round Baguette Diamond 14k Yellow Gold Ring.
Highly prized
Category
1990s Modern Cocktail Rings
Materials
Diamond, Opal, 14k Gold, Yellow Gold
11.32 Carat Australian Boulder Opal Diamond Sunburst 18k White Gold Ring
Located in Beverly Hills, CA
A superb platinum ring featuring a very fine Australian boulder opal. It weighs an impressive 11.32
Category
21st Century and Contemporary American Fashion Rings
Materials
Diamond, Opal, 18k Gold, White Gold
Oval Shaped Australian Doublet Opal Diamond Pendant Necklace 14k Yellow Gold
Located in Suwanee, GA
Minimalist Oval Shaped Australian Doublet Opal Diamond Pendant Necklace 14k Yellow Gold.
Free
Category
2010s American Arts and Crafts Pendant Necklaces
Materials
Diamond, Opal, 14k Gold, Yellow Gold, Gold
Golden Hill Turquoise
Australian Boulder Opal 18 Karat Gold Dangle Earrings
By Vicki Orr Designs
Located in Naples, FL
Golden Hill Turquoise from Kazakhstan and Australian Boulder Opal 18k yellow gold dangle earrings
Category
2010s American Contemporary Dangle Earrings
Materials
Multi-gemstone, Opal, Turquoise, Turquoise Matrix, Gold, 18k Gold, Yello...
Australian Opal 22k Gold Oval Framed Stud Earrings, Petra Class 2025
By Petra Class
Located in Dallas, TX
showcasing two gorgeous and fiery matched Australian opal doublets framed in the artist's signature-finished
Category
2010s American Artist Dangle Earrings
Materials
Opal, Gold, 18k Gold, 22k Gold, Yellow Gold, Mixed Metal
7.50 Carat Australian Oval Opal Diamond Halo Yellow Gold Cocktail Ring
Located in Stamford, CT
Beautiful Australian opal and diamond cocktail ring. Intricately designed and breathtakingly
Category
Late 20th Century Cocktail Rings
Materials
Diamond, Opal, Gold, 14k Gold, Yellow Gold
Crab Australian Doublet Opal
Diamond Eyes Pendant Necklace 14K Yellow Gold
Located in Suwanee, GA
Adorable Crab Australian Doublet Opal & Diamond Eyes 14K Yellow Gold Cancer Zodiac Pendant Necklace
Category
2010s American Arts and Crafts Pendant Necklaces
Materials
Opal, Diamond, Yellow Gold, 14k Gold
$606 Sale Price
20% Off
Yellow Gold Australian Opal Diamond Heart Pendant 18k Round Cabochon .31ctw Love
Located in Greensboro, NC
Metal Content: 18k Yellow Gold
Stone Information
Natural Australian Opal
Carat(s): .30ct
Cut
Category
21st Century and Contemporary Pendant Necklaces
Materials
Diamond, Opal, 18k Gold, Yellow Gold
35.23 Carat Australian Boulder Opal Tsavorite 18K Yellow Gold Cocktail Ring
Located in Beverly Hills, CA
A captivating opal, weighing 32.23 carats, forms the centerpiece of this contemporary ring. The
Category
21st Century and Contemporary American Contemporary Fashion Rings
Materials
Opal, Tsavorite, 18k Gold, Yellow Gold
Elegant Australian Boulder Opal Diamond Drop Earrings in 18K Yellow Gold
Located in Suwanee, GA
Elegant Australian Boulder Opal Diamond Drop Earrings in 18K Yellow Gold.
Free Domestic USPS
Category
2010s American Arts and Crafts Drop Earrings
Materials
Diamond, Opal, 18k Gold, Yellow Gold
$1,656 Sale Price / set
20% Off
Vintage 18K Gold
Palladium AGL Australian Black Opal Diamond Cocktail Ring
Located in Houston, TX
black opal:
Species: Natural Opal
Variety: Natural Black Opal
Geographic Origin: Australia
Measurements
Category
Late 20th Century Unknown Cocktail Rings
Materials
Diamond, Opal, Palladium, Yellow Gold, 18k Gold, Gold
$6,472 Sale Price
20% Off
1900s 5.82ct Authentic Antique Australian Opal and Diamond Cluster 18KYG Ring
Located in New York, NY
ring, Circa 1900.
This Crystal Australian opal displays electric play of color in a Oval shape. The
Category
Antique Early 1900s Victorian Cluster Rings
Materials
Diamond, Opal, 14k Gold, Yellow Gold
14K Rose Gold Small Oval Natural Australian Solid Opal Stud Earrings
Located in Suwanee, GA
14K Rose Gold Small Oval Natural Australian Solid Opal Stud Earrings.
