12mm Opal
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Art Nouveau Genuine Opal Cabochon and Rhinestone Drop Screwback Earrings, 1940s
Located in Tucson, AZ
punctuated by a perfect 12 mm opal cabochon. Petite yet statement-making and thoroughly mesmerizing
Category
Vintage 1940s Unknown Art Nouveau Drop Earrings
Materials
Opal, Base Metal
Free Shipping
W 0.63 in D 0.38 in L 1.13 in
Dalben Rough Amber and Australian Opal Necklace
By Laura Dalben
Located in Como, IT
mm , opals 11-7 mm .
Category
21st Century and Contemporary Italian Contemporary Beaded Necklaces
Materials
Amber, Opal, 18k Gold, Rose Gold
Antique French Opal and Diamond Ring
Located in London, GB
: 1.8 grams
Size: J (49)
Face Dimensions: 13.5mm x 12mm
Opal: 1 (8mm x 5mm x 2mm)
Diamonds: Approx. 0.08
Category
Antique Early 1900s Art Nouveau Fashion Rings
Materials
Diamond, Opal, Gold, Yellow Gold
White Opal and Diamond Abstract Ring
Located in London, GB
Dimensions: 15mm x 12mm
Opal: Approx. 0.78ct
Diamond: 2mm
Marked: '750' i.e. 18ct
Box: The Vintage Jeweller
Category
Late 20th Century Fashion Rings
Materials
Diamond, Opal, Gold, White Gold, Yellow Gold
Boulder Opal and Diamond Abstract Ring
Located in London, GB
.
Condition: Used (Very Good)
Weight: 6.0 grams
Size: M (53)
Resizable: Yes
Face Dimensions: 14mm x 12mm
Opal
Category
20th Century Fashion Rings
Materials
Diamond, Opal, 18k Gold, Yellow Gold
Black Opal Yellow Gold Stud Earrings Natural Blue Opal Australian
Located in Berlin, DE
- 0.16 x 0.2 x 0.47 in / 4 х 5 х 12 mm
Opal weight - 3.25 carats
earrings weight - 4.4 grams
We ship
Category
2010s German Artisan Stud Earrings
Materials
Opal, Black Opal, Yellow Gold
H 0.48 in W 0.2 in D 0.16 in L 0.48 in
Ethiopian Opal Pair total 5 ct 12 mm x 10 mm AAA+ Great Fire Create your Earring
Located in Viena, Viena
this pair of very fine Ethiopian opal cabochons can be a amazing jewelry, 2 opal with 12 x 10 mm
Category
2010s Modern Loose Gemstones
Materials
Opal
Free Shipping
W 0.48 in D 0.16 in L 0.4 in
Magnificent Australian Loose Black Boulder Opal of 5.50ct. 19mm x 12mm x 4mm.
Located in MELBOURNE, AU
This Australian Loose Boulder Opal is
of impressive 5.50ct (19mm x 12mm x 4mm)
from Winton
Category
Vintage 1980s Australian Loose Gemstones
Materials
Opal
Free Shipping
W 0.48 in D 0.16 in L 0.75 in
Blue Boulder Opal ring Avatar Unisex natural opal ring Genuine opal jewelry
Located in Berlin, DE
weight of the opal - 7.10 carat
weight of the ring - 12.47 grams
opal - 0.24 х 0.47 x 0.55 in / 6 х 12 х
Category
2010s German Artisan Cocktail Rings
Materials
Opal, Silver
Opal and Diamond Brooch
Located in Palm Beach, FL
12 x 16 mm, within 12 brilliant-cut diamonds, mounted in 14 karat yellow gold, gross weight
Category
20th Century Brooches
Materials
Diamond, Opal
Natural Opal Ring
Located in Vadgam, GJ
Grams
Gemstone - Natural Opal
Total stone weight - 1.10 carat
Stone shape - Round
Stone size - 8 x 8 mm
Category
21st Century and Contemporary Indian Artisan Wedding Rings
Materials
Opal, Sterling Silver
Floral Opal Ring
Located in Vadgam, GJ
Grams
Gemstone - Natural Opal
Total stone weight - 1.20 carat
Stone shape - Round
Stone size - 8 x 8 mm
Category
21st Century and Contemporary Indian Art Nouveau Cocktail Rings
Materials
Opal, Sterling Silver
Boulder Opal Silver Ring Natural Australian 6ct Gemstone opal jewelry
Located in Berlin, DE
0.47 x 0.59 in / 3 х 12 х 15 mm
opal weight - 6.20 carats
ring size - 8 1/4 US
ring weight - 8.5 grams
Category
2010s German Artisan Cocktail Rings
Materials
Opal, Silver
Boulder Opal Silver Ring Australian Opal Wedding Anniversary Statement Ring
Located in Berlin, DE
- Australia
opal measurements - 0.31 x 0.47 in / 8 х 12 mm
ring weight - 7.6 grams
ring size - 8 1/4 US
ref
Category
2010s German Art Deco Cocktail Rings
Materials
Opal, Gold Plate, Silver
5.6 carat Opal lot (12 pieces)
Located in Ciudad De México, MX
Lot of Loose Gemstones (12 pieces)
5.60 Carat in total
Cabochon cut stones
Fire Opal
Different
Category
2010s Mexican Loose Gemstones
Materials
Opal, Fire Opal
Edwardian Opal Diamond Cluster Ring in 3.5 Carat Opal
Located in Kendal, GB
: ...
