12 Carats of Australian Black Boulder Opal

2.44 grams or 12 carats. Meausres 3/4" by 1/2" by 1/4"

3.06 grams or 15.3 carats. 1/2" by 5/8".

Total carat weight of 21.7

Total carat weight of 28.55

Total carat weight of 23.5

Total carat weight of 23.35

Item: Australian Black Opal - Lightning Ridge Loose Gemstone: Black Opal Carat Weight: 1.2 Size/Dimensions: 10 mm x 6 mm x 3.8 mm Shape: Freeform  / Origin: Lighting Ridge, Australia / Treatment: No

Reserve Reduced! Title: Australian Boulder Opal Gemstones: Boulder Opal Carat Weights: 12.3 Size/Dimensions: 33 mm x 10 mm x 3.6 mm Additional Information: Australian Koroit Opal Fields Reserve: $25.0

Item: Australian Lighting Ridge Black Opal Loose Gemstone: Opal Carat Weight: 3.08 Dimensions: 15.5 mm x 12.5 mm x 3.5 mm Shape: Triangle Shipping: Domestic: Flat-rate of $4.00 to anywhere within the

Title: Lightning Ridge Australian Black Opal Certified- 1.12 ct Metal Purity: Natural, Certified Gemstones: Australian Opal Carat Weights: 1.12 ct Size/Dimensions: 9.13 x 7.50 x 2.74 mm Additional Inf

Item: 5.92 ct Australian Boulder Opal Gemstones: Opal Carat Weights: 5.92 Size/Dimensions: 17.5 mm x 12.4 mm x 4.0 mm Please note that this lot has a confidential reserve. When you leave a bid in adva

Item: 3.55 ct Australian Boulder Opal Gemstones: Boulder Opal Carat Weights: 3.55 Size/Dimensions: 12.2 mm x 10.8 mm x 3.5 mm No Reserve: This lot starts at $1 and has no reserve as a courtesy so that

Title: 10.74 ct Australian Boulder Opal Gemstones: Boulder Opal Carat Weights: 10.74 Size/Dimensions: 26 mm x 12 mm x 4.5 mm Additional Information: Koroit Opal Fields Please note that this lot has a

Reserve Reduced! Title: Australian Boulder Opal Gemstones: Boulder Opal Carat Weights: 4.3 Size/Dimensions: 17.7 mm x 12 mm x 3.1 mm Additional Information: Australian Koroit Opal Fields Reserve: $10.

Title: Australian Black Opal Certified - 4.02 ct Metal Purity: Natural, Certified Gemstones: Australian Opal Carat Weights: 4.02 ct Size/Dimensions: 12.17 x 12.02 x 3.63 mm Additional Information: Nat

Title: Australian Black Opal Certified- 4.57 ct Metal Purity: Natural, Certified Gemstones: Australian Opal Carat Weights: 4.57 ct Size/Dimensions: 19.57 x 12.48 x 2.81 mm Additional Information: Natu

No Reserve! Title: 3.06 Ct Natural Australian Black Opal Trillion Cabochon Stone Clarity: Opaque Gemstones: Natural Australian Opal Carat Weights: 3.06 Size/Dimensions: 12.50 x 8.40 x 4.00 mm Addition

Dimension: 12.7x9.7mm Natural History of Australian Opal & Mineral Auction by Thousand Planet Auction House featuring the beauty of Boulder Opal art in cabochon cutting and rough, well known Australia

Item: NO RESERVE Australian Boulder Opal Loose Gemstone: Boulder Opal Carat Weight: 1.19 Size/Dimensions: 8.1 mm x 6.5 mm x 2.5 mm Shape: Oval  / Origin: Koroit Opal Fields, Australia / Treatment: N

Item: NO RESERVE Australian Boulder Opal Loose Gemstone: Boulder Opal Carat Weight: 2.34 Size/Dimensions: 10.4 mm x 8.2 mm x 3.9 mm Shape: Oval / Origin: Koroit Opal Fields, Australia / Treatment: Non

DIMENSIONS APPROX 7x3x5CM. Please carefully study all photographs to get an accurate idea of the object. In good condition, as seen. Shipping is in-house and we ship internationally to US and rest of

Item: Australian Lighting Ridge Black Opal Loose Gemstone: Black Opal Carat Weight: 3.02 Origin: Lightning Ridge, Australia Please note that this lot has a confidential reserve. When you leave a bid i

Item: Australian Lighting Ridge Black Opal Loose Gemstone: Black Opal Carat Weight: 0.9 Size/Dimensions: 7.1 mm x 6.1 mm x 3.4 mm Origin: Lightning Ridge, Australia Please note that this lot has a con

No Reserve! Title: 12.75 Ctw Natural Ethiopian Black Fire Opal Oval Cab Stone Clarity: Translucent Gemstones: Black Opal Carat Weights: 12.75 Size/Dimensions: 12.70 x 8.70 x 5.20 mm Additional Informa