Buy 18 - 20 mm Opal Gems(24) |
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18 - 20 mm Opal Gems Single |
18 - 20 mm Opal Gems Pairs |
18 - 20 mm Opal Gems Lots |
18 - 20 mm Opal Gems Faceted |
18 - 20 mm Opal Gems Cabochons |
3 - 4 mm
4 - 5 mm
5 - 6 mm
6 - 7 mm
7 - 8 mm
8 - 9 mm
9 - 10 mm
10 - 12 mm
12 - 14 mm
14 - 16 mm
16 - 18 mm
18 - 20 mm
20 - 25 mm
25 - 30 mm
30 - 40 mm
40 - 60 mm
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Photos are of Actual Products for Sale
7.4 ct Loose Pear Opal, 18.3 x 14.4 mm From Australia
Natural Opal, Qty: 1 pc | 7.40 carat weight Opal
7.40ct1 Piece
$
164.13
18.3 x 14.4 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 7.40 ct Opal |
| Opal Shape: | Pear Cabochon Opal |
| Opal Size: | 18.3 x 14.4 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: | |
View Details
6.91 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 18.8 x 12.3 mm
Natural Opal, Qty: 1 pc | 6.91 carat weight Opal
6.91ct1 Piece
$
174.41
18.8 x 12.3 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 6.91 ct Opal |
| Opal Shape: | Oval Facet Opal |
| Opal Size: | 18.8 x 12.3 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: | |
View Details
4.21 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 18.8 x 8.1 mm
Natural Opal, Qty: 1 pc | 4.21 carat weight Opal
4.21ct1 Piece
$
106.26
18.8 x 8.1 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 4.21 ct Opal |
| Opal Shape: | Oval Facet Opal |
| Opal Size: | 18.8 x 8.1 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: | |
View Details
3.48 carat Pear Shape Opal, loose Certified Opal from Ethiopia, Natural Gem, 18.4 x 9.8 mm
Natural Opal, Qty: 1 pc | 3.48 carat weight Opal
3.48ct1 Piece
$
88.15
18.4 x 9.8 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 3.48 ct Opal |
| Opal Shape: | Pear Facet Opal |
| Opal Size: | 18.4 x 9.8 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: | |
View Details
24.39 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 19.2 x 17.8 mm
Natural Opal, Qty: 1 pc | 24.39 carat weight Opal
24.39ct1 Piece
$
52.44
19.2 x 17.8 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 24.39 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 19.2 x 17.8 mm Opal |
| Opal Color: | Medium Green Opal |
| Opal Clarity: | Opaque Opal |
| Opal Origin: | Brazil Opal |
| Opal Treatment: | Untreated |
| Opal Quantity: | 1 |
| Opal Certificate: | GemSelect |
| Product Description: | |
View Details
9.66 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 18.4 x 13.5 mm
Natural Opal, Qty: 1 pc | 9.66 carat weight Opal
9.66ct1 Piece
$
388.91
18.4 x 13.5 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 9.66 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 18.4 x 13.5 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: | |
View Details
13.64 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 18.5 x 15 mm
Natural Opal, Qty: 1 pc | 13.64 carat weight Opal
13.64ct1 Piece
$
549.15
18.5 x 15 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 13.64 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 18.5 x 15 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: | |
View Details
10.37 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 18.2 x 13.5 mm
Natural Opal, Qty: 1 pc | 10.37 carat weight Opal
10.37ct1 Piece
$
22.94
18.2 x 13.5 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 10.37 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 18.2 x 13.5 mm Opal |
| Opal Color: | Earth Green Opal |
| Opal Clarity: | Opaque Opal |
| Opal Origin: | Brazil Opal |
| Opal Treatment: | Untreated |
| Opal Quantity: | 1 |
| Opal Certificate: | GemSelect |
| Product Description: | |
View Details
9.93 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 19.3 x 13.3 mm
