Best Onyx Loose Gemstones of 2026

John Zimmer Avatar
John Zimmer
Last Updated: 10 Feb 2026

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Onyx loose gemstones are a popular choice for jewellery making due to their sleek and sophisticated appearance. These gemstones are a type of chalcedony that come in a range of colours, including black, brown, grey, and white. Onyx is known for its smooth surface and fine texture, making it a desirable material for creating intricate designs. It is also believed to have healing properties, such as providing strength and stability during times of stress. Onyx loose gemstones can be purchased from various retailers and are a great addition to any jewellery collection.

At a Glance: Our Top Picks

Natural Brown Botswana Onyx Agate Loose Beads Cover #TOP 1
Natural Brown Botswana Onyx Agate Loose Beads
ftb score rating icon 9.9
GemsOnClick Natural Onyx Checker Stone Cover #TOP 2
GemsOnClick Natural Onyx Checker Stone
ftb score rating icon 9.8
Kirti Sales Natural Green Onyx Gemstone 8.25 Ratti Cover #TOP 3
Kirti Sales Natural Green Onyx Gemstone 8.25 Ratti
ftb score rating icon 9.6

Top 6 Onyx Loose Gemstones

Natural Brown Botswana Onyx Agate Loose Beads

GEM-INSIDE CREATE YOUR OWN FASHION
G18887
8x12mm
Natural Brown Botswana Onyx Agate Loose Beads Cover
Natural Brown Botswana Onyx Agate Gemstone 8x12mm Rice Olive Oval Loose Beads for Jewellery Making DIY Bracelet Necklace Crafts 15''

The GEM-INSIDE Beads are crafted from natural brown Botswana onyx agate, offering you a semi-precious material for all your jewellery-making needs. These versatile beads are perfect for creating stunning necklaces, bracelets, and earrings, allowing you to express your creativity. Being lead-free and nickel-free, you can enjoy peace of mind knowing that these beads are safe to use. They are ideal for various arts and crafts projects, making them a great choice for DIY gifts or home decorations.

What We Like
Natural semi-precious material
Versatile for various crafts
Safe and non-toxic
Ideal for DIY jewellery
#TOP 2

GemsOnClick Natural Onyx Checker Stone

GOCMMLGBON10
GemsOnClick Natural Onyx Checker Stone Cover
GemsOnClick 14X14 MM Natural Onyx Loose Gemstone Black Cushion Shape Checker Stone for Art and Craft

The GemsOnClick Onyx Gemstone is a genuine black onyx loose gemstone ideal for various creative projects. As a jeweller, jewellery maker, or designer, you will appreciate its quality and wholesale pricing, making it an excellent choice for bulk orders. This versatile gemstone is perfect for hobbyists and craftsmen alike, offering an elegant touch to your creations. Additionally, its unique properties make it a thoughtful gift for someone special, allowing you to express your creativity and personal style with ease.

What We Like
Genuine natural black onyx
Great for jewellery making
Affordable wholesale options
Perfect for gifting
#TOP 3

Kirti Sales Natural Green Onyx Gemstone 8.25 Ratti

Kirti Sales
green
Kirti Sales Natural Green Onyx Gemstone 8.25 Ratti Cover
Kirti Sales Green Onyx 8.25 Ratti Good Gemstone Natural Lab Tested, Gem, Onyx, Gem, Onyx, Gemstone, Onyx

The Kirti Sales Green Onyx is a certified lab-sealed natural gemstone, ensuring its quality and authenticity. You will appreciate that while the gemstone may have been treated to enhance its appearance and durability, it still requires special care to maintain its beauty. The colour may vary slightly depending on your monitor settings, providing a unique touch to each piece. With its oval mixed cut and specific refractive index, this gemstone is not only visually appealing but also a great addition to any collection.

