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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
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Untreated Gemstones Treatment

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Black Untreated Gemstones
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Multicolor Untreated Gemstones
Orange Untreated Gemstones
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Yellow Untreated Gemstones
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24.23ctw Brown Tiger'S Eye, Baguette, Opaque

24.23ctw Brown Tiger'S Eye, Baguette, Opaque

18 x 13 mm (calibrated)

$ 26.54

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21.19ct Green Druzy Variscite, Fancy, Opaque

21.19ct Green Druzy Variscite, Fancy, Opaque

33.4 x 16.6 mm

$ 89.91

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30.58ct Turquoise Hiddenite, Oval, VVS-VS
Hiddenite Product Video (706629)

30.58ct Turquoise Hiddenite, Oval, VVS-VS

20 x 15 mm (calibrated)

$ 759.00

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9.73ct Multicolor Rainbow Pyrite, Marquise, Opaque

9.73ct Multicolor Rainbow Pyrite, Marquise, Opaque

29.8 x 9.3 mm

$ 25.20

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0.57ct Yellow Demantoid Garnet, Oval, VS
Demantoid Garnet Product Video (278684)

0.57ct Yellow Demantoid Garnet, Oval, VS

5.7 x 3.9 mm

$ 130.10

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12.03ct Turquoise Larimar, Pear Shape, Opaque
Larimar Product Video (391510)

12.03ct Turquoise Larimar, Pear Shape, Opaque

20 x 15 mm (calibrated)

$ 158.16

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19.94ct Multicolor Boulder Opal, Marquise, Opaque

19.94ct Multicolor Boulder Opal, Marquise, Opaque

36.4 x 16.3 mm

$ 109.23

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7.33ct Turquoise Grandidierite, Emerald Cut, SI-I1
Grandidierite Product Video (547738)

7.33ct Turquoise Grandidierite, Emerald Cut, SI-I1

16 x 9 mm

$ 240.92

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63.42ct Multicolor Rhodonite, Fancy, Opaque
Rhodonite Product Video (690743)

63.42ct Multicolor Rhodonite, Fancy, Opaque

25.7 x 22.9 mm

$ 58.12

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39.74ct Brown Moonstone, Oval, Opaque

39.74ct Brown Moonstone, Oval, Opaque

25 x 18 mm (calibrated)

$ 65.30

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75.10ct Multicolor Quartz With Marcasite, Round, Transparent
Quartz With Marcasite Product Video (617897)

75.10ct Multicolor Quartz With Marcasite, Round, Transparent

22.5 mm

$ 411.40

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31.34ct Brown Moonstone, Oval, Opaque

31.34ct Brown Moonstone, Oval, Opaque

20.2 x 16.2 mm

$ 57.23

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99.30ctw White Quartz, Pear Shape, Transparent
Quartz Product Video (501696)

99.30ctw White Quartz, Pear Shape, Transparent

64.7 x 20.1 mm

$ 326.38

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11.13ct Yellow Rutile Quartz, Oval, Transparent

11.13ct Yellow Rutile Quartz, Oval, Transparent

21.8 x 12 mm

$ 39.14

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13.59ct Brown Smoky Quartz, Emerald Cut, VVS
Smoky Quartz Product Video (599537)

13.59ct Brown Smoky Quartz, Emerald Cut, VVS

16 x 16 mm (calibrated)

$ 37.23

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35.80ct Multicolor Jasper, Fancy, Opaque

35.80ct Multicolor Jasper, Fancy, Opaque

34.1 x 26.3 mm

$ 39.23

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13.25ct Brown Smoky Quartz, Emerald Cut, VVS

13.25ct Brown Smoky Quartz, Emerald Cut, VVS

16 x 16 mm (calibrated)

$ 36.30

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0.67ct Green Peridot, Square, VVS-VS
Peridot Product Video (527303)

0.67ct Green Peridot, Square, VVS-VS

5 x 5 mm (calibrated)

$ 9.20

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38.28ct Black Tourmaline, Emerald Cut, Opaque

38.28ct Black Tourmaline, Emerald Cut, Opaque

27.8 x 14.3 mm

$ 158.86

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2.78ctw White Sillimanite Cat'S Eye, Oval, Transparent

2.78ctw White Sillimanite Cat'S Eye, Oval, Transparent

7.5 x 5.1 mm

$ 9.13

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33.60ct Multicolor Labradorite, Round, Translucent
Labradorite Product Video (711718)

33.60ct Multicolor Labradorite, Round, Translucent

25 mm

$ 74.29

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24.20ct Violet Amethyst, Flower Cut, Translucent

24.20ct Violet Amethyst, Flower Cut, Translucent

18.5 x 18.1 mm

$ 66.28

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5.81ct Brown Cat'S Eye Scapolite, Oval, Translucent

5.81ct Brown Cat'S Eye Scapolite, Oval, Translucent

11.5 x 9.3 mm

$ 31.83

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8.58ct Brown Smoky Quartz, Emerald Cut, VVS-VS

8.58ct Brown Smoky Quartz, Emerald Cut, VVS-VS

14 x 14 mm (calibrated)

$ 34.59

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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

My experience has always been fantastic. Today I saved 6 gems to email a customer looking for a particular color blend to fit into an east west setting, so her options were limited, but we found one she wanted, deleted all the others in the cart and order the gem she selected. It was helpful to be able to put them in the cart so I could save them until she selected the one she wanted without having to research all of them again.

Posted By RJ in January, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

It was fine

Posted By Na in April, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Fast snd easy to find what I was looking for

Posted By Bawb in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Easy to use. No issues. Large selection of gems.

Posted By CLTCJH in February, 2026
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

All good

Posted By DouscheGift in August, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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