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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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32.30ct Black Onyx, Round, Opaque

25.6 mm

$ 32.17

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22.42ct Black Onyx, Pear Shape, Opaque

25 x 18 mm (calibrated)

$ 18.61

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8.25ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 8.22

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10.44ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 10.40

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10.05ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 10.01

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19.24ct Black Onyx, Pear Shape, Opaque

24.9 x 16.9 mm

$ 19.16

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9.95ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 9.91

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4.92ct Black Onyx, Cushion, Opaque

11 x 11 mm (calibrated)

$ 9.80

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2.48ctw Black Onyx, Round, Opaque

6.5 mm (calibrated)

$ 4.94

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2.24ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 4.47

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4.54ct Black Onyx, Cushion, Opaque

11 x 11 mm (calibrated)

$ 9.05

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19.74ct Black Onyx, Oval, Opaque

25 x 18 mm (calibrated)

$ 39.33

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4.77ct Black Onyx, Cushion, Opaque

11 x 11 mm (calibrated)

$ 9.50

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1.23ct Black Onyx, Round, Opaque

7 mm (calibrated)

$ 2.45

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8.07ctw Black Onyx, Oval, Opaque

13 x 11 mm (calibrated)

$ 16.08

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3.11ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 6.19

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3.20ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 6.37

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4.38ct Black Onyx, Heart, Opaque

10.4 x 10.4 mm

$ 4.37

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8.67ctw Black Onyx, Heart, Opaque

10 x 10 mm (calibrated)

$ 8.63

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1.99ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 3.97

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2.24ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 4.47

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2.06ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 4.10

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2.78ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 5.76

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2.05ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 4.08

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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 -> 9 star ratings

I loved the selection of gemstones you have a to z

Posted By James in May, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

Site worked well and helped me find a rock that matched what I was looking for. Well within budget and I trust it will show up, so that's definitely positive. Not much else to it. Satisfied.

Posted By Big Ricky in May, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Easy to use. Many options to find the right gemstone

Posted By Liz in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Wonderful purchase, can't wait to see the stone.

Posted By Tim in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Love, and have always loved, your website.

Posted By Aberabic in July, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Ita's a pretty good and simple way to find gems that youa're looking for amazing selection

Posted By Amman in May, 2026
Source: Bizrate
Enlarged Gemstone Image