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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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1.65ctw Red Pyrope Garnet, Square, VVS-VS

1.65ctw Red Pyrope Garnet, Square, VVS-VS

5 x 5 mm (calibrated)

$ 12.66

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5.73ct Yellow Citrine, Oval, VVS

5.73ct Yellow Citrine, Oval, VVS

14 x 10 mm (calibrated)

$ 34.40

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2.80ct Orange Hessonite Garnet, Oval, VS

2.80ct Orange Hessonite Garnet, Oval, VS

9.5 x 7.2 mm

$ 55.22

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7.32ct Multicolor Agate, Oval, Opaque

7.32ct Multicolor Agate, Oval, Opaque

12.8 x 11.5 mm

$ 12.39

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1.06ct Blue Cavansite, Fancy, Opaque

1.06ct Blue Cavansite, Fancy, Opaque

8.7 x 7.4 mm

$ 6.16

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0.77ct Yellow Citrine, Trillion, VS-SI

0.77ct Yellow Citrine, Trillion, VS-SI

6.4 x 6.2 mm

$ 6.39

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0.75ct Yellow Color-Change Diaspore, Pear Shape, VVS-VS

0.75ct Yellow Color-Change Diaspore, Pear Shape, VVS-VS

12.2 x 3.8 mm

$ 23.90

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2.72ct Green Prehnite, Oval, Transparent/Translucent

2.72ct Green Prehnite, Oval, Transparent/Translucent

8.8 x 7.7 mm

$ 14.62

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1.51ct Pink Morganite, Pear Shape, VS

1.51ct Pink Morganite, Pear Shape, VS

9.6 x 6.3 mm

$ 115.80

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0.49ct Yellow Spessartite Garnet, Oval, VS-SI

0.49ct Yellow Spessartite Garnet, Oval, VS-SI

4.8 x 4 mm

$ 17.08

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6.77ct Multicolor Agate, Oval, Opaque

6.77ct Multicolor Agate, Oval, Opaque

12.8 x 10.4 mm

$ 11.46

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9.59ct Multicolor Fire Agate, Fancy, Translucent

9.59ct Multicolor Fire Agate, Fancy, Translucent

19.3 x 9.5 mm

$ 75.23

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7.17ct Blue Chalcedony, Cushion, Translucent

7.17ct Blue Chalcedony, Cushion, Translucent

12 x 12 mm (calibrated)

$ 26.78

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3.56ct Blue Chalcedony, Oval, Transparent

3.56ct Blue Chalcedony, Oval, Transparent

11 x 9 mm (calibrated)

$ 7.09

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3.05ct Yellow Rutile Quartz, Pear Shape, Transparent

3.05ct Yellow Rutile Quartz, Pear Shape, Transparent

10 x 7 mm (calibrated)

$ 8.22

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14.38ctw Green Prehnite, Fancy, Transparent

14.38ctw Green Prehnite, Fancy, Transparent

17.1 x 11.8 mm

$ 22.53

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21.18ctw Multicolor Labradorite, Oval, Translucent

21.18ctw Multicolor Labradorite, Oval, Translucent

20 x 15 mm (calibrated)

$ 46.41

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0.71ct Yellow Color-Change Diaspore, Cushion, VS

0.71ct Yellow Color-Change Diaspore, Cushion, VS

5.5 x 5.3 mm

$ 37.48

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1.29ct Multicolor Opal, Marquise, Translucent

1.29ct Multicolor Opal, Marquise, Translucent

12.1 x 6 mm

$ 49.47

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8.88ct Brown Smoky Quartz, Round, VS

8.88ct Brown Smoky Quartz, Round, VS

15 mm (calibrated)

$ 14.59

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1.00ct Purple Spinel, Cushion, VS

1.00ct Purple Spinel, Cushion, VS

6.1 x 5.2 mm

$ 29.80

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6.65ctw Violet Amethyst, Oval, Transparent

6.65ctw Violet Amethyst, Oval, Transparent

10 x 8 mm (calibrated)

$ 36.44

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1.39ct Yellow Chrysoberyl Cat'S Eye, Oval, Opaque

1.39ct Yellow Chrysoberyl Cat'S Eye, Oval, Opaque

6.2 x 4.6 mm

$ 41.53

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0.91ct Violet Amethyst, Marquise, VVS-VS

0.91ct Violet Amethyst, Marquise, VVS-VS

9.9 x 5.1 mm

$ 6.04

View Gem
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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

love the site, the experience and the products.

Posted By Ckingpots in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Good selection prices are reasonable!

Posted By ToRa62 in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

On the clarity options it goes "and better" so if youre looking for si specifically and you click si and better it still shows you basically everything. It just removes the opaques. Itd be nice if it was vs only, vss only, si only, etc

Posted By Iamnotakrustykrab in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Found a beautiful opal at a great price. I was not disappointed when it arrived. Even better in person.

Posted By Fried Rice in August, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly

Posted By Ron T in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

This is the first time I have used this site. I was dissatisfied with the quality of gems and supplies elsewhere and decided to try GemSelect. They are awesome! I was thrilled to see the variety and the great web performance. There was the ability to search for information as well as gems. Things like the clarity rating system and caret weight of the gems. I have always loved making things and I have just started to make jewelry as a business. However I have never made a ring before and have always wanted to. On GemSelect I was able to find good quality gems to use in my creations. I am so glad the website is so easy to use. Thank you GemSelect.

Posted By PickyShopper in April, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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