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

0.77ct Yellow Color-Change Diaspore, Cushion, VS

6.5 x 5.2 mm

$ 40.65

View Gem

2.03ct Green Sphene, Oval, Transparent

8.2 x 6.9 mm

$ 11.12

View Gem

20.28ctw Multicolor Fossil Coral, Oval, Opaque

19.4 x 11.9 mm

$ 39.99

View Gem

1.60ctw Orange Zircon, Oval, VVS

6 x 4 mm (calibrated)

$ 39.84

View Gem

4.56ct Brown Smoky Quartz, Round, VS

11.5 mm

$ 7.49

View Gem

3.85ct Multicolor Dendritic Agate, Oval, Transparent

16.3 x 10.8 mm

$ 13.68

View Gem

1.36ct Orange Hessonite Garnet, Emerald Cut, VS-SI

7.3 x 5.1 mm

$ 20.22

View Gem

9.35ct White Rainbow Moonstone, Fancy, Transparent

17 x 10 mm

$ 167.63

View Gem

3.62ctw Orange Sunstone, Oval, Translucent

7 x 5 mm (calibrated)

$ 20.73

View Gem

9.39ctw Multicolor Pietersite, Oval, Opaque

14 x 10 mm (calibrated)

$ 41.15

View Gem

2.00ct Violet Amethyst, Heart, VVS

8 x 8 mm (calibrated)

$ 13.94

View Gem

0.78ct Yellow Color-Change Diaspore, Oval, VS

6.5 x 4.3 mm

$ 28.88

View Gem

9.24ct Brown Smoky Quartz, Emerald Cut, VVS

12 x 12 mm (calibrated)

$ 16.48

View Gem

15.04ct Black Tourmaline, Emerald Cut, Opaque

20.4 x 10.6 mm

$ 74.90

View Gem

2.44ct Orange Moonstone, Cushion, Translucent

9 x 7 mm (calibrated)

$ 4.86

View Gem

2.37ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 20.75

View Gem

2.96ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 19.46

View Gem

15.29ct White Rainbow Moonstone, Pear Shape, Translucent

20 x 15 mm (calibrated)

$ 106.61

View Gem

13.98ct Multicolor Agate, Fancy, Opaque

17 x 9.1 mm

$ 24.49

View Gem

25.62ctw Gray Hematite, Marquise, Opaque

23.7 x 11.2 mm

$ 24.98

View Gem

9.60ct Multicolor Coral, Pear Shape, Translucent

18.8 x 13.8 mm

$ 29.98

View Gem

1.52ct Purple Tourmaline, Round, Transparent

6.5 mm (calibrated)

$ 26.05

View Gem

0.64ct Purple Spinel, Round, VS

5 mm (calibrated)

$ 27.51

View Gem

22.41ct Multicolor Rainbow Moonstone, Fancy, Opaque

38.4 x 9 mm

$ 2.23

View Gem
1 2 3
...
1717
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 -> 10 star ratings

Very pleasant

Posted By Varun in June, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

Good prices

Posted By TRM in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Have made 2 purchases so far from GemSelect and they have been amazing! Anytime I requested additional info, videos or pictures of a particular item, the response was always timely and helpful. This is a great place to buy, if you are looking for loose stones. Highly recommend!

Posted By Britnee Rose in September, 2025
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

Overall Rating -> 7 star ratings

easy interface for a pricless buy

Posted By Zeak in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Love, and have always loved, your website.

Posted By Aberabic in July, 2025
Source: Bizrate
Enlarged Gemstone Image