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Buy Onyx Gemstones

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Onyx
Onyx is the black form of chalcedony, a cryptocrystalline form of quartz. Onyx naturally occurs in bands of black and white, and is typically dyed to produce the familiar jet black cabochons.
Certified Customer Reviews
Overall Rating -> 10 star ratings
man their gems are pretty good, and the prices aren't to bad either, I like checking out hte gems on there website, beceause the pictures of the gems are taken pretty well, and you can see the table, and the facets.
Posted By Spinach in March, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
I love gemselect and I have bought a fair amount from them. The only complaint I have is not being able to save gems. I have a lot of projects so i am in the market for a lot of different gems and it's so disappointing to have to delete them all just to purchase one or two that I have saved in my cart.
Posted By S.Hicks in March, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
I always check this site because they have unique options.
Posted By Lisa in February, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
Great website to navigate. Awesome Gem selection! Nice photos and discriptions for all of the gems for sale. You can find gems in all price ranges. Checkout was a breeze.
Posted By Timmy in February, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
They had an extensive gemstone selection in all different cuts, sizes, and colors. They also had very good and workable prices. All of these aspects pulled me in as a customer.
Posted By Josh in February, 2019
Source: Bizrate
Overall Rating -> 9 star ratings
It all depend on the product I will receive and have it verified by my in law jewellers.
Posted By Vodka in February, 2019
Source: Bizrate
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More Shapes
  • Asscher Cut
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  • Drilled Faceted Sphere
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  • Drop / Pear
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  • Half-Drilled Briolette
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  • Heart Rose-Cut
  • Hexagon Cut
  • Marquise Buff-Top
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  • Round Checkerboard (double sided)
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  • Round Concave Cut
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  • Undrilled Briolette Teardrop
Popular Gemstones
  		•  Sapphire
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  		• Citrine
  		• Tanzanite
All Gemstones (145)
A B C D E F G H I J K L M N O P Q R S T V Z
    A Back to Top
  		•  Actinolite Cat's Eye
  		• Agate
  		• Agate Geode
  		• Almandine Garnet
  		• Amazonite
  		• Amethyst
  		• Amethyst Geode
  		• Ametrine
  		• Ammolite
  		• Andalusite
  		• Andesine Labradorite
  		• Apatite
  		• Aquamarine
  		• Aventurine
    • B Back to Top
  		•  Beryl
  		• Black Opal
  		• Bloodstone
  		• Boulder Opal
    • C Back to Top
  		•  Calcite
  		• Carnelian
  		• Cat's Eye Apatite
  		• Cat's Eye Aquamarine
  		• Cat's Eye Augite
  		• Cat's Eye Gemstones
  		• Cat's Eye Moonstone
  		• Cat's Eye Opal
  		• Cat's Eye Scapolite
  		• Chalcedony
  		• Charoite
  		• Chocolate Opal
  		• Chrome Diopside
  		• Chrome Tourmaline
  		• Chrysoberyl
  		• Chrysocolla
  		• Chrysoprase
  		• Citrine
  		• Citrine Geode
  		• Clinohumite
  		• Color-Change Diaspore
  		• Color-Change Fluorite
  		• Color-Change Garnet
  		• Color-Change Sapphire
  		• Coral
    • D Back to Top
  		•  Demantoid Garnet
  		• Dendritic Agate
  		• Diamond
  		• Druzy Azurite
    • E Back to Top
  		•  Emerald
  		• Enstatite
    • F Back to Top
  		•  Fire Agate
  		• Fire Opal
  		• Fluorite
  		• Fossil Coral
    • G Back to Top
  		•  Garnet
  		• Golden Beryl
  		• Grandidierite
  		• Grossularite Garnet
    • H Back to Top
  		•  Hawk's Eye
  		• Hematite
  		• Hemimorphite Druzy
  		• Hessonite Garnet
  		• Hiddenite
  		• Howlite
    • I Back to Top
  		•  Idocrase
  		• Imperial Topaz
  		• Iolite
    • J Back to Top
  		•  Jade Gemstones
  		• Jadeite
  		• Jasper
    • K Back to Top
  		•  Kornerupine
  		• Kunzite
  		• Kyanite
    • L Back to Top
  		•  Labradorite
  		• Lapis Lazuli
  		• Larimar
    • M Back to Top
  		•  Malachite
  		• Malaya Garnet
  		• Mali Garnet
  		• Maw-Sit-Sit
  		• Moonstone
  		• Morganite
  		• Moss Opal
  		• Mother of Pearl
  		• Mystic Quartz
  		• Mystic Topaz
    • N Back to Top
  		•  Nuummite
    • O Back to Top
  		•  Obsidian
  		• Opal
  		• Opal Doublet
  		• Opal in Matrix
    • P Back to Top
  		•  Pearl
  		• Peridot
  		• Pietersite
  		• Prehnite
  		• Pyrite
  		• Pyrope Garnet
    • Q Back to Top
  		•  Quartz
  		• Quartz Cat's Eye
  		• Quartz With Marcasite
    • R Back to Top
  		•  Rainbow Moonstone
  		• Rainbow Pyrite
  		• Rhodochrosite
  		• Rhodolite Garnet
  		• Rhodonite
  		• Rose Quartz
  		• Ruby
  		• Ruby in Fuchsite
  		• Ruby-Zoisite
  		• Rutile Quartz
    • S Back to Top
  		•  Sapphire
  		• Scolecite
  		• Seraphinite
  		• Serpentine
  		• Sillimanite
  		• Sillimanite Cat's Eye
  		• Smithsonite
  		• Smoky Quartz
  		• Snowflake Obsidian
  		• Sodalite
  		• Spectrolite
  		• Spessartite Garnet
  		• Sphalerite
  		• Sphene
  		• Spinel
  		• Star Diopside
  		• Star Garnet
  		• Star Gemstones
  		• Star Lemon Quartz
  		• Star Moonstone
  		• Star Rose Quartz
  		• Star Ruby
  		• Star Sapphire
  		• Star Sunstone
  		• Strawberry Quartz
  		• Sugilite
  		• Sunstone
    • T Back to Top
  		•  Tanzanite
  		• Tiger's Eye
  		• Tiger's Eye Matrix
  		• Topaz
  		• Tourmaline
  		• Tsavorite Garnet
  		• Turquoise
    • V Back to Top
  		•  Variscite
    • Z Back to Top
  		•  Zircon
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart