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Gemtypes in Category:
Onyx (295)
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ID:
687492
Weight:
1.59
Size:
7 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
3.82
Item in Stock
More Options & Item Details
ID:
688178
Weight:
2.05
Size:
5.5 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
4.92
Item in Stock
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ID:
722392
Weight:
10.00
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
12.00
Item in Stock
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ID:
669107
Weight:
8.63
Size:
10 x 10 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
10.36
Item in Stock
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ID:
688031
Weight:
2.94
Size:
7 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
7.06
Item in Stock
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ID:
688343
Weight:
2.90
Size:
7 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
6.96
Item in Stock
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ID:
721377
Weight:
8.25
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Price:
$
9.90
Item in Stock
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ID:
672447
Weight:
12.30
Size:
20 x 15 mm (calibrated)
Clarity:
Opaque
Price:
$
29.52
Item in Stock
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ID:
721788
Weight:
8.70
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
10.44
Item in Stock
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ID:
687942
Weight:
1.16
Size:
6.5 mm (calibrated)
Clarity:
Opaque
Price:
$
2.78
Item in Stock
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1
2
3
4
pcs 0 in Cart
ID:
721784
Weight:
9.95
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Price:
$
11.94
Item in Stock
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1
2
3
pcs 0 in Cart
ID:
687491
Weight:
1.42
Size:
7 mm (calibrated)
Clarity:
Opaque
Price:
$
3.41
Item in Stock
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1
2
3
4
pcs 0 in Cart
ID:
668255
Weight:
9.56
Size:
11 x 11 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
11.47
Item in Stock
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ID:
671955
Weight:
4.74
Size:
11 x 11 mm (calibrated)
Clarity:
Opaque
Price:
$
11.38
Item in Stock
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1
2
3
4
5
pcs 0 in Cart
ID:
669221
Weight:
4.19
Size:
10.5 x 10.3 mm
Clarity:
Opaque
Price:
$
5.03
Item in Stock
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1
2
3
4
5
6
7
pcs 0 in Cart
ID:
671962
Weight:
4.85
Size:
11 x 11 mm (calibrated)
Clarity:
Opaque
Price:
$
11.64
Item in Stock
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1
2
3
4
pcs 0 in Cart
ID:
669900
Weight:
4.36
Size:
10.5 x 10.3 mm
Clarity:
Opaque
Price:
$
5.23
Item in Stock
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1
2
3
4
5
6
pcs 0 in Cart
ID:
721331
Weight:
4.31
Size:
10.5 x 10.3 mm
Clarity:
Opaque
Content:
1 pc
Price:
$
5.17
Item in Stock
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ID:
669135
Weight:
4.10
Size:
10 x 10 mm (calibrated)
Clarity:
Opaque
Price:
$
4.92
Item in Stock
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1
2
3
pcs 0 in Cart
ID:
669297
Weight:
20.08
Size:
25 x 18 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
24.10
Item in Stock
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ID:
722398
Weight:
10.08
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Price:
$
12.10
Item in Stock
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1
2
3
4
5
pcs 0 in Cart
ID:
672441
Weight:
3.19
Size:
9.9 x 9.3 mm
Clarity:
Opaque
Content:
1 pc
Price:
$
7.66
Item in Stock
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ID:
687777
Weight:
2.12
Size:
5.5 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
5.09
Item in Stock
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ID:
722385
Weight:
22.03
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
26.44
Item in Stock
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ID:
722386
Weight:
12.67
Size:
18.5 x 13.9 mm
Clarity:
Opaque
Content:
1 pc
Price:
$
15.20
Item in Stock
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ID:
722387
Weight:
5.80
Size:
16 x 12 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
5.80
Item in Stock
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ID:
721605
Weight:
9.47
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Price:
$
11.36
Item in Stock
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1
2
3
pcs 0 in Cart
ID:
721794
Weight:
10.32
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
12.38
Item in Stock
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ID:
668337
Weight:
10.74
Size:
19.1 x 14.5 mm
Clarity:
Opaque
Price:
$
9.89
Item in Stock
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ID:
672438
Weight:
4.24
Size:
10 x 10 mm (calibrated)
Clarity:
Opaque
Price:
$
10.18
Item in Stock
