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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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Bi-color Untreated Gemstones
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Yellow Untreated Gemstones
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1.58ct White Sillimanite Cat'S Eye, Oval, Transparent

1.58ct White Sillimanite Cat'S Eye, Oval, Transparent

5.9 x 5.6 mm

$ 6.29

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27.23ct Multicolor Amethyst Geode Slice, Fancy, Transparent

27.23ct Multicolor Amethyst Geode Slice, Fancy, Transparent

27 x 20 mm (calibrated)

$ 29.03

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0.64ct Multicolor Chocolate Opal, Round, Translucent

0.64ct Multicolor Chocolate Opal, Round, Translucent

6 mm (calibrated)

$ 17.53

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19.31ct Multicolor Rainbow Pyrite, Fancy, Opaque

19.31ct Multicolor Rainbow Pyrite, Fancy, Opaque

17.9 x 13.7 mm

$ 50.01

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6.48ct Green Idocrase, Pear Shape, VS
Idocrase Product Video (502119)

6.48ct Green Idocrase, Pear Shape, VS

12.9 x 9.9 mm

$ 606.12

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8.77ct Brown Smoky Quartz, Emerald Cut, VVS-VS

8.77ct Brown Smoky Quartz, Emerald Cut, VVS-VS

12 x 12 mm (calibrated)

$ 48.05

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7.84ct Brown Smoky Quartz, Emerald Cut, VVS

7.84ct Brown Smoky Quartz, Emerald Cut, VVS

14 x 14 mm (calibrated)

$ 32.90

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41.53ct Brown Moonstone, Oval, Opaque
Moonstone Product Video (401031)

41.53ct Brown Moonstone, Oval, Opaque

21.4 x 17.8 mm

$ 68.26

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14.47ct Green Druzy Variscite, Trillion, Opaque

14.47ct Green Druzy Variscite, Trillion, Opaque

35.4 x 17 mm

$ 61.40

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108.15ct Pink Rose Quartz, Oval, Transparent
Rose Quartz Product Video (522443)

108.15ct Pink Rose Quartz, Oval, Transparent

37.9 x 26.2 mm

$ 236.98

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48.61ct White Scolecite, Oval, Opaque
Scolecite Product Video (481303)

48.61ct White Scolecite, Oval, Opaque

40 x 22.9 mm

$ 57.52

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0.89ct Yellow Morganite, Cushion, VS

0.89ct Yellow Morganite, Cushion, VS

6 x 6 mm (calibrated)

$ 48.75

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45.71ct Multicolor Labradorite, Oval, Opaque

45.71ct Multicolor Labradorite, Oval, Opaque

31.9 x 23 mm

$ 40.98

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6.58ct Brown Smoky Quartz, Oval, VVS

6.58ct Brown Smoky Quartz, Oval, VVS

14 x 12 mm (calibrated)

$ 26.96

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4.97ct Green Sphene, Pear Shape, VS-SI
Sphene Product Video (380599)

4.97ct Green Sphene, Pear Shape, VS-SI

11.3 x 9.7 mm

$ 534.76

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38.51ct Green Fluorite, Round, Transparent
Fluorite Product Video (597474)

38.51ct Green Fluorite, Round, Transparent

20 mm (calibrated)

$ 70.32

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9.59ct Yellow Citrine, Round, VVS-VS
Citrine Product Video (512416)

9.59ct Yellow Citrine, Round, VVS-VS

14 mm (calibrated)

$ 52.55

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20.24ct Yellow Quartz Cat'S Eye, Oval, Translucent
Quartz Cat's Eye Product Video (675354)

20.24ct Yellow Quartz Cat'S Eye, Oval, Translucent

15 x 15 mm (calibrated)

$ 412.65

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2.89ct Yellow Apatite, Oval, VS

2.89ct Yellow Apatite, Oval, VS

9.6 x 8.3 mm

$ 79.17

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0.14ct Black Diamond, Square, Opaque

0.14ct Black Diamond, Square, Opaque

2.6 x 2.4 mm

$ 69.72

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19.30ct Pink Morganite, Round, VVS-VS
Morganite Product Video (594878)

19.30ct Pink Morganite, Round, VVS-VS

17 mm (calibrated)

$ 3,171.76

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13.98ct Turquoise Grandidierite, Oval, SI
Grandidierite Product Video (470658)

13.98ct Turquoise Grandidierite, Oval, SI

16.5 x 13.7 mm

$ 7,658.24

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0.99ct Green Tsavorite Garnet, Oval, VS-SI
Tsavorite Garnet Product Video (415864)

0.99ct Green Tsavorite Garnet, Oval, VS-SI

7 x 5 mm (calibrated)

$ 542.32

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16.82ct Multicolor Pietersite, Round, Opaque

16.82ct Multicolor Pietersite, Round, Opaque

19 mm (calibrated)

$ 63.50

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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

Found a rock that met my need. Bought it!

Posted By Skot in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Gem Select has a user friendly website and the product is very good as is the price. The gems are described accurately and I always get what I think I'm getting.

Posted By Happy Customer in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Great website, easy to navigate, and loads quickly. Have bought here before, very pleased!

Posted By SallyO in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

GemSelect is always my first choice for purchasing gemstones. The fact that the gems are always exactly as described and pictured on the website has earned my trust many times over. Even when I don't buy, I still love browsing all the beautiful stones. My new favorites are the bright green Tsavorites!

Posted By Lkcisneros in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Would have bought an indigo and selenite, but neither listed. But, you do offer quite a large assortment otherwise.

Posted By JD in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Was a good experience.

Posted By Tim in July, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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