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Buy Opal Cabochons Gems

(1052)
Opal Cabochons Weight Opal Cabochons Size Opal Cabochons Clarity Opal Cabochons Price Opal Cabochons Origin
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Photos are of Actual Products for Sale
13.80ct1 Piece
$ 690.00
23.3 x 11.2 mm
Item Description
Stone Type: Loose Opal
Opal Weight: 13.80 ct Opal
Opal Shape: Oval Cabochon Opal
Opal Size: 23.3 x 11.2 mm Opal
Opal Color: Multicolor Opal
Opal Clarity: Transparent Opal
Opal Origin: Australia Opal
Opal Treatment: Untreated
Opal Quantity: 1
Opal Certificate: GemSelect
Product Description:
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35.99 ct Fancy Boulder Opal, 45 x 23.8 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 35.99 carat weight Boulder Opal

35.99ct1 Piece
$ 107.97
45 x 23.8 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 35.99 ct Boulder Opal
Boulder Opal Shape: Fancy Cabochon Boulder Opal
Boulder Opal Size: 45 x 23.8 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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1.42ct1 Piece
$ 46.86
9.6 x 6.8 mm
Item Description
Stone Type: Loose Opal
Opal Weight: 1.42 ct Opal
Opal Shape: Pear Cabochon Opal
Opal Size: 9.6 x 6.8 mm Opal
Opal Color: Multicolor Opal
Opal Clarity: Opaque Opal
Opal Origin: Ethiopia Opal
Opal Treatment: Smoked
Opal Quantity: 1
Opal Certificate: GemSelect
Product Description:
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1.66ct1 Piece
$ 46.48
10.5 x 7.7 mm
Item Description
Stone Type: Loose Opal
Opal Weight: 1.66 ct Opal
Opal Shape: Fancy Cabochon Opal
Opal Size: 10.5 x 7.7 mm Opal
Opal Color: Multicolor Opal
Opal Clarity: Translucent Opal
Opal Origin: Ethiopia Opal
Opal Treatment: Smoked
Opal Quantity: 1
Opal Certificate: GemSelect
Product Description:
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19.94 ct Marquise Boulder Opal, 36.4 x 16.3 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 19.94 carat weight Boulder Opal

19.94ct1 Piece
$ 109.67
36.4 x 16.3 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 19.94 ct Boulder Opal
Boulder Opal Shape: Marquise Cabochon Boulder Opal
Boulder Opal Size: 36.4 x 16.3 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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20.3 ct Fancy Boulder Opal, 25.5 x 16 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 20.30 carat weight Boulder Opal

20.30ct1 Piece
$ 101.50
25.5 x 16 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 20.30 ct Boulder Opal
Boulder Opal Shape: Fancy Cabochon Boulder Opal
Boulder Opal Size: 25.5 x 16 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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2.54ct1 Piece
$ 71.12
11.9 x 8.6 mm
Item Description
Stone Type: Loose Opal
Opal Weight: 2.54 ct Opal
Opal Shape: Fancy Cabochon Opal
Opal Size: 11.9 x 8.6 mm Opal
Opal Color: Multicolor Opal
Opal Clarity: Translucent Opal
Opal Origin: Ethiopia Opal
Opal Treatment: Smoked
Opal Quantity: 1
Opal Certificate: GemSelect
Product Description:
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8.11ct1 Piece
$ 90.55
22.1 x 13.8 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 8.11 ct Boulder Opal
Boulder Opal Shape: Pear Cabochon Boulder Opal
Boulder Opal Size: 22.1 x 13.8 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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21.39 ct Cushion Boulder Opal, 16.4 x 16.4 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 21.39 carat weight Boulder Opal

21.39ct1 Piece
$ 164.70
16.4 x 16.4 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 21.39 ct Boulder Opal
Boulder Opal Shape: Cushion Cabochon Boulder Opal
Boulder Opal Size: 16.4 x 16.4 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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1.84ct1 Piece
$ 64.40
13.8 x 6.7 mm
Item Description
Stone Type: Loose Opal
Opal Weight: 1.84 ct Opal
Opal Shape: Marquise Cabochon Opal
Opal Size: 13.8 x 6.7 mm Opal
Opal Color: Multicolor Opal
Opal Clarity: Transparent Opal
Opal Origin: Ethiopia Opal
Opal Treatment: Untreated
Opal Quantity: 1
Opal Certificate: GemSelect
Product Description:
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17.03 ct Fancy Boulder Opal, 26.9 x 13.5 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 17.03 carat weight Boulder Opal