Natural Opal, Qty: 1 pc | 9.93 carat weight Opal
9.93ct1 Piece
$
21.35
19.3 x 13.3 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 9.93 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 19.3 x 13.3 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: | |
View Details
8.21 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 18.5 x 12.5 mm
Natural Opal, Qty: 1 pc | 8.21 carat weight Opal
8.21ct1 Piece
$
17.65
18.5 x 12.5 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 8.21 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 18.5 x 12.5 mm Opal |
| Opal Color: | Medium Green Opal |
| Opal Clarity: | Opaque Opal |
| Opal Origin: | Brazil Opal |
| Opal Treatment: | Untreated |
| Opal Quantity: | 1 |
| Opal Certificate: | GemSelect |
| Product Description: | |
View Details
18.9 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 18.9 x 15.8 mm
Natural Opal, Qty: 1 pc | 18.90 carat weight Opal
18.90ct1 Piece
$
40.64
18.9 x 15.8 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 18.90 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 18.9 x 15.8 mm Opal |
| Opal Color: | Medium Green Opal |
| Opal Clarity: | Opaque Opal |
| Opal Origin: | Brazil Opal |
| Opal Treatment: | Untreated |
| Opal Quantity: | 1 |
| Opal Certificate: | GemSelect |
| Product Description: | |
View Details
9.96 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 18.8 x 13.8 mm
Natural Opal, Qty: 1 pc | 9.96 carat weight Opal
9.96ct1 Piece
$
21.41
18.8 x 13.8 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 9.96 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 18.8 x 13.8 mm Opal |
| Opal Color: | Warm Green Opal |
| Opal Clarity: | Opaque Opal |
| Opal Origin: | Brazil Opal |
| Opal Treatment: | Untreated |
| Opal Quantity: | 1 |
| Opal Certificate: | GemSelect |
| Product Description: | |
View Details
12.46 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 18 x 13.7 mm
Natural Opal, Qty: 1 pc | 12.46 carat weight Opal
12.46ct1 Piece
$
26.79
18 x 13.7 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 12.46 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 18 x 13.7 mm Opal |
| Opal Color: | Warm Green Opal |
| Opal Clarity: | Opaque Opal |
| Opal Origin: | Brazil Opal |
| Opal Treatment: | Untreated |
| Opal Quantity: | 1 |
| Opal Certificate: | GemSelect |
| Product Description: | |
View Details
7.29 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 18.4 x 12.2 mm
Natural Opal, Qty: 1 pc | 7.29 carat weight Opal
7.29ct1 Piece
$
15.67
18.4 x 12.2 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 7.29 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 18.4 x 12.2 mm Opal |
| Opal Color: | Medium Green Opal |
| Opal Clarity: | Opaque Opal |
| Opal Origin: | Brazil Opal |
| Opal Treatment: | Untreated |
| Opal Quantity: | 1 |
| Opal Certificate: | GemSelect |
| Product Description: | |
View Details
11.93 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 19.1 x 14.9 mm
Natural Opal, Qty: 1 pc | 11.93 carat weight Opal
11.93ct1 Piece
$
25.65
19.1 x 14.9 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 11.93 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 19.1 x 14.9 mm Opal |
| Opal Color: | Earth Green Opal |
| Opal Clarity: | Opaque Opal |
| Opal Origin: | Brazil Opal |
| Opal Treatment: | Untreated |
| Opal Quantity: | 1 |
| Opal Certificate: | GemSelect |
| Product Description: | |
View Details
13 carat Pear Shape Opal, loose Certified Opal from Brazil, Natural Untreated Gem, 19.4 x 13.6 mm
Natural Opal, Qty: 1 pc | 13.00 carat weight Opal
13.00ct1 Piece
$
27.95
19.4 x 13.6 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 13.00 ct Opal |
| Opal Shape: | Pear Cabochon Opal |
| Opal Size: | 19.4 x 13.6 mm Opal |
| Opal Color: | Multicolor Opal |