Free Domestic USPS First
Category
2010s American Arts and Crafts Stud Earrings
Materials
Opal, 14k Gold, Rose Gold, Gold
$286 Sale Price
20% Off
Yellow Gold Australian Opal Vintage Cocktail Solitaire Ring -14k Oval Cab 3.08ct
Located in Greensboro, NC
Yellow Gold
Stone Information
Natural Australian Opal
Carat(s): 3.08ct
Cut: Oval Cabochon
Total Carats
Category
21st Century and Contemporary Solitaire Rings
Materials
Opal, 14k Gold, Yellow Gold
Handcraft 18 Karat Yellow Gold Diamonds Lapis Australian Opal Cocktail Ring
By SCALA GIOIELLI
Located in Marcianise, IT
Australian opal that reflects infinite shades of color that look like a rainbow.
Total weight of the ring 27
Category
Vintage 1980s Italian Retro Cocktail Rings
Materials
Diamond, Opal, 18k Gold, Yellow Gold
Minimal Style Oval Australian Doublet Opal Pendant Necklace 14k Yellow Gold
Located in Suwanee, GA
Minimal Style Oval Australian Doublet Opal Pendant Necklace 14k Yellow Gold.
Free Domestic USPS
Category
2010s American Arts and Crafts Pendant Necklaces
Materials
Opal, 14k Gold, Yellow Gold, Gold
$462 Sale Price
20% Off
Split Shank 18K Rose Gold Halo Diamond Australian Opal Engagement Ring
Located in Los Angeles, CA
Australian Opal Cabochon Cut 2.40-2.60 Carats 11 x 9 MM, 16 Round Diamonds, F-G Color VS2 Clarity 1.00 Carats
Category
2010s American Art Deco Engagement Rings
Materials
Diamond, Opal, 18k Gold, Rose Gold
Geometric Pear Shaped Australian Doublet Opal Engagement Ring 14K Yellow Gold
Located in Suwanee, GA
Geometric Pear Shaped Australian Doublet Opal Ring 14K Yellow Gold.
Free Domestic USPS First Class
Category
2010s American Arts and Crafts Engagement Rings
Materials
Opal, 14k Gold, Yellow Gold, Gold
$712 Sale Price
20% Off
Faye Kim 18 Karat Gold Diamond Halo Lightning Ridge Australian Black Opal Ring
By Faye Kim
Located in Darien, CT
Faye Kim's striking 18 Karat Gold Diamond Halo Lightning Ridge Australian Black Opal Ring marries
Category
2010s American Contemporary Cocktail Rings
Materials
Diamond, Opal, Black Opal, Gold, 18k Gold
Solid Australian Black Opal Heishi Bead Necklace 14k Gold Push Gate Clasp R4288
Located in Osprey, FL
♥ Solid Australian black Opal Heishi bead necklace with a 14k yellow gold push gate oval clasp
♥
Category
2010s American Chain Necklaces
Materials
Opal, Black Opal, Gold, 14k Gold
Small Minimalist Round Australian Doublet Opal Stud Earrings 14k Yellow Gold
Located in Suwanee, GA
Small Minimalist Round Australian Doublet Opal Stud Earrings 14k Yellow Gold.
Free Domestic USPS
Category
2010s American Arts and Crafts Stud Earrings
Materials
Opal, 14k Gold, Yellow Gold, Gold
$286 Sale Price
20% Off
Australian Opal Bangle Cuff with Diamonds in 18k White Gold / Platinum
Located in Carrollton, TX
Behold a true masterpiece of high jewelry—this exceptional collector’s quality cuff is an opulent
Category
2010s Unknown Contemporary Cuff Bracelets
Materials
Diamond, Opal, White Gold, Platinum, 18k Gold
$348,000 Sale Price
20% Off
2.28 Carat Australian Black Opal, Diamond Halo Cocktail Ring in 18k White Gold
By Sarosi By Timeless Gems
Located in Los Angeles, CA
fine jewelry wardrobe!
Ring size 5-3/4; complimentary sizing as needed
Australian Black Opal, 11.50
Category
21st Century and Contemporary North American Artisan Cocktail Rings
Materials
Diamond, Opal, Black Opal, White Diamond, Gold, 18k Gold, White Gold
Minimalist Black Agate Australian Solid Opal Stud Earrings 14K Yellow Gold
Located in Suwanee, GA
Minimalist Black Agate Australian Solid Opal Stud Earrings 14K Yellow Gold.
Free Domestic USPS
Category
2010s American Arts and Crafts Stud Earrings
Materials
Agate, Opal, Yellow Gold, Gold, 14k Gold
Minimalist Oval Shaped Australian Doublet Opal Pendant Necklace 14K Yellow Gold
Located in Suwanee, GA
Minimalist Oval Shaped Australian Doublet Opal Pendant Necklace 14K Yellow Gold.
Free Domestic
Category
2010s American Arts and Crafts Pendant Necklaces
Materials
Opal, 14k Gold, Yellow Gold, Gold
$488 Sale Price
20% Off
6.8 carats Australian Opal
Head Turner
18K Ring With Diamond and Sapphire
By Malpani Jewels
Located in Hung Hom, HK
Experience the epitome of elegance with this breathtaking 6.8-carat Australian Opal "Head Turner
Category
2010s Japanese Art Nouveau Cocktail Rings
Materials
Diamond, Opal, Sapphire, 18k Gold
1.27 Carat Australian Lightning Ridge Black Opal Ring Made in 18K Rose Gold
Located in Tokyo, JP
A beautiful ring featuring a 1.27 Carat, Natural, Australian Black Opal and 0.72 Carats of Diamond
Category
21st Century and Contemporary Japanese Modern Cocktail Rings
Materials
Diamond, Opal, Black Opal, Gold, 18k Gold, Rose Gold
Yellow Gold Australian Opal Halo Ring 10k Oval Cabochon
Round Cabochon 1.14ctw
Located in Greensboro, NC
Stone Information
Natural Australian Opal
Carat(s): 1.14ctw
Cut: Oval Cabochon & Round Cabochon
Total
Category
21st Century and Contemporary Cocktail Rings
Materials
Opal, 10k Gold, Yellow Gold
18K Yellow Gold Halo Diamond Marquise Turquoise Australian Opal Engagement Ring
Located in Los Angeles, CA
Australian Opal Cabochon Cut 12 x 10 MM 2.20-2.50 Carats, Four Marquise Turquoise, Two Round Opals, 30 Round
Category
2010s North American Art Deco Engagement Rings
Materials
Diamond, Opal, Turquoise, 18k Gold, Yellow Gold
Minimalist Three Stone Australian Doublet Opal Stud Earrings 14K Yellow Gold
Located in Suwanee, GA
Minimalist Three Stone Australian Doublet Opal Stud Earrings 14K Yellow Gold.
Free Domestic USPS
Category
2010s American Arts and Crafts Stud Earrings
Materials
Opal, Yellow Gold, Gold, 14k Gold
$374 Sale Price
20% Off
8.30 ct Australian Opal Mounted Cuff Accented With Diamonds And Multi Gemstone
By Artisan NYC
Located in New York, NY
This exceptional cuff bracelet highlights an 8.30ct Australian opal, enhanced by sparkling diamonds
Category
21st Century and Contemporary Indian Art Deco Cuff Bracelets
Materials
Emerald, Diamond, Multi-gemstone, Opal, 18k Gold
Simple Oval Natural Australian Solid Opal Stud Earrings 14K Yellow Gold
Located in Suwanee, GA
Simple Oval Natural Australian Solid Opal Stud Earrings 14K Yellow Gold.
Free Domestic USPS First
Category
2010s American Arts and Crafts Stud Earrings
Materials
Opal, 14k Gold, Yellow Gold, Gold
$390 Sale Price
20% Off
Twisted Band Oval Australian Solid Opal Ring in 14K Yellow Gold
Located in Suwanee, GA
Twisted Band Oval Australian Solid Opal Ring in 14K Yellow Gold.
Free Domestic USPS First Class
Category
2010s American Arts and Crafts Engagement Rings
Materials
Opal, Yellow Gold, 14k Gold, Gold
Multi Gemstone Australian Opal Earrings With Diamonds In 14k White Gold
By Artisan NYC
Located in New York, NY
14KT:10.905g,D:1.50ct, Emer:5.03ct,Opal:7.76ct,Sapp:5.67ct, 61X32
Category
21st Century and Contemporary Indian More Earrings
Materials
Emerald, Diamond, Multi-gemstone, Opal, 14k Gold, White Gold
4.20ct Natural Australian Opal and Diamond 14k Solid White Gold Ring
Located in Los Angeles, CA
4.20 Carats Natural Impressive Australian Opal and Diamond 14K Solid White Gold Ring
Suggested
Category
2010s American Cocktail Rings
Materials
Diamond, Opal, 14k Gold, White Gold
Handcraft Australian Opal 18 Karat White Gold Diamonds Emeralds Pendant Necklace
By SCALA GIOIELLI
Located in Marcianise, IT
with Australian opal,diamonds and emeralds
Pendant total weight 22 grams
Diamonds weight 1.16 karat
Category
21st Century and Contemporary Italian Artisan Pendant Necklaces
Materials
Diamond, Emerald, Opal, 18k Gold, White Gold
S Shaped Diamond Australian Opal Fossil Shell Necklace 18K Yellow Gold
Located in Suwanee, GA
S Shaped Diamond Australian Opal Fossil Shell Necklace 18K Yellow Gold.