17.03ct1 Piece
$ 93.67
26.9 x 13.5 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 17.03 ct Boulder Opal
Boulder Opal Shape: Fancy Cabochon Boulder Opal
Boulder Opal Size: 26.9 x 13.5 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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2.45ct1 Piece
$ 68.60
11.2 x 10 mm
Item Description
Stone Type: Loose Opal
Opal Weight: 2.45 ct Opal
Opal Shape: Fancy Cabochon Opal
Opal Size: 11.2 x 10 mm Opal
Opal Color: Multicolor Opal
Opal Clarity: Translucent Opal
Opal Origin: Ethiopia Opal
Opal Treatment: Smoked
Opal Quantity: 1
Opal Certificate: GemSelect
Product Description:
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23.4 ct Oval Boulder Opal, 24.1 x 16.7 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 23.40 carat weight Boulder Opal

23.40ct1 Piece
$ 117.00
24.1 x 16.7 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 23.40 ct Boulder Opal
Boulder Opal Shape: Oval Cabochon Boulder Opal
Boulder Opal Size: 24.1 x 16.7 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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20.1 ct Cushion Boulder Opal, 21.1 x 16.6 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 20.10 carat weight Boulder Opal

20.10ct1 Piece
$ 100.50
21.1 x 16.6 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 20.10 ct Boulder Opal
Boulder Opal Shape: Cushion Cabochon Boulder Opal
Boulder Opal Size: 21.1 x 16.6 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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26.43 ct Oval Boulder Opal, 28.5 x 17.9 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 26.43 carat weight Boulder Opal

26.43ct1 Piece
$ 145.37
28.5 x 17.9 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 26.43 ct Boulder Opal
Boulder Opal Shape: Oval Cabochon Boulder Opal
Boulder Opal Size: 28.5 x 17.9 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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1.30ct1 Piece
$ 42.90
10.2 x 6.9 mm
Item Description
Stone Type: Loose Black Opal
Black Opal Weight: 1.30 ct Black Opal
Black Opal Shape: Pear Cabochon Black Opal
Black Opal Size: 10.2 x 6.9 mm Black Opal
Black Opal Color: Multicolor Black Opal
Black Opal Clarity: Translucent Black Opal
Black Opal Origin: Ethiopia Black Opal
Black Opal Treatment: Smoked
Black Opal Quantity: 1
Black Opal Certificate: GemSelect
Product Description:
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30.94 ct Fancy Boulder Opal, 25.4 x 20.1 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 30.94 carat weight Boulder Opal

30.94ct1 Piece
$ 170.17
25.4 x 20.1 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 30.94 ct Boulder Opal
Boulder Opal Shape: Fancy Cabochon Boulder Opal
Boulder Opal Size: 25.4 x 20.1 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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16.81 ct Fancy Boulder Opal, 28.8 x 13.1 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 16.81 carat weight Boulder Opal

16.81ct1 Piece
$ 84.05
28.8 x 13.1 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 16.81 ct Boulder Opal
Boulder Opal Shape: Fancy Cabochon Boulder Opal
Boulder Opal Size: 28.8 x 13.1 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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5.66 ct Oval Black Opal, 15.6 x 11.6 mm From Ethiopia

Natural Black Opal, Qty: 1 pc | 5.66 carat weight Black Opal

5.66ct1 Piece
$ 169.80
15.6 x 11.6 mm
Item Description
Stone Type: Loose Black Opal
Black Opal Weight: 5.66 ct Black Opal
Black Opal Shape: Oval Cabochon Black Opal
Black Opal Size: 15.6 x 11.6 mm Black Opal
Black Opal Color: Multicolor Black Opal
Black Opal Clarity: Opaque Black Opal
Black Opal Origin: Ethiopia Black Opal
Black Opal Treatment: Smoked
Black Opal Quantity: 1
Black Opal Certificate: GemSelect
Product Description:
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10.94ct1 Piece
$ 256.93
22.1 x 13.7 mm
Item Description
Stone Type: Loose Fire Opal
Fire Opal Weight: 10.94 ct Fire Opal
Fire Opal Shape: Pear Cabochon Fire Opal
Fire Opal Size: 22.1 x 13.7 mm Fire Opal
Fire Opal Color: Golden-Orange Fire Opal
Fire Opal Clarity: Transparent Fire Opal
Fire Opal Origin: Mexico Fire Opal
Fire Opal Treatment: Untreated
Fire Opal Quantity: 1
Fire Opal Certificate: GemSelect
Product Description:
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2.81ct1 Piece
$ 78.68
12.6 x 9.1 mm
Item Description
Stone Type: Loose Opal
Opal Weight: 2.81 ct Opal
Opal Shape: Fancy Cabochon Opal
Opal Size: 12.6 x 9.1 mm Opal
Opal Color: Multicolor Opal
Opal Clarity: Translucent Opal
Opal Origin: Ethiopia Opal
Opal Treatment: Smoked
Opal Quantity: 1
Opal Certificate: GemSelect
Product Description:
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15.88 ct Cushion Boulder Opal, 23.1 x 12.2 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 15.88 carat weight Boulder Opal

