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

18.88ct Violet Amethyst, Round, VVS

18 mm (calibrated)

$ 131.63

View Gem

24.21ct Red Star Garnet, Oval, Opaque

16.6 x 13.9 mm

$ 23.87

View Gem

1.45ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 12.70

View Gem

3.44ctw Yellow Sillimanite, Oval, VS

9 x 7 mm (calibrated)

$ 85.06

View Gem

5.48ct Pink Kunzite, Oval, VS

12.4 x 8.8 mm

$ 136.45

View Gem

1.22ct Yellow Sillimanite, Oval, VS

7 x 5 mm (calibrated)

$ 46.78

View Gem

30.80ct White Rainbow Moonstone, Pear Shape, Translucent

22.8 x 22.5 mm

$ 214.74

View Gem

4.77ct Violet Amethyst, Pear Shape, Transparent

15.9 x 9.5 mm

$ 28.50

View Gem

115.48ct Brown Tiger'S Eye, Square, Opaque

28.5 x 27.9 mm

$ 67.10

View Gem

0.52ct Violet Amethyst, Emerald Cut, VS

6.2 x 4.2 mm

$ 3.02

View Gem

16.75ct White Agate, Round, Opaque

17 mm (calibrated)

$ 26.53

View Gem

3.41ctw Yellow Citrine, Square, VS

7 x 7 mm (calibrated)

$ 23.69

View Gem

17.96ct Multicolor Rhodochrosite, Fancy, Translucent

20.6 x 13.4 mm

$ 23.61

View Gem

7.15ctw Green Amazonite, Round, Opaque

7 mm (calibrated)

$ 17.46

View Gem

6.63ct Multicolor Ruby In Fuchsite, Marquise, Translucent

21.5 x 11.1 mm

$ 49.54

View Gem

0.68ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

5.9 x 4.7 mm

$ 20.86

View Gem

5.85ct Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 24.28

View Gem

29.78ct Brown Moonstone, Oval, Opaque

22.3 x 16.4 mm

$ 48.95

View Gem

1.00ct Yellow Beryl, Trillion, VVS

8 x 8 mm (calibrated)

$ 19.92

View Gem

1.86ct Green Sphene, Oval, Transparent

7.5 x 6.5 mm

$ 10.19

View Gem

0.85ctw Green Peridot, Pear Shape, VS

6 x 4 mm (calibrated)

$ 12.70

View Gem

25.09ct Brown Moonstone, Oval, Opaque

22.2 x 16.1 mm

$ 54.98

View Gem

1.02ct Red Rhodolite Garnet, Oval, VS-SI

7 x 5 mm (calibrated)

$ 21.47

View Gem

2.43ctw Orange Hessonite Garnet, Emerald Cut, VS-SI

7 x 5 mm (calibrated)

$ 53.24

View Gem
1 2 3
...
1482
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

Enjoy every moment

Posted By Ferns in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I have purchased stones from gem select in the past and have been very satisfied. I expect to repeat that experience with this purchase as well

Posted By Marti in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Enjoy viewing the selections. Excellent product

Posted By ToRa.62 in April, 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

Good selection, using for custom jewlery for my wife.

Posted By Smitty in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I was able to find what I wanted very easily!

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