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Home Gemstones Onyx

Loose Onyx Gemstones: Black Onyx, White Onyx and Banded Onyx for Jewelry | Onyx Carvings

Onyx Weight
Onyx Size
Onyx Clarity
Onyx Price

Size Explained

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For Example: 8-9
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Black Onyx
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2.88ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 5.74

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1.08ct Black Onyx, Round, Opaque

7 mm (calibrated)

$ 2.15

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4.19ct Black Onyx, Heart, Opaque

10.4 x 10.3 mm

$ 4.17

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11.60ct Black Onyx, Pear Shape, Opaque

19.4 x 14.2 mm

$ 11.55

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2.78ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 5.76

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9.70ctw Black Onyx, Cushion, Opaque

11 x 11 mm (calibrated)

$ 9.66

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2.84ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 4.71

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20.57ctw Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 20.48

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10.51ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 10.47

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19.71ct Black Onyx, Pear Shape, Opaque

25 x 18 mm (calibrated)

$ 19.63

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2.31ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 4.60

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4.46ct Black Onyx, Heart, Opaque

10.5 x 10.3 mm

$ 4.44

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4.77ct Black Onyx, Cushion, Opaque

11 x 11 mm (calibrated)

$ 9.50

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8.54ctw Black Onyx, Heart, Opaque

10 x 10 mm (calibrated)

$ 8.51

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2.32ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 4.62

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1.70ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 2.82

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4.92ct Black Onyx, Cushion, Opaque

11 x 11 mm (calibrated)

$ 9.80

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1.96ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 3.90

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3.11ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 6.19

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1.37ct Black Onyx, Round, Opaque

7 mm (calibrated)

$ 2.73

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3.07ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 6.12

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10.05ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 10.01

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2.43ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 4.84

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8.38ctw Black Onyx, Heart, Opaque

10.5 x 10.4 mm

$ 8.35

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Why Buy 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 star ratings

It was all good

Posted By Debsarabs in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.

Posted By G.W. in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Good selection prices are reasonable!

Posted By ToRa62 in April, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

I've purchased things from GemSelect before. What you see is what you get, which is not always the case with gem sites online. You can find some good value with gem select, and I will buy from them again.

Posted By Meyeusername in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

The stones are very nice.

Posted By Mvk in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very pleasant

Posted By Varun in June, 2026
Source: Bizrate
Enlarged Gemstone Image