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
1.24ct Pink Morganite, Pear Shape, VVS

1.24ct Pink Morganite, Pear Shape, VVS

8.1 x 6.7 mm

$ 108.68

View Gem
4.34ct Orange Sunstone, Oval, Translucent

4.34ct Orange Sunstone, Oval, Translucent

12 x 10 mm (calibrated)

$ 25.91

View Gem
12.85ctw Green Prehnite, Fancy, Translucent

12.85ctw Green Prehnite, Fancy, Translucent

16.5 x 11.4 mm

$ 21.12

View Gem
52.92ct Multicolor Jasper, Oval, Opaque

52.92ct Multicolor Jasper, Oval, Opaque

36.3 x 29.5 mm

$ 43.48

View Gem
1.97ctw Yellow Citrine, Heart, VS

1.97ctw Yellow Citrine, Heart, VS

7.1 x 57 mm

$ 15.11

View Gem
25.62ct Green Bloodstone, Pear Shape, Opaque

25.62ct Green Bloodstone, Pear Shape, Opaque

25 x 18 mm (calibrated)

$ 38.28

View Gem
2.61ct Blue Chalcedony, Oval, Transparent

2.61ct Blue Chalcedony, Oval, Transparent

10 x 8 mm (calibrated)

$ 5.20

View Gem
1.12ctw Red Pyrope Garnet, Heart, VVS-VS

1.12ctw Red Pyrope Garnet, Heart, VVS-VS

5 x 5 mm (calibrated)

$ 27.89

View Gem
7.95ct Multicolor Boulder Opal, Oval, Opaque

7.95ct Multicolor Boulder Opal, Oval, Opaque

18.3 x 9.9 mm

$ 55.43

View Gem
1.85ct Yellow Citrine, Trillion, VVS

1.85ct Yellow Citrine, Trillion, VVS

9 x 9 mm (calibrated)

$ 14.19

View Gem
4.74ctw Yellow Citrine, Oval, VVS-VS

4.74ctw Yellow Citrine, Oval, VVS-VS

9.6 x 7.8 mm

$ 25.96

View Gem
2.85ct Violet Amethyst, Trillion, VVS-VS

2.85ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 22.71

View Gem
2.40ct Pink Strawberry Quartz, Round, Translucent

2.40ct Pink Strawberry Quartz, Round, Translucent

9 mm (calibrated)

$ 14.67

View Gem
0.58ct Violet Spinel, Round, VVS-VS

0.58ct Violet Spinel, Round, VVS-VS

5 mm (calibrated)

$ 29.07

View Gem
16.29ct Green Amazonite, Oval, Opaque

16.29ct Green Amazonite, Oval, Opaque

24.8 x 18.6 mm

$ 16.55

View Gem
2.39ctw Violet Amethyst, Oval, VVS-VS

2.39ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 13.10

View Gem
9.81ctw Orange Sunstone, Round, Translucent

9.81ctw Orange Sunstone, Round, Translucent

9 mm (calibrated)

$ 58.03

View Gem
2.80ctw Violet Amethyst, Oval, VS

2.80ctw Violet Amethyst, Oval, VS

7 x 5 mm (calibrated)

$ 15.34

View Gem
1.26ctw Green Demantoid Garnet, Oval, VS-SI

1.26ctw Green Demantoid Garnet, Oval, VS-SI

4.8 x 3.9 mm

$ 138.05

View Gem
1.17ct White Sillimanite Cat'S Eye, Oval, Transparent

1.17ct White Sillimanite Cat'S Eye, Oval, Transparent

7.3 x 4.8 mm

$ 3.64

View Gem
17.57ctw Green Prehnite, Flower Cut, Translucent

17.57ctw Green Prehnite, Flower Cut, Translucent

18.8 x 12.8 mm

$ 26.58

View Gem
28.98ctw Brown Rutile Quartz, Sphere / Ball, Transparent

28.98ctw Brown Rutile Quartz, Sphere / Ball, Transparent

13 mm (calibrated)

$ 31.76

View Gem
0.76ct Green Tourmaline, Oval, Transparent

0.76ct Green Tourmaline, Oval, Transparent

6.3 x 5.1 mm

$ 15.14

View Gem
0.09ctw Black Diamond, Round, Opaque

0.09ctw Black Diamond, Round, Opaque

2.2 mm (calibrated)

$ 40.79

View Gem
1 2 3
...
1247
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 -> 10 star ratings

My experience was done with ease

Posted By Barb in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

this site is awesome. I was able to look at the products think about purchasing and come back and find the same products. With the amount of inventory gem select has. Its awesome to be able to filter the way that they allow you too.

Posted By Tommyp in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very food

Posted By Keeto in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The stones are very nice.

Posted By Mvk in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Easy process.

Posted By Crafty Seabee in March, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
Enlarged Gemstone Image