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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
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Onyx Price

Size Explained

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For Example: 8-9
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Black Onyx
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4.54ct Black Onyx, Cushion, Opaque

11 x 11 mm (calibrated)

$ 9.05

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10.11ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 10.07

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3.16ct Black Onyx, Trillion, Opaque

9.8 x 9.3 mm

$ 3.15

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2.93ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 4.86

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26.38ct Black Onyx, Baguette, Opaque

23.1 x 18 mm

$ 26.28

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9.35ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 9.31

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2.11ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 4.20

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2.69ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 5.36

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17.54ctw Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 17.47

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8.70ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 8.67

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2.19ctw Black Onyx, Round, Opaque

5.5 mm (calibrated)

$ 4.37

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19.19ct Black Onyx, Pear Shape, Opaque

25 x 18 mm (calibrated)

$ 19.11

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2.06ctw Black Onyx, Round, Opaque

6.5 mm (calibrated)

$ 4.10

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9.62ctw Black Onyx, Cushion, Opaque

11 x 11 mm (calibrated)

$ 9.58

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10.59ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 10.55

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4.31ct Black Onyx, Heart, Opaque

10.4 x 10.3 mm

$ 4.29

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4.46ct Black Onyx, Heart, Opaque

10.5 x 10.4 mm

$ 4.44

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2.48ctw Black Onyx, Round, Opaque

6.5 mm (calibrated)

$ 4.94

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9.38ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 9.35

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28.87ct Black Onyx, Oval, Opaque

27 x 20 mm (calibrated)

$ 28.75

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1.24ct Black Onyx, Round, Opaque

6.5 mm (calibrated)

$ 2.47

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8.50ctw Black Onyx, Heart, Opaque

10.4 x 10.4 mm

$ 8.47

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21.26ct Black Onyx, Pear Shape, Opaque

25 x 18 mm (calibrated)

$ 21.17

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4.20ct Black Onyx, Heart, Opaque

10 x 10 mm (calibrated)

$ 4.18

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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

Would have bought an indigo and selenite, but neither listed. But, you do offer quite a large assortment otherwise.

Posted By JD in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I was able to find what I've been looking for.

Posted By Tree Dog in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Found a rock that met my need. Bought it!

Posted By Skot in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Good selection, using for custom jewlery for my wife.

Posted By Smitty in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

A pleasant experience and many choices to choose from

Posted By Krackenking in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Great! Affordable

Posted By Spinellope in April, 2026
Source: Bizrate
Enlarged Gemstone Image