Category
20th Century Edwardian Cluster Rings
Materials
Diamond, Opal, White Gold
Two Tone Semi Black Opal & Fire Opal Tsavorite Diamond Necklace 18K Yellow Gold
Located in Suwanee, GA
Opal: 0.135 ct
1 Diamonds: 0.07 ct
12 Tsavorite Garnet: 0.219 ct
Blue Black Opal Body Tone: N8
Blue
Category
2010s American Artist Pendant Necklaces
Materials
Diamond, Opal, Tsavorite, Black Opal, Fire Opal, 18k Gold, Yellow Gold
Free Shipping
H 0.95 in W 0.26 in
Boulder Opal Gold Ring Engagement fantasy style Elf Australian opal
By Alexey Gabilo
Located in Berlin, DE
opal origin - Australia
opal measurements - 0.16 х 0.31 х 0.47 in / 4 х 8 х 12 mm
stone weight - 3.80
Category
2010s French Artisan Fashion Rings
Materials
Opal, 14k Gold, Yellow Gold
Opal World no.1 (10K, Australian Precious Opal Pendant) by Ken Fury
By Ken Fury
Located in Queens, NY
Overall size: 29 mm x 12 mm
Hand-signed
Includes an 18-inch 10K solid yellow gold chain.
Category
2010s American Contemporary Pendant Necklaces
Materials
Opal, 10k Gold
14 Karat Black Opal and Diamond Pendant
Located in Washington Depot, CT
opal (12 mm x 9 mm) and two baguette diamonds set in classic 18K yellow gold.
*Chain not included
Category
20th Century Pendant Necklaces
Materials
Diamond, Opal, Black Opal, Yellow Gold
Brutalist 14K Black Opal Cocktail Ring
Located in Philadelphia, PA
.**
Condition: Very good
Ring size: 8 1/2 US
Opal: 12mm x 10mm
Ring face: 22mm x 16mm
Band: 2.5mm +/-
Weight
Category
Late 20th Century Cocktail Rings
Materials
Opal, Black Opal, 14k Gold, Yellow Gold
18K Opal Diamond Halo Ring
By Rose and Choc
Located in Wallingford, CT
Oval Australian opal set in diamonds
Metal: 18K Yellow Gold
Stone: Australian Opal
Stone Shape
Category
2010s American Contemporary Cocktail Rings
Materials
Diamond, Opal, 18k Gold
Platinum 2.03ct Diamond and Opal Ring
By LB Exclusive
Located in Southampton, PA
A breathtaking orange-hued 7.19 carat opal is surrounded by a halo of diamonds totaling 2.03 carats
Category
21st Century and Contemporary Band Rings
Materials
Diamond, Opal, Platinum
Sterling Silver Link & Black Matrix Opal Choker Necklace
Located in Philadelphia, PA
grams
Gemstone Measurements:
Opal Cabochon: ca. 12 mm x 9 mm x 8 mm
Items purchased from this dealer
Category
20th Century Artisan Link Necklaces
Materials
Opal, Black Opal, Sterling Silver
Goshwara Opal Cabochon And Diamond Earrings
By Goshwara
Located in New York, NY
: 26.09 Carats (Opal)
Diamonds: G-H / VS, Approx Wt: 2.79 Carats
Stone Size: 12 x 16 mm, 13 x 18 mm
Category
21st Century and Contemporary American Contemporary More Earrings
Materials
Opal, Diamond, 18k Gold
Vintage Opal and Diamond Cluster Ring
Located in London, GB
Good)
Weight: 4.1 grams
Size: N 1/2 (54)
Face Dimensions: 12mm x 11mm
Opal: Approx. 0.60 carats
Total
Category
20th Century Victorian Cluster Rings
Materials
Diamond, Opal, Gold, Yellow Gold
White Opal and Diamond Abstract Ring
Located in London, GB
Dimensions: 12mm x 8mm
Opal: Approx. 0.70 carats
Diamonds: 6 (1mm)
Marked: '750' i.e. 18ct
Box: The Vintage
Category
21st Century and Contemporary Fashion Rings
Materials
Diamond, Opal, Gold, Yellow Gold
Estate Cabochon Fire Opal 14K Yellow Gold Ring
Located in New York, NY
health.