What We Like
Certified natural gemstone
Unique oval mixed cut
Durable with special care
Attractive green colour
#TOP 4

Jewelryonclick Natural Black Onyx Oval Gemstone 12 Ct

JCBOXLG12
Black
Jewelryonclick Natural Black Onyx Oval Gemstone 12 Ct Cover
Jewelryonclick Black Onyx Stone 12 Ct Natural Original Oval Loose Gemstone

The Jewelryonclick Black Onyx is a natural gemstone that offers a genuine and original look, perfect for those seeking authenticity in their jewellery pieces. Its oval shape provides a classic and elegant design, making it versatile for various settings and styles. With a weight of 12 carats, this gemstone ensures a noticeable presence without being overwhelming. Additionally, it is 100% brand new and of high quality, so you can be confident in its condition and craftsmanship when you choose this stone for your collection or creation.

What We Like
Natural and original gemstone
Elegant oval shape
Noticeable 12 carat weight
High quality and brand new
#TOP 5

55Carat Natural Oval Onyx Loose Gemstone

55BOXLG12
Black
55Carat Natural Oval Onyx Loose Gemstone Cover
55Carat Onyx Stone 12 Carat Original Natural Oval Loose Gemstone Black

The 55Carat Onyx Gemstone is a natural oval-shaped loose gemstone offered at wholesale prices, making it an affordable choice for your jewellery projects. Whether you're an astrologer, jeweller, goldsmith, designer, or craftsman, this gemstone is ideal for creating unique pieces or for use in astrological purposes. It also makes a thoughtful gift for someone special. If you need larger quantities, bulk orders are available, ensuring convenience and cost savings on bigger purchases.

What We Like
Natural oval-shaped gemstone
Wholesale pricing available
Suitable for various uses
Ideal for gifts
#TOP 6

55Carat Natural Oval Onyx Loose Gemstone Black

55BOXLG8
Black
55Carat Natural Oval Onyx Loose Gemstone Black Cover
55Carat Onyx Stone Eight Carat Original Natural Oval Loose Gemstone Black

The 55Carat Onyx Gemstone is a natural oval-shaped loose gemstone, ideal for a variety of uses. Whether you are an astrologer, jeweller, jewellery maker, goldsmith, designer, craftsman, or collector, this gemstone suits your needs perfectly. It is also a thoughtful gift for someone special. You can benefit from wholesale rates when purchasing in bulk, making it convenient and affordable if you require multiple stones. Overall, the 55Carat Onyx Gemstone offers versatility and value for anyone working with gemstones.

What We Like
Natural oval shape gemstone
Suitable for many professionals
Wholesale pricing available
Ideal as a thoughtful gift
Buying Guide Image

Frequently Asked Questions (FAQs)

1. Are black onyx stones worth anything?

Black onyx can vary in value from $1 to $500 per carat on its own. That varies with the setting of the gemstone itself. With a setting of silver, it'll be less than a setting of yellow or white gold.

2. How much is onyx worth per gram?

The average price for natural black onyx is $40/carat ($10/gram) while synthetic costs about $6. A small black onyx with a low quality might cost around $5 per carat, while a high-quality large black onyx could cost up to $40 per carat or more.

3. How can you tell a real onyx stone?

There is one other way to test a black onyx, but it's advisable only for those who are willing to risk damaging the stone. Put the stone inside a small pouch of baggie and hit it with a little force with a hammer. The stone will break into pieces. If the insides of the pieces are shiny, then it's a fake stone.

4. Are onyx gems rare?

Onyx is relatively uncommon in nature. It is the striped, semiprecious variety of agate with white and black alternating bands.

Editor's Notes

During our onyx loose gemstone research, we found 73 onyx loose gemstone products and shortlisted 6 quality products. We collected and analyzed 2,284 customer reviews through our big data system to write the onyx loose gemstones list. We found that most customers choose onyx loose gemstones with an average price of £25.01.

The onyx loose gemstones are available for purchase. We have researched hundreds of brands and picked the top brands of onyx loose gemstones, including GEM-INSIDE CREATE YOUR OWN FASHION, GemsOnClick, Kirti Sales, Jewelryonclick, 55Carat.

Written by
John Zimmer Avatar

John Zimmer is a truly professional writer on findthisbest.com. He has specialized in writing content a wide variety of fields for over a decade. Since 2011, he has been using his expertise and extensive experience to write content for online shopping guide websites. In addition to writing for findthisbest.com, he has appeared in publications such as The Spruce, Wirecutter and Bestbuy.