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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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1.03ct Black Onyx, Round, Opaque

6.5 mm (calibrated)

$ 2.05

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4.56ct Black Onyx, Cushion, Opaque

11 x 11 mm (calibrated)

$ 9.08

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4.35ct Black Onyx, Heart, Opaque

10.5 x 10.3 mm

$ 4.33

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9.70ctw Black Onyx, Cushion, Opaque

11 x 11 mm (calibrated)

$ 9.66

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2.58ctw Black Onyx, Round, Opaque

7 mm (calibrated)

$ 5.14

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8.66ctw Black Onyx, Heart, Opaque

10.5 x 10.4 mm

$ 8.62

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19.53ct Black Onyx, Oval, Opaque

25 x 18 mm (calibrated)

$ 38.90

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8.69ctw Black Onyx, Heart, Opaque

10.5 x 10.4 mm

$ 8.66

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6.53ctw Black Onyx, Trillion, Opaque

9.9 x 9.4 mm

$ 6.51

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20.42ctw Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 20.34

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28.87ct Black Onyx, Oval, Opaque

27 x 20 mm (calibrated)

$ 28.75

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10.51ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 10.47

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8.18ctw Black Onyx, Oval, Opaque

13 x 11 mm (calibrated)

$ 16.29

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4.33ct Black Onyx, Heart, Opaque

10 x 10 mm (calibrated)

$ 4.32

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10.08ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 10.04

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4.46ct Black Onyx, Heart, Opaque

10.5 x 10.4 mm

$ 4.44

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4.50ct Black Onyx, Heart, Opaque

10.5 x 10.4 mm

$ 4.48

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9.35ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 9.31

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9.56ctw Black Onyx, Cushion, Opaque

11 x 11 mm (calibrated)

$ 9.52

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26.89ct Black Onyx, Pear Shape, Opaque

30.2 x 20.5 mm

$ 26.78

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19.41ct Black Onyx, Oval, Opaque

25 x 18 mm (calibrated)

$ 38.66

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10.14ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 10.10

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11.28ct Black Onyx, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 11.24

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4.46ct Black Onyx, Heart, Opaque

10.5 x 10.3 mm

$ 4.44

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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

Easy to use. No issues. Large selection of gems.

Posted By CLTCJH in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

My experience has always been fantastic. Today I saved 6 gems to email a customer looking for a particular color blend to fit into an east west setting, so her options were limited, but we found one she wanted, deleted all the others in the cart and order the gem she selected. It was helpful to be able to put them in the cart so I could save them until she selected the one she wanted without having to research all of them again.

Posted By RJ in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I had a very easy time navigating the web page and using filters to find what I was looking for. The varied selection was nice to see and pricing is clear and fair.

Posted By Mattick in May, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

It was fine

Posted By Na in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Enjoy every moment

Posted By Ferns in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I was looking for high-quality amethyst on this site, and I was able to compare size, color, and weight in detail before making a purchase.

Posted By Atsuhisa in January, 2026
Source: Bizrate
Enlarged Gemstone Image