| Opal Clarity: | Opaque Opal |
| Opal Origin: | Brazil Opal |
| Opal Treatment: | Untreated |
| Opal Quantity: | 1 |
| Opal Certificate: | GemSelect |
| Product Description: | |
View Details
16.5 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 18.6 x 13.4 mm
Natural Opal, Qty: 1 pc | 16.50 carat weight Opal
16.50ct1 Piece
$
35.48
18.6 x 13.4 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 16.50 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 18.6 x 13.4 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: | |
View Details
16.51 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 19.6 x 16.1 mm
Natural Opal, Qty: 1 pc | 16.51 carat weight Opal
16.51ct1 Piece
$
35.50
19.6 x 16.1 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 16.51 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 19.6 x 16.1 mm Opal |
| Opal Color: | Earth Green Opal |
| Opal Clarity: | Opaque Opal |
| Opal Origin: | Brazil Opal |
| Opal Treatment: | Untreated |
| Opal Quantity: | 1 |
| Opal Certificate: | GemSelect |
| Product Description: | |
View Details
8.62 carat Green Opal, Pear Shape loose Opal from Brazil, Natural Untreated Gem, 20 x 14.5 mm
Natural Opal, Qty: 1 pc | 8.62 carat weight Opal
8.62ct1 Piece
$
18.53
20 x 14.5 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 8.62 ct Opal |
| Opal Shape: | Pear Cabochon Opal |
| Opal Size: | 20 x 14.5 mm Opal |
| Opal Color: | Medium Green Opal |
| Opal Clarity: | Opaque Opal |
| Opal Origin: | Brazil Opal |
| Opal Treatment: | Untreated |
| Opal Quantity: | 1 |
| Opal Certificate: | GemSelect |
| Product Description: | |
View Details
15.66 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 19.6 x 15.1 mm
Natural Opal, Qty: 1 pc | 15.66 carat weight Opal
15.66ct1 Piece
$
33.67
19.6 x 15.1 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 15.66 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 19.6 x 15.1 mm Opal |
| Opal Color: | Earth Green Opal |
| Opal Clarity: | Opaque Opal |
| Opal Origin: | Brazil Opal |
| Opal Treatment: | Untreated |
| Opal Quantity: | 1 |
| Opal Certificate: | GemSelect |
| Product Description: | |
View Details
7.07 carat Pear Shape Opal, loose Certified Opal from Australia, Natural Untreated Gem, 19.1 x 13.5 mm
Natural Opal, Qty: 1 pc | 7.07 carat weight Opal
7.07ct1 Piece
$
176.75
19.1 x 13.5 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 7.07 ct Opal |
| Opal Shape: | Pear Cabochon Opal |
| Opal Size: | 19.1 x 13.5 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: | |
View Details
5.82 carat Pear Shape Opal, loose Certified Opal from Australia, Natural Untreated Gem, 19.2 x 11.4 mm
Natural Opal, Qty: 1 pc | 5.82 carat weight Opal
5.82ct1 Piece
$
145.50
19.2 x 11.4 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 5.82 ct Opal |
| Opal Shape: | Pear Cabochon Opal |
| Opal Size: | 19.2 x 11.4 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: | |
View Details
12.06 carat Trillion Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 18 x 17.2 mm
Natural Opal, Qty: 1 pc | 12.06 carat weight Opal
12.06ct1 Piece
$
485.54
18 x 17.2 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 12.06 ct Opal |
| Opal Shape: | Trillion Cabochon Opal |
| Opal Size: | 18 x 17.2 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: | |
View Details
15.72 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 19.5 x 17.1 mm
Natural Opal, Qty: 1 pc | 15.72 carat weight Opal
15.72ct1 Piece
$
696.18
19.5 x 17.1 mm
| Item Description | |
|---|---|
| Stone Type: | Loose Opal |
| Opal Weight: | 15.72 ct Opal |
| Opal Shape: | Oval Cabochon Opal |
| Opal Size: | 19.5 x 17.1 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: | |
View Details
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