Opalized Shell Fossil is
Category
2010s American Arts and Crafts Chain Necklaces
Materials
Diamond, Opal, 18k Gold, Yellow Gold, Gold
$1,534 Sale Price
20% Off
Australian Lightning Ridge Oval Opal 18 Karat White Gold Bypass Ring
Located in Houston, TX
This exquisite bypass ring features two captivating oval Opals weighing 1.37 carat total weight
Category
21st Century and Contemporary American Fashion Rings
Materials
Opal, Gold, 18k Gold, White Gold
Handcraft Australian Opal 18 Karat White Gold Peridot Citrine Pendant Necklace
By SCALA GIOIELLI
Located in Marcianise, IT
necklace. Handmade by our artisans assembled with peridot, yellow citrine and Australian opal
Pendant
Category
21st Century and Contemporary Italian Artisan Pendant Necklaces
Materials
Citrine, Opal, Peridot, 18k Gold, White Gold
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Australian Opal Jewellery For Sale on 1stDibs
Surely you’ll find the exact australian opal jewellery you’re seeking on 1stDibs — we’ve got a vast assortment for sale. Every item for sale was constructed with extraordinary care, often using Gold, 18k Gold and Yellow Gold. You can easily find a 153 antique edition and 537 modern creations to choose from as well. You’re likely to find the perfect australian opal jewellery among the distinctive items we have available, which includes versions made as long ago as the 19th Century as well as those produced as recently as the 21st Century. For this particular piece, .5 Carat and 1 Carat are consistently popular carat weights. Finding an appealing australian opal jewellery — no matter the origin — is easy, but Renata Bernard, Laura Dalben and SCALA GIOIELLI each produced a popular version that is worth a look. Today, if you’re looking for a cabochon version of this piece and are unable to find the perfect match, our selection also includes oval cut and mixed cut alternatives. Most of our australian opal jewellery for sale are for women, but there are 178 pieces available to browse for men.
How Much is an Australian Opal Jewellery?
The price for a australian opal jewellery starts at $312 and tops out at $340,949 with these rings, on average, selling for $5,320.
The Legacy of Opal in Jewelry Design
Opals were discovered in 400 BC, and since then five types have been found throughout the world. Before you start shopping for mysteriously beautiful vintage opal rings and other opal jewelry, learn about the different varieties of the gem — and find out which historical figure was reportedly willing to trade his kingdom for a single stone.
Here is a little riddle for you: the month of October has two birthstones, but only one of them encompasses the colors of other birthstones. If you guessed opal, you’re right! (The other gemstone associated with the month of October is tourmaline.)
Opals are such unusual gemstones that there are too many old-wives tales associated with them, like if you’re a blond, wearing an opal necklace will protect your locks from losing color. Opals were also very fashionable in the early 19th century, up until the publication of Sir Walter Scott’s novel Anne of Geierstein in 1829. The title heroine wears an opal and succumbs to an untimely death. However, the British monarchy, and in particular Queen Victoria, did not let this story get in their way, and they frequently gifted opals to friends and family members. October babies should disregard the noise and proudly wear their opals!
There are five types of precious opals: boulder opal, fire opal, crystal/water opal, black opal, and white/light opal. Each variety is distinguished by its color.
So, where does the name come from? The word opal is thought to originate from the Roman opalus or from the Sanskrit úpala (“precious stone”) or from the Greek opallios (“to see a color change”). So while there have been many names for the stones, opals were first discovered in 400 BC in Ethiopia. But the early reference that comes up most often in history books is from the Roman philosopher Pliny the Elder, who wrote about it in 75 AD. In his text he refers to it as opali. The Romans were big fans of opal, Mark Antony was so enamored by it that, as the story goes, he was willing to trade a portion of his kingdom for a single opal.
There's a wide variety of antique and vintage opal jewelry on 1stDibs (and you won't have to trade your kingdom for it).
Questions About Australian Opal Jewellery
- What is an Australian opal?1 Answer1stDibs ExpertNovember 2, 2021Today, Australia and Ethiopia are the two largest producers of opals. Historically, most of the world’s opals were mined in South Australia. The stone is so closely associated with Australia that in 1993 it became the national gemstone. There are five types of precious opals: boulder opal, fire opal, crystal/water opal, black opal, and white/light opal. Each variety is distinguished by its color. Shop a collection of vintage and modern Australian opal jewelry from some of the world’s top jewelers on 1stDibs.
- 1stDibs ExpertAugust 17, 2021An Australian boulder opal is an opal mined from a large ironstone boulder under the ground. This type of opal is the second most valuable opal behind the black opal. Spot an Australian boulder opal by checking for a solid layer of brown ironstone left on the back of the stone. Shop Australian boulder opals on 1stDibs.
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