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Untreated Gemstones

Browse our selection of untreated gemstones featuring natural color, clarity and beauty without enhancements.

Untreated Gemstones Weight
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0.85ct Yellow Color-Change Diaspore, Pear Shape, VVS-VS

0.85ct Yellow Color-Change Diaspore, Pear Shape, VVS-VS

9.8 x 4.9 mm

$ 29.80

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0.74ct Orange Hessonite Garnet, Pear Shape, VS-SI

0.74ct Orange Hessonite Garnet, Pear Shape, VS-SI

6.8 x 4.7 mm

$ 16.22

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0.95ct Green Peridot, Oval, VS

0.95ct Green Peridot, Oval, VS

7 x 5 mm (calibrated)

$ 6.62

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0.99ct Red Rhodolite Garnet, Oval, VS-SI

0.99ct Red Rhodolite Garnet, Oval, VS-SI

7 x 5 mm (calibrated)

$ 26.29

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3.97ct Yellow Rutile Quartz, Marquise, Transparent

3.97ct Yellow Rutile Quartz, Marquise, Transparent

14.1 x 7.1 mm

$ 10.71

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2.06ct Brown Rutile Quartz, Oval, Transparent

2.06ct Brown Rutile Quartz, Oval, Transparent

9 x 7 mm (calibrated)

$ 5.01

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1.81ct Orange Moonstone, Trillion, Translucent

1.81ct Orange Moonstone, Trillion, Translucent

8 x 8 mm (calibrated)

$ 3.60

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1.06ctw Green Peridot, Marquise, VS

1.06ctw Green Peridot, Marquise, VS

8.1 x 4 mm

$ 9.30

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4.23ct Brown Rutile Quartz, Round, Transparent

4.23ct Brown Rutile Quartz, Round, Transparent

12 mm (calibrated)

$ 10.62

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1.27ct Yellow Color-Change Diaspore, Baguette, VVS

1.27ct Yellow Color-Change Diaspore, Baguette, VVS

8.3 x 4.4 mm

$ 66.17

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36.54ct Multicolor Moss Agate, Oval, Translucent
Moss Agate Product Video (742953)

36.54ct Multicolor Moss Agate, Oval, Translucent

35.4 x 24.3 mm

$ 30.33

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5.51ct Multicolor Fire Agate, Fancy, Opaque

5.51ct Multicolor Fire Agate, Fancy, Opaque

13 x 9.8 mm

$ 42.37

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13.93ct White Rainbow Moonstone, Pear Shape, Translucent

13.93ct White Rainbow Moonstone, Pear Shape, Translucent

21.7 x 13.2 mm

$ 97.12

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1.48ct Orange Hessonite Garnet, Emerald Cut, VS-SI

1.48ct Orange Hessonite Garnet, Emerald Cut, VS-SI

6 x 6 mm (calibrated)

$ 29.18

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9.70ctw Yellow Citrine, Oval, VVS-VS

9.70ctw Yellow Citrine, Oval, VVS-VS

12 x 10 mm (calibrated)

$ 74.39

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3.78ct Red Strawberry Quartz, Oval, Translucent

3.78ct Red Strawberry Quartz, Oval, Translucent

12 x 10 mm (calibrated)

$ 19.95

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1.29ct Multicolor Opal, Oval, Translucent

1.29ct Multicolor Opal, Oval, Translucent

10 x 8 mm (calibrated)

$ 51.39

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25.97ct Multicolor Jasper, Pear Shape, Opaque

25.97ct Multicolor Jasper, Pear Shape, Opaque

25 x 18 mm (calibrated)

$ 22.20

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0.74ct Green Chrome Diopside, Marquise, VS

0.74ct Green Chrome Diopside, Marquise, VS

9.2 x 4.8 mm

$ 18.43

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0.73ct Yellow Color-Change Diaspore, Emerald Cut, VS-SI

0.73ct Yellow Color-Change Diaspore, Emerald Cut, VS-SI

6.6 x 4.5 mm

$ 27.12

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17.81ct Purple Ruby-Zoisite, Flower Cut, Opaque
Ruby-Zoisite Product Video (658710)

17.81ct Purple Ruby-Zoisite, Flower Cut, Opaque

17.1 x 16.6 mm

$ 21.65

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1.54ct Blue Kyanite, Oval, VS-SI

1.54ct Blue Kyanite, Oval, VS-SI

8 x 6 mm (calibrated)

$ 32.06

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0.95ct Pink Morganite, Oval, VVS-VS

0.95ct Pink Morganite, Oval, VVS-VS

8 x 6 mm (calibrated)

$ 39.43

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5.04ct Orange Sunstone, Oval, Translucent

5.04ct Orange Sunstone, Oval, Translucent

12 x 10 mm (calibrated)

$ 29.99

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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

I was able to find what I've been looking for.

Posted By Tree Dog in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Filters need to be improved but rest of website is great

Posted By Rock hound in December, 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

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

Overall Rating -> 10 star ratings

It was easy to navigate

Posted By GemGod in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.

Posted By Maggie in August, 2025
Source: Bizrate
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