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Untreated Gemstones

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

Untreated Gemstones Weight
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1.03ct Purple Rhodolite Garnet, Pear Shape, VS-SI

1.03ct Purple Rhodolite Garnet, Pear Shape, VS-SI

7 x 5 mm (calibrated)

$ 27.36

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39.68ct Multicolor Rhodochrosite, Oval, Translucent

39.68ct Multicolor Rhodochrosite, Oval, Translucent

35.9 x 17 mm

$ 67.82

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15.04ct Multicolor Psilomelane Dendrite, Oval, Opaque

15.04ct Multicolor Psilomelane Dendrite, Oval, Opaque

25.3 x 16.8 mm

$ 12.13

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2.76ctw Red Pyrope Garnet, Square, VVS-VS

2.76ctw Red Pyrope Garnet, Square, VVS-VS

4 x 4 mm (calibrated)

$ 21.17

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1.13ct Multicolor Pietersite, Pear Shape, Opaque

1.13ct Multicolor Pietersite, Pear Shape, Opaque

8.1 x 5.5 mm

$ 2.67

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2.71ct Blue Chalcedony, Oval, Transparent

2.71ct Blue Chalcedony, Oval, Transparent

10 x 8 mm (calibrated)

$ 5.40

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1.48ct Pink Tourmaline, Oval, VS

1.48ct Pink Tourmaline, Oval, VS

7.6 x 6.2 mm

$ 206.37

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1.14ctw Multicolor Opal, Pear Shape, Transparent

1.14ctw Multicolor Opal, Pear Shape, Transparent

8 x 5.2 mm

$ 28.39

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10.92ct Green Uvarovite Garnet Drusy, Fancy, Opaque

10.92ct Green Uvarovite Garnet Drusy, Fancy, Opaque

18 x 13 mm (calibrated)

$ 16.32

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6.40ctw Multicolor Labradorite, Baguette, Translucent

6.40ctw Multicolor Labradorite, Baguette, Translucent

9 x 7 mm (calibrated)

$ 8.80

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7.41ct Green Amazonite, Fancy, Opaque

7.41ct Green Amazonite, Fancy, Opaque

18.4 x 9.7 mm

$ 7.53

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21.73ctw Green Prehnite, Fancy, Transparent

21.73ctw Green Prehnite, Fancy, Transparent

16.8 x 11.9 mm

$ 30.24

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0.82ct Green Tourmaline, Emerald Cut, VVS

0.82ct Green Tourmaline, Emerald Cut, VVS

10.6 x 3.3 mm

$ 20.42

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1.79ct Multicolor Spectrolite, Oval, Opaque

1.79ct Multicolor Spectrolite, Oval, Opaque

10 x 8 mm (calibrated)

$ 8.18

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0.49ct Green Cat'S Eye Alexandrite, Oval, Opaque

0.49ct Green Cat'S Eye Alexandrite, Oval, Opaque

4.9 x 3.4 mm

$ 81.34

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0.93ct Pink Morganite, Oval, VS

0.93ct Pink Morganite, Oval, VS

7.2 x 5.7 mm

$ 81.51

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12.41ct Violet Amethyst, Cushion, VVS

12.41ct Violet Amethyst, Cushion, VVS

15 x 15 mm (calibrated)

$ 86.52

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1.58ctw Gray Sillimanite Cat'S Eye, Oval, Translucent

1.58ctw Gray Sillimanite Cat'S Eye, Oval, Translucent

6.4 x 4.2 mm

$ 4.99

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6.95ct Green Druzy Variscite, Fancy, Opaque

6.95ct Green Druzy Variscite, Fancy, Opaque

21.2 x 14.8 mm

$ 7.13

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5.18ctw Red Pyrope Garnet, Heart, VVS-VS

5.18ctw Red Pyrope Garnet, Heart, VVS-VS

6 x 6 mm (calibrated)

$ 33.11

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26.60ctw Multicolor Jasper, Oval, Opaque

26.60ctw Multicolor Jasper, Oval, Opaque

20 x 15 mm (calibrated)

$ 35.27

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3.62ct Violet Amethyst, Oval, Transparent

3.62ct Violet Amethyst, Oval, Transparent

10 x 8 mm (calibrated)

$ 19.83

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0.85ct Yellow Morganite, Pear Shape, VS

0.85ct Yellow Morganite, Pear Shape, VS

8 x 6 mm (calibrated)

$ 37.25

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8.52ct Yellow Apatite, Oval, VS-SI
Apatite Product Video (407291)

8.52ct Yellow Apatite, Oval, VS-SI

16 x 12 mm (calibrated)

$ 254.58

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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 -> 10 star ratings

I love the ability to choose from many options of shapes, gemstone type, color, and so forth. It is fun!

Posted By Geof in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I was looking for high-quality amethyst on this site, and I was able to compare size, color, and weight in detail before making a purchase.

Posted By Atsuhisa in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Was a good experience.

Posted By Tim in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.

Posted By Kelly in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Very good

Posted By Niska in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Great site for finding specific stones and sizes for individual pieces of jewelry

Posted By Designer in December, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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