X
Gemstone Search
90,000+ Happy Customers
20+ Years In Business
Call Us Mon–Fri 8am–5pm

Your Details

Please fill in your email address

Please fill in a password

Forgot your password?

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
0.93ct Orange Hessonite Garnet, Cushion, VS-SI

0.93ct Orange Hessonite Garnet, Cushion, VS-SI

6 x 6 mm (calibrated)

$ 41.52

View Gem
69.39ct Multicolor Jasper, Oval, Opaque

69.39ct Multicolor Jasper, Oval, Opaque

45.5 x 29.1 mm

$ 40.09

View Gem
12.53ctw Black Star Diopside, Oval, Opaque

12.53ctw Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 52.00

View Gem
2.69ct Violet Amethyst, Trillion, VS

2.69ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 14.74

View Gem
14.27ctw Green Aventurine, Fancy, Translucent

14.27ctw Green Aventurine, Fancy, Translucent

12.2 x 14.5 mm

$ 23.69

View Gem
11.38ct White Rutile Quartz, Sphere / Ball, Translucent

11.38ct White Rutile Quartz, Sphere / Ball, Translucent

12 mm (calibrated)

$ 13.10

View Gem
23.44ct Gray Hematite, Marquise, Opaque

23.44ct Gray Hematite, Marquise, Opaque

24.5 x 11.3 mm

$ 22.86

View Gem
5.19ct Brown Tiger'S Eye, Oval, Opaque

5.19ct Brown Tiger'S Eye, Oval, Opaque

14 x 10 mm (calibrated)

$ 3.05

View Gem
29.56ctw Green Prehnite, Fancy, Translucent

29.56ctw Green Prehnite, Fancy, Translucent

16.9 x 12.5 mm

$ 48.57

View Gem
8.89ctw Black Spinel, Round, Opaque

8.89ctw Black Spinel, Round, Opaque

10 mm (calibrated)

$ 29.22

View Gem
4.45ct Multicolor Opal, Oval, Transparent

4.45ct Multicolor Opal, Oval, Transparent

14.4 x 11.1 mm

$ 110.81

View Gem
0.89ct Yellow Sphene, Oval, Transparent

0.89ct Yellow Sphene, Oval, Transparent

6.3 x 5.3 mm

$ 4.43

View Gem
14.32ct Orange Citrine, Fancy, VS
Citrine Product Video (751375)

14.32ct Orange Citrine, Fancy, VS

17 x 15.1 mm

$ 95.08

View Gem
4.03ctw Red Pyrope Garnet, Square, VS

4.03ctw Red Pyrope Garnet, Square, VS

4 x 4 mm (calibrated)

$ 30.91

View Gem
14.72ct Green Serpentine, Oval, Translucent

14.72ct Green Serpentine, Oval, Translucent

23.3 x 16.4 mm

$ 31.52

View Gem
2.00ct Orange Hessonite Garnet, Emerald Cut, VS-SI

2.00ct Orange Hessonite Garnet, Emerald Cut, VS-SI

8 x 6 mm (calibrated)

$ 33.40

View Gem
28.34ct Black Nuummite, Oval, Opaque

28.34ct Black Nuummite, Oval, Opaque

22.9 x 16.5 mm

$ 124.48

View Gem
2.32ctw Multicolor Andalusite, Oval, VS

2.32ctw Multicolor Andalusite, Oval, VS

5 x 3 mm (calibrated)

$ 123.94

View Gem
0.90ct Yellow Beryl, Oval, VS

0.90ct Yellow Beryl, Oval, VS

8 x 6 mm (calibrated)

$ 17.93

View Gem
2.12ct Yellow Citrine, Square, VVS

2.12ct Yellow Citrine, Square, VVS

8 x 8 mm (calibrated)

$ 12.40

View Gem
0.84ct Brown Tourmaline, Oval, Transparent

0.84ct Brown Tourmaline, Oval, Transparent

6.2 x 5.1 mm

$ 13.93

View Gem
2.13ct Yellow Citrine, Oval, VVS-VS

2.13ct Yellow Citrine, Oval, VVS-VS

10.7 x 6.5 mm

$ 16.33

View Gem
12.37ct Multicolor Labradorite, Pear Shape, Translucent

12.37ct Multicolor Labradorite, Pear Shape, Translucent

18 x 13 mm (calibrated)

$ 27.35

View Gem
1.78ctw Multicolor Andalusite, Oval, VS

1.78ctw Multicolor Andalusite, Oval, VS

5 x 3.1 mm

$ 95.08

View Gem
1 2 3
...
1507
Choose Page
1 - 1895

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 -> 7 star ratings

Easy, quick.

Posted By Mich in June, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

Good prices

Posted By TRM in October, 2025
Source: Bizrate

Overall Rating -> 8 star ratings

I've purchased things from GemSelect before. What you see is what you get, which is not always the case with gem sites online. You can find some good value with gem select, and I will buy from them again.

Posted By Meyeusername in March, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

I visited several online loose stone shops trying to find rare stones. I finally found one that I've been looking for here, and very satisfied. Looking forward to receive the item in 3 weeks.

Posted By Atsu in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

easy site to navigate

Posted By Curt's Cabochons in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Always get a nice gemstone. Just like the picture. Never disappointed

Posted By Ron T in June, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
Enlarged Gemstone Image