15.88ct1 Piece
$ 111.16
23.1 x 12.2 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 15.88 ct Boulder Opal
Boulder Opal Shape: Cushion Cabochon Boulder Opal
Boulder Opal Size: 23.1 x 12.2 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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6.78ct1 Piece
$ 203.40
16.8 x 14.4 mm
Item Description
Stone Type: Loose Black Opal
Black Opal Weight: 6.78 ct Black Opal
Black Opal Shape: Pear Cabochon Black Opal
Black Opal Size: 16.8 x 14.4 mm Black Opal
Black Opal Color: Multicolor Black Opal
Black Opal Clarity: Opaque Black Opal
Black Opal Origin: Ethiopia Black Opal
Black Opal Treatment: Smoked
Black Opal Quantity: 1
Black Opal Certificate: GemSelect
Product Description:
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18.73ct1 Piece
$ 40.27
23.3 x 12.9 mm
Item Description
Stone Type: Loose Opal
Opal Weight: 18.73 ct Opal
Opal Shape: Oval Cabochon Opal
Opal Size: 23.3 x 12.9 mm Opal
Opal Color: Yellowish Green Opal
Opal Clarity: Opaque Opal
Opal Origin: Brazil Opal
Opal Treatment: Untreated
Opal Quantity: 1
Opal Certificate: GemSelect
Product Description:
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33.71 ct Fancy Boulder Opal, 32.6 x 22.1 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 33.71 carat weight Boulder Opal

33.71ct1 Piece
$ 185.41
32.6 x 22.1 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 33.71 ct Boulder Opal
Boulder Opal Shape: Fancy Cabochon Boulder Opal
Boulder Opal Size: 32.6 x 22.1 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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25.5 ct Trillion Boulder Opal, 22.1 x 21.4 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 25.50 carat weight Boulder Opal

25.50ct1 Piece
$ 127.50
22.1 x 21.4 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 25.50 ct Boulder Opal
Boulder Opal Shape: Trillion Cabochon Boulder Opal
Boulder Opal Size: 22.1 x 21.4 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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7.64 ct Oval Black Opal, 16.8 x 13.3 mm From Ethiopia

Natural Black Opal, Qty: 1 pc | 7.64 carat weight Black Opal

7.64ct1 Piece
$ 229.20
16.8 x 13.3 mm
Item Description
Stone Type: Loose Black Opal
Black Opal Weight: 7.64 ct Black Opal
Black Opal Shape: Oval Cabochon Black Opal
Black Opal Size: 16.8 x 13.3 mm Black Opal
Black Opal Color: Multicolor Black Opal
Black Opal Clarity: Opaque Black Opal
Black Opal Origin: Ethiopia Black Opal
Black Opal Treatment: Smoked
Black Opal Quantity: 1
Black Opal Certificate: GemSelect
Product Description:
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20.97 ct Oval Boulder Opal, 21.5 x 15.7 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 20.97 carat weight Boulder Opal

20.97ct1 Piece
$ 104.85
21.5 x 15.7 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 20.97 ct Boulder Opal
Boulder Opal Shape: Oval Cabochon Boulder Opal
Boulder Opal Size: 21.5 x 15.7 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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1.25ct1 Piece
$ 30.25
10.2 x 7.9 mm
Item Description
Stone Type: Loose Opal
Opal Weight: 1.25 ct Opal
Opal Shape: Pear Cabochon Opal
Opal Size: 10.2 x 7.9 mm Opal
Opal Color: Multicolor Opal
Opal Clarity: Translucent Opal
Opal Origin: Australia Opal
Opal Treatment: Untreated
Opal Quantity: 1
Opal Certificate: GemSelect
Product Description:
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1.50ct1 Piece
$ 31.50
11.8 x 7.9 mm
Item Description
Stone Type: Loose Opal
Opal Weight: 1.50 ct Opal
Opal Shape: Pear Cabochon Opal
Opal Size: 11.8 x 7.9 mm Opal
Opal Color: Multicolor Opal
Opal Clarity: Translucent Opal
Opal Origin: Ethiopia Opal
Opal Treatment: Untreated
Opal Quantity: 1
Opal Certificate: GemSelect
Product Description:
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17.29 ct Fancy Boulder Opal, 27 x 17.2 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 17.29 carat weight Boulder Opal

