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
4.86ct Multicolor Agate, Oval, Opaque

4.86ct Multicolor Agate, Oval, Opaque

12 x 10 mm (calibrated)

$ 4.60

View Gem
8.54ct Brown Smoky Quartz, Emerald Cut, VVS

8.54ct Brown Smoky Quartz, Emerald Cut, VVS

12 x 12 mm (calibrated)

$ 23.40

View Gem
1.57ct Violet Amethyst, Emerald Cut, VS-SI

1.57ct Violet Amethyst, Emerald Cut, VS-SI

7 x 7 mm (calibrated)

$ 12.51

View Gem
10.95ct Black Star Diopside, Round, Opaque

10.95ct Black Star Diopside, Round, Opaque

12 mm (calibrated)

$ 54.53

View Gem
8.76ct Brown Tiger'S Eye, Cushion, Opaque

8.76ct Brown Tiger'S Eye, Cushion, Opaque

14 x 12 mm (calibrated)

$ 8.72

View Gem
9.65ct Violet Amethyst, Pear Shape, VVS-VS

9.65ct Violet Amethyst, Pear Shape, VVS-VS

18 x 13 mm (calibrated)

$ 73.37

View Gem
4.97ct Green Uvarovite Garnet Drusy, Fancy, Opaque

4.97ct Green Uvarovite Garnet Drusy, Fancy, Opaque

13 x 9.5 mm

$ 16.17

View Gem
2.78ct Pink Strawberry Quartz, Oval, Transparent

2.78ct Pink Strawberry Quartz, Oval, Transparent

10 x 8 mm (calibrated)

$ 20.66

View Gem
1.30ctw Green Demantoid Garnet, Oval, VS

1.30ctw Green Demantoid Garnet, Oval, VS

4.3 x 3.6 mm

$ 142.43

View Gem
4.40ctw Yellow Citrine, Oval, VVS

4.40ctw Yellow Citrine, Oval, VVS

10 x 8 mm (calibrated)

$ 24.10

View Gem
1.24ct Gray Sillimanite Cat'S Eye, Oval, Transparent

1.24ct Gray Sillimanite Cat'S Eye, Oval, Transparent

7.5 x 5 mm

$ 3.92

View Gem
0.96ct Violet Amethyst, Marquise, VVS

0.96ct Violet Amethyst, Marquise, VVS

10 x 5 mm (calibrated)

$ 6.37

View Gem
14.01ct White Agate, Round, Opaque

14.01ct White Agate, Round, Opaque

16 mm (calibrated)

$ 22.19

View Gem
22.35ctw Green Aventurine, Fancy, Translucent

22.35ctw Green Aventurine, Fancy, Translucent

25.6 x 13 mm

$ 48.97

View Gem
0.81ct Green Tourmaline, Oval, VVS

0.81ct Green Tourmaline, Oval, VVS

6.7 x 5 mm

$ 40.34

View Gem
6.77ct Green Actinolite Cat'S Eye, Oval, Translucent

6.77ct Green Actinolite Cat'S Eye, Oval, Translucent

14.6 x 11.7 mm

$ 47.20

View Gem
9.98ct Brown Rutile Quartz, Pear Shape, Transparent

9.98ct Brown Rutile Quartz, Pear Shape, Transparent

18 x 13 mm (calibrated)

$ 27.12

View Gem
7.71ctw Multicolor Labradorite, Pear Shape, Translucent

7.71ctw Multicolor Labradorite, Pear Shape, Translucent

12 x 8 mm (calibrated)

$ 17.05

View Gem
0.99ct Green Tourmaline, Baguette, VVS

0.99ct Green Tourmaline, Baguette, VVS

8.3 x 3.7 mm

$ 34.51

View Gem
1.78ct Brown Color-Change Garnet, Oval, VVS-VS

1.78ct Brown Color-Change Garnet, Oval, VVS-VS

7.6 x 6.3 mm

$ 142.20

View Gem
29.95ct Multicolor Tiger'S Eye Matrix, Oval, Opaque

29.95ct Multicolor Tiger'S Eye Matrix, Oval, Opaque

28.9 x 18.9 mm

$ 29.83

View Gem
10.42ct Brown Tiger'S Eye, Oval, Opaque

10.42ct Brown Tiger'S Eye, Oval, Opaque

18 x 13 mm (calibrated)

$ 6.13

View Gem
28.79ctw Multicolor Jasper, Marquise, Opaque

28.79ctw Multicolor Jasper, Marquise, Opaque

31 x 12.9 mm

$ 47.31

View Gem
0.55ct Pink Spinel, Cushion, VVS

0.55ct Pink Spinel, Cushion, VVS

4.9 x 4.5 mm

$ 38.35

View Gem
1 2 3
...
768
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 -> 9 star ratings

Fast snd easy to find what I was looking for

Posted By Bawb in May, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

Site worked well and helped me find a rock that matched what I was looking for. Well within budget and I trust it will show up, so that's definitely positive. Not much else to it. Satisfied.

Posted By Big Ricky in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

hassle free experience.

Posted By Jhidron in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

All items were delivered on time with all items meeting or exceeding my expectations. Cut, clarity and color were very close to the photos and description.

Posted By Bob D in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I was able to find what I've been looking for.

Posted By Tree Dog in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Navigating the site was very easy and the photos of the exact gem you would be purchasing was well done.

Posted By HVeeder in February, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
Enlarged Gemstone Image