90,000+Happy Customers
20+Years
WorldwideShipping
Cart
Free Report Included
Worldwide Shipping
30 Day Returns
Help Center Shipping Payment and Checkout Returns Certificates Contact Us
Home Gemstones Untreated Gemstones

Untreated Gemstones

Browse our selection of untreated gemstones featuring natural color, clarity and beauty without enhancements.

Untreated Gemstones Weight
Untreated Gemstones Size
Untreated Gemstones Clarity
Untreated Gemstones Price
Untreated Gemstones Treatment

Size Explained

Choose Size or Size Range
For Example: 6-7
For Example: 8-9
Bi-color Untreated Gemstones
Black Untreated Gemstones
Blue Untreated Gemstones
Brown Untreated Gemstones
Golden Untreated Gemstones
Gray Untreated Gemstones
Green Untreated Gemstones
Multicolor Untreated Gemstones
Orange Untreated Gemstones
Pink Untreated Gemstones
Purple Untreated Gemstones
Red Untreated Gemstones
Turquoise Untreated Gemstones
Violet Untreated Gemstones
White Untreated Gemstones
Yellow Untreated Gemstones
Single
Pairs
Lots
Faceted
Cabochons
Clear All

2.94ct Green Prehnite, Oval, Transparent/Translucent

8.8 x 7.7 mm

$ 8.70

View Gem

33.41ct Multicolor Jasper, Cushion, Opaque

27.6 x 23.4 mm

$ 27.46

View Gem

1.64ct Gray Sillimanite Cat'S Eye, Oval, Transparent

7.7 x 5.4 mm

$ 5.39

View Gem

3.48ct Multicolor Labradorite, Round, Translucent

9 mm (calibrated)

$ 8.46

View Gem

11.67ct Multicolor Agate, Fancy, Translucent

17.9 x 8.3 mm

$ 20.43

View Gem

30.80ctw Multicolor Fossil Coral, Cushion, Opaque

18.8 x 13.3 mm

$ 36.45

View Gem

2.17ct Green Sphene, Oval, Translucent

7.6 x 7.1 mm

$ 10.81

View Gem

5.06ct Pink Rose Quartz, Round, Transparent

12 mm (calibrated)

$ 20.13

View Gem

0.93ct Pink Morganite, Round, VS

7 mm (calibrated)

$ 36.12

View Gem

4.82ct Yellow Citrine, Emerald Cut, VVS-VS

11 x 9 mm (calibrated)

$ 36.96

View Gem

0.49ct Orange Spessartite Garnet, Oval, VS

5 x 4 mm (calibrated)

$ 14.64

View Gem

6.34ct Brown Moonstone, Oval, Translucent

13 x 9 mm (calibrated)

$ 13.69

View Gem

0.58ct Purple Spinel, Round, VVS-VS

5 mm (calibrated)

$ 30.42

View Gem

5.50ct Multicolor Opal, Pear Shape, Transparent

16.8 x 11.1 mm

$ 246.51

View Gem

2.77ct Purple Tourmaline, Oval, Transparent

10 x 8 mm (calibrated)

$ 82.77

View Gem

115.90ct Violet Amethyst, Square, Opaque

27.6 x 27.6 mm

$ 96.20

View Gem

0.62ct Yellow Citrine, Pear Shape, VVS

7 x 5 mm (calibrated)

$ 3.09

View Gem

58.28ctw Gray Hematite, Pear Shape, Opaque

23.7 x 19 mm

$ 56.83

View Gem

18.72ct Pink Rose Quartz, Oval, Transparent

20.4 x 13.3 mm

$ 41.02

View Gem

1.38ctw Violet Amethyst, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 6.30

View Gem

7.14ctw White Moonstone, Round, Translucent

9 mm (calibrated)

$ 19.56

View Gem

0.47ctw Blue Kyanite, Round, VS-SI

3.7 mm

$ 8.42

View Gem

147.86ct Violet Amethyst, Oval, VVS

42.5 x 28.4 mm

$ 1,840.86

View Gem

2.91ctw White Topaz, Cushion, VVS-VS

4.6 x 4.6 mm

$ 15.94

View Gem
1 2 3
...
881
Choose Page
1 - 1896

Why Buy Untreated Gemstones from GemSelect?

Natural Untreated Gemstones

Our untreated gemstones are completely natural and have not undergone any enhancement processes. These gems display their original color and clarity as formed in nature, making them highly valued by collectors, jewelers, and gemstone enthusiasts.

Buy Untreated Gemstones Online

At GemSelect you can easily shop untreated gemstones online with confidence. Our inventory includes carefully sourced loose gemstones from around the world, with full transparency regarding treatments and gem origins.

Natural Untreated Loose Gemstones

Why Choose Untreated Gems?

Untreated gems are prized because they remain exactly as nature created them. Without heat or chemical treatments, these stones offer rarity and authenticity that many collectors and jewelry designers prefer.

Unheated Sapphire and Ruby

Some of the most sought-after untreated gemstones include unheated sapphire and ruby. These rare stones retain their natural color and are highly valued due to the absence of heat treatment commonly used to enhance corundum.

Gemstone Authenticity and Transparency

Every gemstone at GemSelect comes with clear treatment disclosure. When purchasing untreated stones, buyers can be confident they are receiving authentic gems that have not been altered by heat or other enhancement methods.

Untreated Gems for Custom Jewelry

Natural untreated gemstones are perfect for custom jewelry pieces. Their unique appearance ensures every ring, pendant, or pair of earrings features a one-of-a-kind gemstone created by nature.

Rare and Collectible Gemstones

Because many gemstones are routinely treated, truly untreated examples can be relatively rare. Collectors often seek untreated stones because they represent the most natural state of a gemstone.

Learn more about gemstone treatments and natural gem formation on our Gemstone Treatment Guide.

FAQs

What are untreated gemstones?

Untreated gemstones are natural gems that have not been enhanced with heat, chemicals, irradiation, or other treatments. They retain their original appearance as formed in nature.

Are untreated gemstones more valuable?

In many cases untreated gemstones are more valuable because they are rarer than treated stones. Natural color without enhancement is highly prized by collectors and investors.

How can I tell if a gemstone is untreated?

Gemstone treatment is typically determined through gemological testing. Reputable sellers like GemSelect clearly disclose whether a stone is untreated or has received any enhancements.

Which gemstones are commonly untreated?

Some gemstones frequently found untreated include garnet, spinel, peridot, and certain sapphires. However, many gem types may be treated depending on their origin and quality.

Are untreated gemstones suitable for jewelry?

Yes, untreated gemstones can be excellent for jewelry depending on their hardness and durability. Popular choices include sapphire, ruby, spinel, and garnet.

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

Good, hope gem quality is good and genuine

Posted By Varun in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Filters need to be improved but rest of website is great

Posted By Rock hound in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.

Posted By Tim W in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

It was good. There was a large selection at prices I could afford.

Posted By Zorah in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I loved it! Extensive inventory, great prices, I definitely will be buying from here again!

Posted By Lex in April, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

It was fine . Wish there had been more round stones to select from

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