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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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1.60ct Violet Amethyst, Trillion, VS

1.60ct Violet Amethyst, Trillion, VS

8.5 x 8.2 mm

$ 10.57

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0.58ct Pink Morganite, Pear Shape, VVS

0.58ct Pink Morganite, Pear Shape, VVS

7.8 x 4.8 mm

$ 34.95

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3.51ct Pink Morganite, Marquise, Translucent

3.51ct Pink Morganite, Marquise, Translucent

14.9 x 7 mm

$ 38.45

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1.46ct Gray Sillimanite Cat'S Eye, Oval, Transparent

1.46ct Gray Sillimanite Cat'S Eye, Oval, Transparent

7.4 x 5.6 mm

$ 4.80

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1.77ctw Red Pyrope Garnet, Heart, VVS-VS

1.77ctw Red Pyrope Garnet, Heart, VVS-VS

6 x 6 mm (calibrated)

$ 13.58

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1.16ctw Red Pyrope Garnet, Heart, VS

1.16ctw Red Pyrope Garnet, Heart, VS

5 x 5 mm (calibrated)

$ 28.88

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0.60ct Purple Spinel, Round, VVS-VS

0.60ct Purple Spinel, Round, VVS-VS

5 mm (calibrated)

$ 30.36

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12.43ct Multicolor Labradorite, Pear Shape, Translucent

12.43ct Multicolor Labradorite, Pear Shape, Translucent

18 x 13 mm (calibrated)

$ 27.48

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3.98ctw Red Pyrope Garnet, Square, VS

3.98ctw Red Pyrope Garnet, Square, VS

4 x 4 mm (calibrated)

$ 30.53

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17.11ct Green Bloodstone, Oval, Opaque

17.11ct Green Bloodstone, Oval, Opaque

16.6 x 13.1 mm

$ 34.08

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5.81ct Yellow Citrine, Briolette, VVS

5.81ct Yellow Citrine, Briolette, VVS

15.4 x 8 mm

$ 32.53

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1.56ct Green Tourmaline, Emerald Cut, VVS-VS

1.56ct Green Tourmaline, Emerald Cut, VVS-VS

10.5 x 4.8 mm

$ 77.69

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6.70ctw White Topaz, Oval, VVS-VS
Topaz Product Video (462375)

6.70ctw White Topaz, Oval, VVS-VS

10 x 8 mm (calibrated)

$ 36.70

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2.74ctw Brown Color-Change Garnet, Oval, VS

2.74ctw Brown Color-Change Garnet, Oval, VS

6.8 x 5.5 mm

$ 218.90

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5.58ctw Green Prehnite, Oval, Transparent
Prehnite Product Video (375993)

5.58ctw Green Prehnite, Oval, Transparent

7.3 x 6.5 mm

$ 29.90

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4.88ct Multicolor Agate, Round, Opaque

4.88ct Multicolor Agate, Round, Opaque

10.4 mm

$ 4.86

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14.64ct Black Spinel, Baguette, Opaque

14.64ct Black Spinel, Baguette, Opaque

20.2 x 10.1 mm

$ 48.12

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48.31ct Blue Turquoise, Oval, Opaque

48.31ct Blue Turquoise, Oval, Opaque

28.8 x 21.2 mm

$ 144.35

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0.34ct Orange Spessartite Garnet, Round, SI

0.34ct Orange Spessartite Garnet, Round, SI

4.2 mm

$ 11.51

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13.95ct Violet Amethyst, Round, VVS-VS

13.95ct Violet Amethyst, Round, VVS-VS

15 mm (calibrated)

$ 97.26

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0.86ct Orange Hessonite Garnet, Round, VVS-VS

0.86ct Orange Hessonite Garnet, Round, VVS-VS

5.7 mm

$ 13.14

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0.88ct Orange Hessonite Garnet, Cushion, SI

0.88ct Orange Hessonite Garnet, Cushion, SI

5.3 x 5.3 mm

$ 17.35

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5.07ctw Orange Hessonite Garnet, Emerald Cut, VS
Hessonite Garnet Product Video (391938)

5.07ctw Orange Hessonite Garnet, Emerald Cut, VS

6.7 x 5 mm

$ 111.10

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0.31ct Blue Kyanite, Round, SI

0.31ct Blue Kyanite, Round, SI

4 mm (calibrated)

$ 7.72

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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

Took a chance on purchasing my gemstones from Gemselect and was impressed. 10/10

Posted By KT in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Easy to use. No issues. Large selection of gems.

Posted By CLTCJH in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Great selection of gems at a reasonable price

Posted By Curt in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very neat and to the point

Posted By Botha in March, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

The website was easy to use and informative of the selection of stones it has. I quickly found the right stone for me.

Posted By Guero in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.

Posted By Kelly in May, 2026
Source: Bizrate
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