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Untreated Gemstones

Browse our selection of untreated gemstones featuring natural color, clarity and beauty without enhancements.

Untreated Gemstones Weight
Untreated Gemstones Size
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0.55ct Green Tourmaline, Baguette, VVS

0.55ct Green Tourmaline, Baguette, VVS

17 x 2.2 mm

$ 15.98

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2.05ct Orange Sunstone, Round, Translucent

2.05ct Orange Sunstone, Round, Translucent

8.5 mm (calibrated)

$ 12.26

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2.43ctw Red Rhodolite Garnet, Square, VS

2.43ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 21.27

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26.26ctw Green Prehnite, Fancy, Translucent

26.26ctw Green Prehnite, Fancy, Translucent

15.7 x 10.2 mm

$ 43.16

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6.24ctw Brown Tiger'S Eye, Oval, Opaque

6.24ctw Brown Tiger'S Eye, Oval, Opaque

10 x 8 mm (calibrated)

$ 6.22

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8.18ct Yellow Citrine, Briolette, VVS

8.18ct Yellow Citrine, Briolette, VVS

16 x 9.1 mm

$ 38.46

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14.42ct White Agate, Fancy, Opaque

14.42ct White Agate, Fancy, Opaque

18.1 x 16.3 mm

$ 22.84

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1.39ctw Yellow Citrine, Pear Shape, VVS-VS

1.39ctw Yellow Citrine, Pear Shape, VVS-VS

7 x 5 mm (calibrated)

$ 9.13

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0.80ct Pink Morganite, Cushion, VVS-VS

0.80ct Pink Morganite, Cushion, VVS-VS

8 x 4.8 mm

$ 48.21

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58.45ct Multicolor Quartz With Marcasite, Fancy, Translucent
Quartz With Marcasite Product Video (617887)

58.45ct Multicolor Quartz With Marcasite, Fancy, Translucent

43.4 x 18.9 mm

$ 320.20

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35.26ct Green Idocrase, Oval, Opaque

35.26ct Green Idocrase, Oval, Opaque

32.2 x 22 mm

$ 17.56

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9.05ct Black Tourmaline, Emerald Cut, Opaque

9.05ct Black Tourmaline, Emerald Cut, Opaque

16.8 x 9.7 mm

$ 45.07

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33.81ct Multicolor Jasper, Pear Shape, Opaque

33.81ct Multicolor Jasper, Pear Shape, Opaque

29.1 x 25.1 mm

$ 20.73

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2.82ct Violet Amethyst, Trillion, VS

2.82ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 22.47

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1.18ct Purple Spinel, Cushion, VS

1.18ct Purple Spinel, Cushion, VS

6.4 x 5.5 mm

$ 117.53

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14.30ct Brown Smoky Quartz, Round, VVS-VS

14.30ct Brown Smoky Quartz, Round, VVS-VS

16 mm (calibrated)

$ 17.39

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1.22ct Purple Spinel, Cushion, VVS-VS

1.22ct Purple Spinel, Cushion, VVS-VS

6 x 6 mm (calibrated)

$ 84.21

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5.24ctw Brown Moonstone, Flower Cut, Translucent

5.24ctw Brown Moonstone, Flower Cut, Translucent

9 x 9 mm (calibrated)

$ 22.97

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5.16ctw Green Prehnite, Oval, Transparent/Translucent

5.16ctw Green Prehnite, Oval, Transparent/Translucent

9.2 x 7.8 mm

$ 15.26

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1.18ct Green Tourmaline, Emerald Cut, VVS-VS

1.18ct Green Tourmaline, Emerald Cut, VVS-VS

21.6 x 2.6 mm

$ 32.32

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9.62ct Brown Tiger'S Eye, Oval, Opaque

9.62ct Brown Tiger'S Eye, Oval, Opaque

18 x 13 mm (calibrated)

$ 9.58

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1.67ct Multicolor Opal, Oval, Transparent

1.67ct Multicolor Opal, Oval, Transparent

11.1 x 8.5 mm

$ 41.58

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3.69ctw Purple Rhodolite Garnet, Marquise, VS

3.69ctw Purple Rhodolite Garnet, Marquise, VS

9.7 x 4.5 mm

$ 80.86

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4.45ctw Red Pyrope Garnet, Square, VVS-VS

4.45ctw Red Pyrope Garnet, Square, VVS-VS

4 x 4 mm (calibrated)

$ 34.13

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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 -> 9 star ratings

Easy to use. Many options to find the right gemstone

Posted By Liz in May, 2026
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 -> 10 star ratings

My whole experience is great.

Posted By Ghs in November, 2025
Source: Bizrate

Overall Rating -> 8 star ratings

The website was easy to use and there were a lot of good options, I was satisfied.

Posted By Brielly in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

All items were delivered on time with all items meeting or exceeding my expectations. Cut, clarity and color were very close to the photos and description.

Posted By Bob D in December, 2025
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
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