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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
Untreated Gemstones Clarity
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Untreated Gemstones Treatment

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Yellow Untreated Gemstones
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81.18ct Violet Amethyst, Oval, VVS-VS
Amethyst Product Video (639274)

81.18ct Violet Amethyst, Oval, VVS-VS

27.8 x 25.3 mm

$ 565.99

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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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1.69ctw Multicolor Andalusite, Oval, VS

1.69ctw Multicolor Andalusite, Oval, VS

5 x 3 mm (calibrated)

$ 90.28

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7.26ct Green Malachite, Baguette, Opaque

7.26ct Green Malachite, Baguette, Opaque

11.6 x 7.2 mm

$ 9.15

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1.18ct Yellow Color-Change Diaspore, Emerald Cut, VS

1.18ct Yellow Color-Change Diaspore, Emerald Cut, VS

6.2 x 5.3 mm

$ 55.13

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1.95ctw Brown Sillimanite Cat'S Eye, Oval, Transparent

1.95ctw Brown Sillimanite Cat'S Eye, Oval, Transparent

7.1 x 5.3 mm

$ 6.42

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10.24ct Blue Larimar, Oval, Translucent
Larimar Product Video (541686)

10.24ct Blue Larimar, Oval, Translucent

18 x 13 mm (calibrated)

$ 121.43

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13.90ctw Brown Smoky Quartz, Oval, VVS

13.90ctw Brown Smoky Quartz, Oval, VVS

14 x 12 mm (calibrated)

$ 53.03

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6.98ct White Rainbow Moonstone, Baguette, Transparent

6.98ct White Rainbow Moonstone, Baguette, Transparent

18.9 x 6.7 mm

$ 104.28

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0.87ct Pink Malaya Garnet, Marquise, VS

0.87ct Pink Malaya Garnet, Marquise, VS

8.7 x 4.6 mm

$ 40.03

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0.87ct Multicolor Opal, Round, Transparent
Opal Product Video (540981)

0.87ct Multicolor Opal, Round, Transparent

7 mm (calibrated)

$ 18.02

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127.45ct Purple Star Ruby, Oval, Opaque
Star Ruby Product Video (513650)

127.45ct Purple Star Ruby, Oval, Opaque

28.6 x 26.2 mm

$ 1,745.43

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8.20ct Pink Rose Quartz, Emerald Cut, Transparent

8.20ct Pink Rose Quartz, Emerald Cut, Transparent

12 x 12 mm (calibrated)

$ 44.92

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37.39ct Multicolor Rainbow Pyrite, Heart, Opaque

37.39ct Multicolor Rainbow Pyrite, Heart, Opaque

32.2 x 24.9 mm

$ 96.82

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39.55ct Multicolor Labradorite, Pear Shape, Opaque

39.55ct Multicolor Labradorite, Pear Shape, Opaque

30 x 22 mm (calibrated)

$ 39.39

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63.97ct Multicolor Rhodochrosite, Oval, Opaque
Rhodochrosite Product Video (471274)

63.97ct Multicolor Rhodochrosite, Oval, Opaque

39.9 x 25.6 mm

$ 109.33

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1.74ctw Yellow Morganite, Pear Shape, VS
Morganite Product Video (571873)

1.74ctw Yellow Morganite, Pear Shape, VS

8 x 6 mm (calibrated)

$ 114.38

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21.16ct Multicolor Boulder Opal, Fancy, Opaque
Boulder Opal Product Video (678766)

21.16ct Multicolor Boulder Opal, Fancy, Opaque

25.6 x 16.9 mm

$ 105.38

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6.48ct Green Actinolite Cat'S Eye, Oval, Translucent

6.48ct Green Actinolite Cat'S Eye, Oval, Translucent

14.8 x 11.7 mm

$ 45.18

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0.57ct Green Demantoid Garnet, Oval, VVS-VS

0.57ct Green Demantoid Garnet, Oval, VVS-VS

6.2 x 4.2 mm

$ 156.12

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7.75ct Yellow Apatite, Pear Shape, VS
Apatite Product Video (385930)

7.75ct Yellow Apatite, Pear Shape, VS

14.9 x 12.5 mm

$ 409.26

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63.54ct Pink Rose Quartz, Oval, Transparent
Rose Quartz Product Video (344388)

63.54ct Pink Rose Quartz, Oval, Transparent

27.5 x 22.7 mm

$ 93.97

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1.15ct Yellow Chrysoberyl, Pear Shape, VVS

1.15ct Yellow Chrysoberyl, Pear Shape, VVS

8.6 x 5.7 mm

$ 134.02

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37.98ct Multicolor Opal, Pear Shape, Opaque
Opal Product Video (667934)

37.98ct Multicolor Opal, Pear Shape, Opaque

30 x 22 mm (calibrated)

$ 94.57

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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

Nothing bad to report. Everything is as expected. The gems and the price are all very good.

Posted By Dafanatic in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I have a beautiful emerald I purchased from a company names gemselect and they are awesome! You should try them out?

Posted By Lynn in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

They have a wonderful selection of gems of all sorts, shapes, cuts, and quality. I am very particular about the quality of stones I buy, and found many with VVS clarity and excellent cut and polish. I am thrilled with each of the stones I purchased, and would definitely recommend GemSelect to everyone.

Posted By Debsarabs in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

So far So good

Posted By VH-1 in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I could see the actual gem I was buying

Posted By Bugs in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

this site is awesome. I was able to look at the products think about purchasing and come back and find the same products. With the amount of inventory gem select has. Its awesome to be able to filter the way that they allow you too.

Posted By Tommyp in November, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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