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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
Untreated Gemstones Size
Untreated Gemstones Clarity
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Untreated Gemstones Treatment

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For Example: 8-9
Bi-color Untreated Gemstones
Black Untreated Gemstones
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Multicolor Untreated Gemstones
Orange Untreated Gemstones
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Yellow Untreated Gemstones
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3.76ct Violet Amethyst, Pear Shape, VVS

3.76ct Violet Amethyst, Pear Shape, VVS

13.8 x 9.6 mm

$ 27.31

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0.70ct Orange Zircon, Oval, VVS

0.70ct Orange Zircon, Oval, VVS

6 x 4 mm (calibrated)

$ 10.46

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0.43ct Violet Amethyst, Marquise, VVS-VS

0.43ct Violet Amethyst, Marquise, VVS-VS

8 x 4 mm (calibrated)

$ 2.86

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0.78ct Purple Spinel, Emerald Cut, VS

0.78ct Purple Spinel, Emerald Cut, VS

5.7 x 4.1 mm

$ 27.89

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35.96ct Gray Hematite, Pear Shape, Opaque

35.96ct Gray Hematite, Pear Shape, Opaque

24.9 x 16.4 mm

$ 36.25

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1.06ct Purple Spinel, Oval, VS

1.06ct Purple Spinel, Oval, VS

6.6 x 5.4 mm

$ 119.12

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0.88ct Yellow Sphalerite, Round, SI

0.88ct Yellow Sphalerite, Round, SI

5.5 mm (calibrated)

$ 43.82

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0.63ct Yellow Beryl, Oval, VS

0.63ct Yellow Beryl, Oval, VS

7.2 x 5.2 mm

$ 15.69

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1.41ct Yellow Citrine, Emerald Cut, VVS

1.41ct Yellow Citrine, Emerald Cut, VVS

8 x 6 mm (calibrated)

$ 9.83

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1.04ct Yellow Color-Change Diaspore, Oval, VVS-VS

1.04ct Yellow Color-Change Diaspore, Oval, VVS-VS

8.2 x 4.5 mm

$ 49.47

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0.31ct Green Chrysoberyl Cat'S Eye, Oval, Translucent

0.31ct Green Chrysoberyl Cat'S Eye, Oval, Translucent

5.4 x 2.7 mm

$ 9.26

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1.82ctw Multicolor Opal, Oval, Transparent

1.82ctw Multicolor Opal, Oval, Transparent

7 x 5 mm (calibrated)

$ 72.51

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2.16ct Red Almandine Garnet, Oval, VVS-VS

2.16ct Red Almandine Garnet, Oval, VVS-VS

9 x 7 mm (calibrated)

$ 80.68

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1.20ct Yellow Citrine, Round, VVS-VS

1.20ct Yellow Citrine, Round, VVS-VS

7 mm (calibrated)

$ 7.97

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0.47ct Green Chrome Diopside, Oval, VVS-VS

0.47ct Green Chrome Diopside, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 11.70

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1.34ct Pink Malaya Garnet, Round, VS

1.34ct Pink Malaya Garnet, Round, VS

6.5 mm (calibrated)

$ 62.40

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14.99ctw Black Spinel, Round, Opaque

14.99ctw Black Spinel, Round, Opaque

12 mm (calibrated)

$ 49.27

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0.08ctw Black Diamond, Round, Opaque

0.08ctw Black Diamond, Round, Opaque

2 mm (calibrated)

$ 19.37

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28.03ct Multicolor Labradorite, Oval, Opaque

28.03ct Multicolor Labradorite, Oval, Opaque

32.1 x 19.6 mm

$ 25.13

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20.09ct Red Ruby-Zoisite, Flower Cut, Opaque

20.09ct Red Ruby-Zoisite, Flower Cut, Opaque

20 x 15 mm (calibrated)

$ 24.41

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0.03ct White Diamond, Round, VVS

0.03ct White Diamond, Round, VVS

2 mm (calibrated)

$ 68.48

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2.83ctw Red Rhodolite Garnet, Square, VS

2.83ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 24.77

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7.81ct Multicolor Rainbow Pyrite, Trillion, Opaque

7.81ct Multicolor Rainbow Pyrite, Trillion, Opaque

18.6 x 16.2 mm

$ 27.46

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1.07ct White Rainbow Moonstone, Oval, Transparent

1.07ct White Rainbow Moonstone, Oval, Transparent

8 x 6 mm (calibrated)

$ 34.10

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 -> 8 star ratings

I visited several online loose stone shops trying to find rare stones. I finally found one that I've been looking for here, and very satisfied. Looking forward to receive the item in 3 weeks.

Posted By Atsu in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I purchased from you before and I have never been disappointed. I always received what I expected and your products are very nice.

Posted By MVK in July, 2025
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 -> 9 star ratings

Very good and simple exchange

Posted By Waylon in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

GemSelect offers excellent choices, prices & service- highly recommended! Unfortunately, prior to ordering a replacement gemstone, my jeweler neglected to mention it needed to be one that was a'cushion cuta' to fit the existing mount. Have yet to return/exchangea'

Posted By CJ in March, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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