Opal: measuring 12mm by 9mm by 5mm, beautiful lively color
Condition:Very Good
Size: 4.5 US
Marks
Category
20th Century Unknown Cocktail Rings
Materials
Opal, Fire Opal, 14k Gold, Yellow Gold
Antique Victorian Opal Diamond Gold Bangle Bracelet
Located in Miami, FL
, measuring 12 mm approximately, 6 carats in total.
(40) Natural genuine old mine diamonds enrich this
Category
Antique Early 1900s Late Victorian Bangles
Materials
Diamond, Opal, Gold
Dalben Australian Boulder Opal Rose Gold Earrings
By Laura Dalben
Located in Como, IT
set Australian Boulder Opals weighing 12 carats.
max width 16 mm
height without leverback 34 mm
Category
21st Century and Contemporary Italian Contemporary Dangle Earrings
Materials
Opal, Gold, 18k Gold, Rose Gold
Vintage Edwardian Natural Opal Pin 14kt Pendant 12368
By Unbranded
Located in New York, NY
Vintage Opal Pin
1.20ct natural opals
Dangling Pearl 6 x 5mm
14kt yellow gold 12.9 grams
48 x 22mm
Category
21st Century and Contemporary Edwardian Brooches
Materials
Opal, Pearl, 14k Gold
Platinum 0.30ct Diamond and Opal Ring MF23-021324
By LB Exclusive
Located in Southampton, PA
A captivating 3.40 carat fiery orange opal gemstone serves as a stunning focal point on this
Category
21st Century and Contemporary Band Rings
Materials
Diamond, Opal, Platinum
Black Opal Yellow Gold Pendant Navy Blue Unisex Jewelry
Located in Berlin, DE
measurements - 0.2 х 0.47 х 0.71 in / 5 х 12 х 18 mm
opal weight - 8.40 carats
pendant length - 1.02 in / 26 mm
Category
2010s Artisan Pendant Necklaces
Materials
Opal, Black Opal, Gold, 18k Gold, Yellow Gold
Free Shipping
H 1.02 in W 0.47 in D 0.2 in L 0.71 in
Opal Diamond Earrings in 14k Yellow Gold
Located in Honolulu, HI
Opal: 2
Opal Total Carat Weight: 1.64 carats
Diamonds: 12
Diamond Color: I
Diamond Clarity: I1
Category
21st Century and Contemporary Czech Modern Stud Earrings
Materials
Diamond, Opal, 14k Gold, Yellow Gold
Dalben Australian Boulder Opal Yellow Gold Dangle Earrings
By Oreste Dalben
Located in Como, IT
- green bezel set Australian Boulder Opals weighing 9,6 carats.
max width 11-12 mm
height without
Category
21st Century and Contemporary Italian Contemporary Dangle Earrings
Materials
Opal, 18k Gold, Yellow Gold
Fire Opal Birthstone Pendant in 18 Karat Yellow Gold
By VR Jewels
Located in Houston, TX
> Gemstone - Opal
> Stone Weight - 7.1 ct
> Stone pieces - 1
> Stone Size - 16 x 12 mm
> Stone Shape - Oval
Category
21st Century and Contemporary American Modern Pendant Necklaces
Materials
Opal, Fire Opal, Yellow Gold, 18k Gold
18 Karat Yellow Gold Opal Cluster Ring
Located in Los Angeles, CA
Thickness: 1.30 mm
Specifications:
main stone: OPAL STONE 3.36MM
diamonds: 12 PCS
brand: custom
Category
21st Century and Contemporary American Contemporary Cluster Rings
Materials
Opal, 18k Gold, Yellow Gold
18kt gold pendant necklace featuring three tear-drop-shaped fire opals
Located in Braintree, GB
Fire Opals -
Shape: teardrop
Quantity of stones: 3
Approx. carat weight: 6.30 carats in total
Size: 12
Category
21st Century and Contemporary British Pendant Necklaces
Materials
Opal, Fire Opal, 18k Gold, Gold
Minimalist Fire Opal Marquise Shaped Halo Diamond Engagement Ring
Located in Suwanee, GA
.
