8.7ct Australian Black Boulder Opal Cabochon

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

Dimension: 5mm-17mm 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 Australian

Dimension: 20.5x13.2mm 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 Australi

Dimension: 6mm-15mm 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 Australian

Dimension: 15.8x12.4mm 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 Australi

Dimension: 14.5x10.6mm 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 Australi

Dimension: 4mm-12mm 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 Australian

Dimension: 5mm-18mm 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 Australian

Dimension: 14x6.2mm 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 Australian

Dimension: 19.4x18.6mm 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 Australi

This is a collection of Australian Boulder Opal cabochons. The opal was mined in the Outback of Queensland in Australia. Each one shows fantastic flash and colors of blue, green, red, purple and pink.

This is a collection of Australian Boulder Opal cabochons. The opal was mined in the Outback of Queensland in Australia. Each one shows fantastic flash and colors of blue, green, red, purple and pink.

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

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

Total carat weight of 23.35

This is an antique Art Nouveau 14K gold stickpin featuring a fine Yowah Australian boulder opal cabochon and two Old European cut diamonds. The diamonds are I clarity and HI color. It is 2 1/2" long a

No Reserve! Title: 2.01 Ctw Natural Australian Black Opal Pear Cabochon Stone Clarity: Opaque Gemstones: Australian Opal Size/Dimensions: 2.01 Carat Weights: 9.00 x 7.30 x 3.70 mm Additional Informati

No Reserve! Title: 3.25 Ct Natural Australian Black Opal Oval Cabochon Stone Clarity: Opaque Gemstone: Natural Australian Opal Carat Weight: 3.25 Size/Dimensions: 12.80 x 8.50 x 3.50 mm Additional Inf

No Reserve! Title: 1.87 Ct Natural Australian Black Opal Pear Cabochon Stone Clarity: Opaque Gemstone: Natural Australian Opal Carat Weight: 1.87 Size/Dimensions: 8.20 x 7.50 x 3.70 mm Additional Info

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

Title: 2.30 Ctw Natural Australian Black Opal Oval Cabochon Stone Clarity: Opaque Gemstones: Australian Opal Carat Weights: 2.3 Size/Dimensions: 13.60 x 5.70 x 3.00 mm Additional Information: Nice Ova