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
13.76ct Green Maw-Sit-Sit, Round, Opaque

13.76ct Green Maw-Sit-Sit, Round, Opaque

12 mm (calibrated)

$ 45.23

View Gem
1.65ctw Green Demantoid Garnet, Oval, VS

1.65ctw Green Demantoid Garnet, Oval, VS

4.8 x 3.9 mm

$ 180.77

View Gem
2.35ct Yellow Beryl, Round, VVS

2.35ct Yellow Beryl, Round, VVS

9 mm (calibrated)

$ 51.49

View Gem
1.03ct Green Tourmaline, Emerald Cut, VVS

1.03ct Green Tourmaline, Emerald Cut, VVS

5.3 x 5.2 mm

$ 51.29

View Gem
2.03ct Orange Hessonite Garnet, Cushion, VS-SI

2.03ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 38.33

View Gem
0.47ct Yellow Citrine, Heart, VVS-VS

0.47ct Yellow Citrine, Heart, VVS-VS

5 x 5 mm (calibrated)

$ 3.74

View Gem
8.59ct Black Star Diopside, Round, Opaque

8.59ct Black Star Diopside, Round, Opaque

11 mm (calibrated)

$ 42.78

View Gem
4.78ct Turquoise Fluorite, Pear Shape, Transparent

4.78ct Turquoise Fluorite, Pear Shape, Transparent

14 x 8.2 mm

$ 20.38

View Gem
14.30ct Violet Amethyst, Emerald Cut, VVS
Amethyst Product Video (713705)

14.30ct Violet Amethyst, Emerald Cut, VVS

18 x 13 mm (calibrated)

$ 99.70

View Gem
37.66ct Green Idocrase, Oval, Opaque

37.66ct Green Idocrase, Oval, Opaque

30.8 x 23.2 mm

$ 18.76

View Gem
4.66ct Multicolor Pietersite, Pear Shape, Opaque

4.66ct Multicolor Pietersite, Pear Shape, Opaque

16.1 x 9.5 mm

$ 11.00

View Gem
0.51ct Blue Kyanite, Round, SI

0.51ct Blue Kyanite, Round, SI

4.5 mm (calibrated)

$ 12.70

View Gem
14.13ct Brown Moonstone, Fancy, Translucent

14.13ct Brown Moonstone, Fancy, Translucent

20 x 15 mm (calibrated)

$ 16.25

View Gem
1.81ct Orange Tourmaline, Oval, VVS
Tourmaline Product Video (747874)

1.81ct Orange Tourmaline, Oval, VVS

7.2 x 7.1 mm

$ 270.41

View Gem
19.58ct Multicolor Jasper, Oval, Opaque

19.58ct Multicolor Jasper, Oval, Opaque

25 x 18 mm (calibrated)

$ 32.18

View Gem
2.26ct Green Peridot, Cushion, VS

2.26ct Green Peridot, Cushion, VS

8.1 x 7.6 mm

$ 80.58

View Gem
1.30ctw Red Pyrope Garnet, Heart, VS

1.30ctw Red Pyrope Garnet, Heart, VS

5.3 x 5.1 mm

$ 10.36

View Gem
1.27ct Yellow Color-Change Diaspore, Pear Shape, VS-SI

1.27ct Yellow Color-Change Diaspore, Pear Shape, VS-SI

9.3 x 5.6 mm

$ 67.68

View Gem
1.45ct Purple Tourmaline, Oval, VS
Tourmaline Product Video (747433)

1.45ct Purple Tourmaline, Oval, VS

8.1 x 6.3 mm

$ 216.63

View Gem
2.78ct Yellow Sphene, Oval, Transparent

2.78ct Yellow Sphene, Oval, Transparent

8.3 x 7 mm

$ 13.84

View Gem
1.56ct Orange Hessonite Garnet, Emerald Cut, VS

1.56ct Orange Hessonite Garnet, Emerald Cut, VS

6 x 6 mm (calibrated)

$ 30.77

View Gem
74.15ctw Multicolor Rhodochrosite, Sphere / Ball, Opaque

74.15ctw Multicolor Rhodochrosite, Sphere / Ball, Opaque

15.8 mm

$ 162.48

View Gem
27.16ct Multicolor Agate, Fancy, Opaque

27.16ct Multicolor Agate, Fancy, Opaque

21.2 x 12.3 mm

$ 47.57

View Gem
1.44ct Green Tourmaline, Emerald Cut, VS

1.44ct Green Tourmaline, Emerald Cut, VS

16.2 x 3.9 mm

$ 37.86

View Gem
1 2 3
...
260
Choose Page
1 - 1876

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

Good, hope gem quality is good and genuine

Posted By Varun in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I purchased 4 gemstones in different sizes to be able to make a family ring for my granddaughter. I got exactly what I saw and they are absolutely beautiful! Shipping was quick compared to other gem stores I have dealt with! I will definitely order more stones from your company, as I am a collector and have several stones. You are my new go to company in the future

Posted By Liz in June, 2026
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

Web site is very simple to navigate Selection is terrific

Posted By ToRa.62 in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Very good place to buy gemstones

Posted By Elansary in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Recomendado Totalmente Los Productos Se Entregaron A Tiempo

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