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ABOUT THIS PRODUCT
18K Yellow Gold
Mexican Fire Opal, 0.30 ct
12 Diamonds: ...
Category
2010s American Artist Engagement Rings
Materials
Diamond, Opal, Fire Opal, 18k Gold, Yellow Gold
Vintage Handcrafted Colorful Opal Diamond Ring 900 Platinum Size 6
Located in McLeansville, NC
Gemstone Information:
- Natural Opal -
Size - 10.8 x 12 mm
Cut - Oval Cabochon
Color - Multi-Color
Category
2010s Fashion Rings
Materials
Diamond, Opal
Dalben Design Australian Boulder Opal Yellow Gold Necklace
By Laura Dalben
Located in Como, IT
Australian Boulder Opal weight 4,29 carat.
pendant dimension :
max width 12 mm
height 19 mm
Chain length
Category
21st Century and Contemporary Italian Contemporary Pendant Necklaces
Materials
Opal, 18k Gold, Gold, Yellow Gold
Dalben Oval Australian Crystal Opal Yellow Gold Ring
By Laura Dalben
Located in Como, IT
dimension:
width 12 mm,
height 9,5 mm.
The ring has been designed and handcrafted in our atelier in Italy
Category
21st Century and Contemporary Italian Contemporary Cocktail Rings
Materials
Opal, Gold, 18k Gold, Yellow Gold
Ring with opal and diamond 18k white gold
Located in The Hague, ZH
size U.S. 7.25 – EU. 17.5(55)
detailed description:
The top of the ring is 12 mm wide
Ring size U.S
Category
2010s Dutch Modern Cluster Rings
Materials
Diamond, Opal, 18k Gold, White Gold
Steven Battelle 11.3 Carats Boulder Opal 18K Gold Ring
By Steven Battelle
Located in Soquel, CA
A bright, electric blue, variegated 12 x 27 mm oval boulder opal is set vertically in an
Category
21st Century and Contemporary Balinese Contemporary Cocktail Rings
Materials
Opal, 18k Gold
Ring with white opal sterling silver size 7
By Kamena Jewellery
Located in Gdynia, PL
.
The diameter of the stone setting is 12 mm. The width of the band is 1.2 mm.
The ring was made in a
Category
21st Century and Contemporary Polish Contemporary Fashion Rings
Materials
Opal, Sterling Silver
Ring with white opal sterling silver size 7.5
By Kamena Jewellery
Located in Gdynia, PL
.
The diameter of the stone setting is 12 mm. The width of the band is 1.2 mm.
The ring was made in a
Category
21st Century and Contemporary Polish Contemporary Fashion Rings
Materials
Opal, Sterling Silver
Ring with white opal sterling silver size 6.5
By Kamena Jewellery
Located in Gdynia, PL
.
The diameter of the stone setting is 12 mm. The width of the band is 1.2 mm.
The ring was made in a
Category
21st Century and Contemporary Polish Contemporary Fashion Rings
Materials
Opal, Sterling Silver
Ring with white opal sterling silver size 8
By Kamena Jewellery
Located in Gdynia, PL
.
The diameter of the stone setting is 12 mm. The width of the band is 1.2 mm.
The ring was made in a
Category
21st Century and Contemporary Polish Contemporary Fashion Rings
Materials
Opal, Sterling Silver
Ring with white opal sterling silver size 6
By Kamena Jewellery
Located in Gdynia, PL
.
The diameter of the stone setting is 12 mm. The width of the band is 1.2 mm.
The ring was made in a
Category
21st Century and Contemporary Polish Contemporary Fashion Rings
Materials
Opal, Sterling Silver
Ring with white opal sterling silver size 8.5
By Kamena Jewellery
Located in Gdynia, PL
.
The diameter of the stone setting is 12 mm. The width of the band is 1.2 mm.
The ring was made in a
Category
21st Century and Contemporary Polish Contemporary Fashion Rings
Materials
Opal, Sterling Silver
Ring with white opal sterling silver size 5.5
By Kamena Jewellery
Located in Gdynia, PL
.
The diameter of the stone setting is 12 mm. The width of the band is 1.2 mm.