17.29ct1 Piece
$ 95.10
27 x 17.2 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 17.29 ct Boulder Opal
Boulder Opal Shape: Fancy Cabochon Boulder Opal
Boulder Opal Size: 27 x 17.2 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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17.73 ct Fancy Boulder Opal, 23.7 x 15.3 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 17.73 carat weight Boulder Opal

17.73ct1 Piece
$ 88.65
23.7 x 15.3 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 17.73 ct Boulder Opal
Boulder Opal Shape: Fancy Cabochon Boulder Opal
Boulder Opal Size: 23.7 x 15.3 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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4.68 ct Marquise Black Opal, 23.6 x 8.5 mm From Ethiopia

Natural Black Opal, Qty: 1 pc | 4.68 carat weight Black Opal

4.68ct1 Piece
$ 140.40
23.6 x 8.5 mm
Item Description
Stone Type: Loose Black Opal
Black Opal Weight: 4.68 ct Black Opal
Black Opal Shape: Marquise Cabochon Black Opal
Black Opal Size: 23.6 x 8.5 mm Black Opal
Black Opal Color: Multicolor Black Opal
Black Opal Clarity: Opaque Black Opal
Black Opal Origin: Ethiopia Black Opal
Black Opal Treatment: Smoked
Black Opal Quantity: 1
Black Opal Certificate: GemSelect
Product Description:
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28.58 ct Oval Boulder Opal, 23.1 x 18.5 mm From Australia

Natural Boulder Opal, Qty: 1 pc | 28.58 carat weight Boulder Opal

28.58ct1 Piece
$ 200.06
23.1 x 18.5 mm
Item Description
Stone Type: Loose Boulder Opal
Boulder Opal Weight: 28.58 ct Boulder Opal
Boulder Opal Shape: Oval Cabochon Boulder Opal
Boulder Opal Size: 23.1 x 18.5 mm Boulder Opal
Boulder Opal Color: Multicolor Boulder Opal
Boulder Opal Clarity: Opaque Boulder Opal
Boulder Opal Origin: Australia Boulder Opal
Boulder Opal Treatment: Untreated
Boulder Opal Quantity: 1
Boulder Opal Certificate: GemSelect
Product Description:
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2.73ct1 Piece
$ 76.44
13.6 x 11.1 mm
Item Description
Stone Type: Loose Opal
Opal Weight: 2.73 ct Opal
Opal Shape: Fancy Cabochon Opal
Opal Size: 13.6 x 11.1 mm Opal
Opal Color: Multicolor Opal
Opal Clarity: Translucent Opal
Opal Origin: Ethiopia Opal
Opal Treatment: Smoked
Opal Quantity: 1
Opal Certificate: GemSelect
Product Description:
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1.72ct (total)2 Pieces
$ 430.00
8 x 6 mm
Item Description
Stone Type: Loose Opal
Opal Weight: 0.86 ct Opal
Opal Shape: Oval Cabochon Opal
Opal Size: 8 x 6 mm Opal
Opal Color: Multicolor Opal
Opal Clarity: Translucent Opal
Opal Origin: Australia Opal
Opal Treatment: Untreated
Opal Quantity: 2
Opal Certificate: GemSelect
Product Description:
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1 2 3
1 - 30
More than any other gem, each opal is distinctly an individual. No other stone has as rich and varied a folklore. Opals are also the most delicate gems commonly worn. They require special care to ensure their health and longevity.

Opal's fire was long thought to be the result of iridescence. However, with the advent of scanning electron microscopes, we now know that it is a result of diffraction.

Opal is relatively soft, with a rating of 5.5-6.5 on the Mohs scale. Despite its frequent use in rings, opal is a poor choice for a ring stone; it is much better suited to earrings, pins, and pendants.

Major suppliers include Australia, Brazil, Mexico, and the US. Values are normally determined by the presence and nature of color flashes.
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