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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
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1.63ct Violet Amethyst, Trillion, VS

1.63ct Violet Amethyst, Trillion, VS

8 x 8 mm (calibrated)

$ 10.77

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3.65ctw Brown Smoky Quartz, Round, VVS-VS

3.65ctw Brown Smoky Quartz, Round, VVS-VS

8 mm (calibrated)

$ 20.00

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10.98ct Multicolor Agate, Oval, Opaque

10.98ct Multicolor Agate, Oval, Opaque

15.1 x 12.4 mm

$ 10.94

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1.05ct Yellow Color-Change Diaspore, Cushion, VVS-VS

1.05ct Yellow Color-Change Diaspore, Cushion, VVS-VS

8.1 x 5.2 mm

$ 54.07

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2.85ct Red Almandine Garnet, Oval, VVS-VS

2.85ct Red Almandine Garnet, Oval, VVS-VS

10 x 8 mm (calibrated)

$ 70.97

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14.20ctw Violet Amethyst, Oval, Transparent

14.20ctw Violet Amethyst, Oval, Transparent

14 x 10 mm (calibrated)

$ 77.79

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1.13ct Yellow Color-Change Diaspore, Pear Shape, VS-SI

1.13ct Yellow Color-Change Diaspore, Pear Shape, VS-SI

8 x 5 mm (calibrated)

$ 60.01

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6.84ct Green Amazonite, Marquise, Opaque

6.84ct Green Amazonite, Marquise, Opaque

19.2 x 9.9 mm

$ 14.92

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13.83ct Red Star Garnet, Oval, Opaque

13.83ct Red Star Garnet, Oval, Opaque

14 x 12 mm (calibrated)

$ 13.64

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1.45ct Pink Morganite, Round, VS

1.45ct Pink Morganite, Round, VS

7.5 mm (calibrated)

$ 56.32

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0.97ct Yellow Color-Change Diaspore, Emerald Cut, VS

0.97ct Yellow Color-Change Diaspore, Emerald Cut, VS

6.9 x 4.2 mm

$ 51.69

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1.82ct Multicolor Opal, Oval, Translucent

1.82ct Multicolor Opal, Oval, Translucent

11.2 x 8 mm

$ 45.77

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1.43ctw Yellow Color-Change Diaspore, Cushion, VVS-VS

1.43ctw Yellow Color-Change Diaspore, Cushion, VVS-VS

5.9 x 5.3 mm

$ 75.49

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2.73ctw Orange Hessonite Garnet, Square, VS-SI

2.73ctw Orange Hessonite Garnet, Square, VS-SI

6 x 6 mm (calibrated)

$ 59.82

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5.72ctw Multicolor Opal, Round, Translucent

5.72ctw Multicolor Opal, Round, Translucent

8 mm (calibrated)

$ 175.48

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22.73ct Multicolor Rainbow Pyrite, Pear Shape, Opaque

22.73ct Multicolor Rainbow Pyrite, Pear Shape, Opaque

25 x 18 mm (calibrated)

$ 67.92

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2.61ctw Violet Amethyst, Oval, VVS-VS

2.61ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 14.30

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0.92ct Purple Spinel, Cushion, VVS-VS

0.92ct Purple Spinel, Cushion, VVS-VS

5.6 x 5.2 mm

$ 64.14

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1.77ct Violet Amethyst, Marquise, VS

1.77ct Violet Amethyst, Marquise, VS

12 x 6.1 mm

$ 11.64

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0.47ct Yellow Spessartite Garnet, Pear Shape, VS

0.47ct Yellow Spessartite Garnet, Pear Shape, VS

5 x 4 mm (calibrated)

$ 16.38

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4.62ct Multicolor Fire Agate, Fancy, Opaque

4.62ct Multicolor Fire Agate, Fancy, Opaque

13 x 9 mm (calibrated)

$ 65.09

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2.20ctw Multicolor Andalusite, Round, VS

2.20ctw Multicolor Andalusite, Round, VS

4 mm (calibrated)

$ 108.46

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1.05ctw Red Pyrope Garnet, Square, VVS-VS

1.05ctw Red Pyrope Garnet, Square, VVS-VS

4 x 4 mm (calibrated)

$ 8.06

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2.37ctw Red Pyrope Garnet, Marquise, VVS-VS

2.37ctw Red Pyrope Garnet, Marquise, VVS-VS

10.1 x 5.1 mm

$ 20.77

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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

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

Overall Rating -> 8 star ratings

It was a good interaction I got a good gemstone for cheap

Posted By Jon in December, 2025
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Overall Rating -> 10 star ratings

Easy to use website

Posted By Mel in February, 2026
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Overall Rating -> 10 star ratings

I had a very easy time navigating the web page and using filters to find what I was looking for. The varied selection was nice to see and pricing is clear and fair.

Posted By Mattick in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Good, hope gem quality is good and genuine

Posted By Varun in May, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

I loved the selection of gemstones you have a to z

Posted By James in May, 2026
Source: Bizrate
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