The ring was made in a
Category
21st Century and Contemporary Polish Contemporary Fashion Rings
Materials
Opal, Sterling Silver
Black Opal Titanium Gold Earrings Deep Neon Blue Fantasy Shape
By Alexey Gabilo
Located in Berlin, DE
measurements - 0.47 х 0.55 in / 12 х 14 mm
stone weight - 2 carats
earrings measurements - 0.79 х 1.14 in / 20
Category
2010s French Art Nouveau Lever-Back Earrings
Materials
Opal, Black Opal, Gold, Yellow Gold, Titanium
Vintage 4 Opal Drop Pendant Necklace 14k Yellow Gold
Located in Honolulu, HI
3.47 mm, side opals: 8mm x 5mm x 3 mm, bottom opal: 12 mm x 6 mm x 3 mm
Opal Carat Weight: ~4.5
Category
21st Century and Contemporary Unknown Modern Pendant Necklaces
Materials
Opal, 14k Gold, Yellow Gold
Faceted 2.15 Carats Ethiopian Opal Cluster Ring Sterling Silver
Located in Laguna Niguel, CA
: Sterling Silver
Rhodium Plated
Height: 5.5 mm
Width: 21.5 mm
Length: 12 mm
Ring Size: 10* US
*It can be
Category
21st Century and Contemporary Contemporary Cocktail Rings
Materials
Opal, Rhodium, Silver, Sterling Silver
14 Karat White Gold Opal and Diamond Ring
Located in Washington Depot, CT
opal (9 mm x 5 mm) surrounded by 27 round single cut diamonds set in classic 14K white gold. Top of
Category
20th Century Fashion Rings
Materials
Diamond, Opal, 14k Gold, White Gold
Austrian Art Nouveau Opal Foliage Pearl Wide Bracelet
Located in Napoli, IT
approx of natural Opals make the perfect combination in between pearls and glowing enameling creating a
Category
Early 20th Century Austrian Art Nouveau Link Bracelets
Materials
Opal, Pearl, 14k Gold
Rare Natural 6.45 Carats Fire Opal & Diamond Earrings 18K Yellow Gold
Located in Laguna Niguel, CA
Yellow Gold
Dimension: 17 x 12 mm
Category
21st Century and Contemporary Artisan Stud Earrings
Materials
Diamond, White Diamond, Opal, Fire Opal, Gold, Yellow Gold
Chopard 18k White Gold Opal and Diamond Lady’s Watch
By Chopard
Located in beverly hills, CA
multicolor opal dial measures 20 mm x 12 mm and is accompanied by gold hour and minute hands. The white gold
Category
20th Century Wrist Watches
Materials
Diamond, Opal, 18k Gold, White Gold
Cartier Amulette de Cartier Pink Opal and Diamond Bracelet
Located in London, GB
opal with a small opening to one side and a single round brilliant cut diamond at the centre
Category
21st Century and Contemporary Link Bracelets
Materials
Diamond, Opal, 18k Gold, Rose Gold
Faceted 2.15 Carats Ethiopian Opal Cluster Ring Sterling Silver
Located in Laguna Niguel, CA
: Sterling Silver
Rhodium Plated
Height: 5.5 mm
Width: 21.5 mm
Length: 12 mm
Ring Size: 10* US
*It can be
Category
21st Century and Contemporary Contemporary Cocktail Rings
Materials
Opal, Rhodium, Silver, Sterling Silver
- 1
- ...
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12mm Opal For Sale on 1stDibs
Surely you’ll find the exact 12mm opal 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, yellow gold and 14k gold. Find an antique version now, or shop for 441 vintage or 334 modern creation for a more contemporary example of these cherished accessories. If you’re looking for a 12mm opal from a specific time period, our collection is diverse and broad-ranging, and you’ll find at least one that dates back to the 18th Century while another version may have been produced as recently as the 21st Century. Finding an appealing 12mm opal — no matter the origin — is easy, but LB Exclusive, Tutti Frutti Jewellery and Laura Dalben each produced a popular version that is worth a look. A 12mm opal can make for a versatile accessory, but a selection from our variety of 472 opal versions can add an especially stylish touch. An oval cut version of this piece has appeal, but there are also cabochon and round cut versions for sale. There aren’t many items for men if you’re seeking a 12mm opal, as most of the options available are for women and unisex.
How Much is a 12mm Opal?
On average, a 12mm opal at 1stDibs sells for $1,650, while they’re typically $100 on the low end and $42,000 for the highest priced versions of this item.
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