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ID:
721610
Weight:
10.30
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
12.36
Item in Stock
More Options & Item Details
ID:
684427
Weight:
0.00
Size:
3.5 mm (calibrated)
Clarity:
Opaque
Price:
$
0.49
Item in Stock
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1
2
3
4
5
6
7
8
9
10
11
12
13
pcs
ID:
721547
Weight:
8.66
Size:
10.5 x 10.4 mm
Clarity:
Opaque
Content:
2 pcs
Price:
$
10.39
Item in Stock
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ID:
722407
Weight:
11.38
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Price:
$
13.66
Item in Stock
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ID:
668254
Weight:
9.68
Size:
11 x 11 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
11.62
Item in Stock
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ID:
721335
Weight:
4.14
Size:
10.4 x 10.4 mm
Clarity:
Opaque
Content:
1 pc
Price:
$
4.97
Item in Stock
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ID:
721376
Weight:
9.48
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
11.38
Item in Stock
More Options & Item Details
ID:
721785
Weight:
11.60
Size:
19.4 x 14.2 mm
Clarity:
Opaque
Content:
1 pc
Price:
$
13.92
Item in Stock
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ID:
669124
Weight:
3.30
Size:
9.9 x 9.4 mm
Clarity:
Opaque
Price:
$
3.96
Item in Stock
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1
2
3
pcs 0 in Cart
ID:
688033
Weight:
3.17
Size:
7 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
7.61
Item in Stock
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ID:
687653
Weight:
1.78
Size:
5.5 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
4.27
Item in Stock
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ID:
669109
Weight:
9.70
Size:
11 x 11 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
11.64
Item in Stock
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ID:
721542
Weight:
8.89
Size:
10.5 x 10.5 mm
Clarity:
Opaque
Content:
2 pcs
Price:
$
10.67
Item in Stock
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ID:
668911
Weight:
6.69
Size:
9.9 x 9.4 mm
Clarity:
Opaque
Content:
2 pcs
Price:
$
8.03
Item in Stock
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ID:
722390
Weight:
9.35
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
11.22
Item in Stock
More Options & Item Details
ID:
669220
Weight:
4.16
Size:
10.4 x 10.3 mm
Clarity:
Opaque
Price:
$
4.99
Item in Stock
More Options & Item Details
Select
1
2
3
4
5
6
pcs 0 in Cart
ID:
688344
Weight:
2.89
Size:
7 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
6.94
Item in Stock
More Options & Item Details
ID:
672033
Weight:
19.82
Size:
25 x 18 mm (calibrated)
Clarity:
Opaque
Price:
$
47.57
Item in Stock
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1
2
3
4
pcs 0 in Cart
ID:
673182
Weight:
8.12
Size:
13 x 11 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
19.49
Item in Stock
More Options & Item Details
ID:
721550
Weight:
8.43
Size:
10.4 x 10.4 mm
Clarity:
Opaque
Content:
2 pcs
Price:
$
10.12
Item in Stock
More Options & Item Details
ID:
721790
Weight:
10.07
Size:
18 x 13 mm (calibrated)
Clarity:
Opaque
Price:
$
12.08
Item in Stock
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1
2
3
4
pcs 0 in Cart
ID:
672129
Weight:
4.71
Size:
11 x 11 mm (calibrated)
Clarity:
Opaque
Price:
$
11.30
Item in Stock
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1
2
3
4
pcs 0 in Cart
ID:
669429
Weight:
8.90
Size:
10.5 x 10.4 mm
Clarity:
Opaque
Content:
2 pcs
Price:
$
10.68
Item in Stock
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ID:
721544
Weight:
8.66
Size:
10.5 x 10.3 mm
Clarity:
Opaque
Content:
2 pcs
Price:
$
10.39
Item in Stock
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ID:
668915
Weight:
9.65
Size:
11 x 11 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
11.58
Item in Stock
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Why Buy Black Onyx from GemSelect?
GemSelect Certified Store Reviews
GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!
Overall Rating -> 10
I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.
Posted By Tim W in February, 2026
Source: Bizrate
Overall Rating -> 10
GemSelect is always my first choice for purchasing gemstones. The fact that the gems are always exactly as described and pictured on the website has earned my trust many times over. Even when I don't buy, I still love browsing all the beautiful stones. My new favorites are the bright green Tsavorites!
Posted By Lkcisneros in March, 2026
Source: Bizrate
Overall Rating -> 10
Very good.
Posted By Tommy in December, 2025
Source: Bizrate
Overall Rating -> 9
Plan on purchasing on an ongoing basis. So far.....so good....
Posted By Jim in January, 2026
Source: Bizrate
Overall Rating -> 10
My whole experience is great.
Posted By Ghs in November, 2025
Source: Bizrate
Overall Rating -> 10
It was easy and to the point
Posted By Victorius in May, 2025
Source: Bizrate