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
12.97ctw Black Spinel, Heart, Opaque

12.97ctw Black Spinel, Heart, Opaque

12 x 12 mm (calibrated)

$ 71.06

View Gem
1.19ct Yellow Sphene, Round, VS-SI
Sphene Product Video (526305)

1.19ct Yellow Sphene, Round, VS-SI

6.5 mm (calibrated)

$ 71.71

View Gem
0.97ct Yellow Color-Change Diaspore, Emerald Cut, VS

0.97ct Yellow Color-Change Diaspore, Emerald Cut, VS

6.3 x 4.6 mm

$ 36.02

View Gem
23.41ct Green Cat'S Eye Aquamarine, Oval, Translucent
Cat's Eye Aquamarine Product Video (363233)

23.41ct Green Cat'S Eye Aquamarine, Oval, Translucent

17.3 x 14.6 mm

$ 396.37

View Gem
5.96ct Violet Amethyst, Round, Transparent

5.96ct Violet Amethyst, Round, Transparent

12 mm (calibrated)

$ 41.55

View Gem
3.84ctw Orange Hessonite Garnet, Square, VS

3.84ctw Orange Hessonite Garnet, Square, VS

6.7 x 6.6 mm

$ 84.15

View Gem
3.30ctw Yellow Citrine, Square, VS

3.30ctw Yellow Citrine, Square, VS

7 x 7 mm (calibrated)

$ 22.92

View Gem
3.77ct Brown Moonstone, Flower Cut, Translucent

3.77ct Brown Moonstone, Flower Cut, Translucent

13 x 13 mm (calibrated)

$ 16.53

View Gem
1.54ct Yellow Diamond, Round, SI
Diamond Product Video (378641)

1.54ct Yellow Diamond, Round, SI

7 mm (calibrated)

$ 4,386.78

View Gem
3.36ct Violet Amethyst, Oval, Transparent

3.36ct Violet Amethyst, Oval, Transparent

10.6 x 8.7 mm

$ 20.08

View Gem
6.93ct Green Prehnite, Cushion, Translucent

6.93ct Green Prehnite, Cushion, Translucent

12 x 12 mm (calibrated)

$ 34.16

View Gem
1.86ct Pink Strawberry Quartz, Round, Translucent

1.86ct Pink Strawberry Quartz, Round, Translucent

7 mm (calibrated)

$ 11.37

View Gem
8.83ct Pink Strawberry Quartz, Oval, Translucent

8.83ct Pink Strawberry Quartz, Oval, Translucent

16 x 12 mm (calibrated)

$ 53.02

View Gem
5.92ct Violet Amethyst, Oval, Transparent

5.92ct Violet Amethyst, Oval, Transparent

13.2 x 11.4 mm

$ 34.40

View Gem
64.77ct Multicolor Jasper, Oval, Opaque

64.77ct Multicolor Jasper, Oval, Opaque

45.8 x 27.8 mm

$ 26.62

View Gem
5.56ctw Orange Hessonite Garnet, Emerald Cut, VS-SI
Hessonite Garnet Product Video (398839)

5.56ctw Orange Hessonite Garnet, Emerald Cut, VS-SI

7 x 5 mm (calibrated)

$ 121.83

View Gem
24.65ct Brown Moonstone, Round, Translucent

24.65ct Brown Moonstone, Round, Translucent

18 mm (calibrated)

$ 49.10

View Gem
2.38ct Turquoise Fluorite, Pear Shape, Transparent

2.38ct Turquoise Fluorite, Pear Shape, Transparent

10.9 x 6.4 mm

$ 9.48

View Gem
4.30ctw Orange Sunstone, Oval, Transparent

4.30ctw Orange Sunstone, Oval, Transparent

10 x 8 mm (calibrated)

$ 27.48

View Gem
26.24ctw Multicolor Fossil Coral, Oval, Opaque

26.24ctw Multicolor Fossil Coral, Oval, Opaque

21.3 x 13.2 mm

$ 33.92

View Gem
97.36ctw Purple Tourmaline, Fancy, Translucent
Tourmaline Product Video (666911)

97.36ctw Purple Tourmaline, Fancy, Translucent

43.6 x 29.3 mm

$ 1,454.56

View Gem
3.65ctw Orange Hessonite Garnet, Square, VS

3.65ctw Orange Hessonite Garnet, Square, VS

6.7 x 6.7 mm

$ 79.98

View Gem
1.20ct Brown Tiger'S Eye, Marquise, Opaque

1.20ct Brown Tiger'S Eye, Marquise, Opaque

10 x 5 mm (calibrated)

$ 1.55

View Gem
2.15ct Orange Hessonite Garnet, Emerald Cut, VS

2.15ct Orange Hessonite Garnet, Emerald Cut, VS

8 x 6 mm (calibrated)

$ 35.91

View Gem
1 2 3
...
42
Choose Page
1 - 1897

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

It was easy to navigate

Posted By GemGod in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

GemSelect offers excellent choices, prices & service- highly recommended! Unfortunately, prior to ordering a replacement gemstone, my jeweler neglected to mention it needed to be one that was a'cushion cuta' to fit the existing mount. Have yet to return/exchangea'

Posted By CJ in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Had a great experience and the prices are great

Posted By BuBx99 in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very large selection from affordable to high end I will be coming back to shop again!

Posted By GreenGator in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I liked the selection of gems, and price. I did not like your PayPal process. I already have a PP account and you want me to sign up for another.

Posted By CLTCJH in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Gem Select has a user friendly website and the product is very good as is the price. The gems are described accurately and I always get what I think I'm getting.

Posted By Happy Customer in June, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
Enlarged Gemstone Image