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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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0.96ct Yellow Color-Change Diaspore, Pear Shape, VS

0.96ct Yellow Color-Change Diaspore, Pear Shape, VS

9.6 x 4.4 mm

$ 33.66

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1.43ct Orange Hessonite Garnet, Emerald Cut, VS

1.43ct Orange Hessonite Garnet, Emerald Cut, VS

7 x 5 mm (calibrated)

$ 28.20

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1.27ct Yellow Citrine, Emerald Cut, VVS

1.27ct Yellow Citrine, Emerald Cut, VVS

8 x 6 mm (calibrated)

$ 8.86

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1.87ct Violet Amethyst, Pear Shape, VVS-VS

1.87ct Violet Amethyst, Pear Shape, VVS-VS

10 x 7 mm (calibrated)

$ 12.29

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1.12ct Green Tourmaline, Emerald Cut, VS-SI

1.12ct Green Tourmaline, Emerald Cut, VS-SI

10.1 x 3.5 mm

$ 55.78

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30.81ct Brown Tiger'S Eye, Pear Shape, Opaque

30.81ct Brown Tiger'S Eye, Pear Shape, Opaque

30.5 x 20.1 mm

$ 26.33

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0.85ct Yellow Citrine, Heart, VVS

0.85ct Yellow Citrine, Heart, VVS

6.3 x 6.3 mm

$ 5.93

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3.59ct Violet Amethyst, Oval, Transparent

3.59ct Violet Amethyst, Oval, Transparent

12.5 x 8.6 mm

$ 21.46

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1.24ct Pink Tourmaline, Emerald Cut, VVS

1.24ct Pink Tourmaline, Emerald Cut, VVS

13.3 x 3.5 mm

$ 93.74

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0.54ct Pink Morganite, Pear Shape, VVS

0.54ct Pink Morganite, Pear Shape, VVS

7.7 x 4.4 mm

$ 27.12

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37.96ct Violet Amethyst, Oval, VVS-VS
Amethyst Product Video (679952)

37.96ct Violet Amethyst, Oval, VVS-VS

23.1 x 18.7 mm

$ 302.47

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1.23ct Purple Spinel, Oval, VS

1.23ct Purple Spinel, Oval, VS

6.3 x 5.6 mm

$ 149.75

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3.28ctw Orange Hessonite Garnet, Emerald Cut, VS-SI

3.28ctw Orange Hessonite Garnet, Emerald Cut, VS-SI

8 x 6 mm (calibrated)

$ 50.31

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4.54ct Multicolor Quartz With Marcasite, Marquise, Transparent

4.54ct Multicolor Quartz With Marcasite, Marquise, Transparent

18 x 8.4 mm

$ 29.84

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2.13ct Orange Hessonite Garnet, Emerald Cut, VS

2.13ct Orange Hessonite Garnet, Emerald Cut, VS

7 x 7 mm (calibrated)

$ 42.00

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0.67ct Green Tourmaline, Emerald Cut, VVS

0.67ct Green Tourmaline, Emerald Cut, VVS

9.3 x 3.3 mm

$ 16.68

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1.58ct Violet Amethyst, Marquise, VS

1.58ct Violet Amethyst, Marquise, VS

11.9 x 6 mm

$ 10.39

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4.43ct Brown Mother Of Pearl, Fancy, Opaque

4.43ct Brown Mother Of Pearl, Fancy, Opaque

19.3 x 12.3 mm

$ 10.19

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0.78ct Green Chrome Diopside, Marquise, VS-SI

0.78ct Green Chrome Diopside, Marquise, VS-SI

9.8 x 4.8 mm

$ 19.42

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1.19ct Yellow Citrine, Round, VVS

1.19ct Yellow Citrine, Round, VVS

7 mm (calibrated)

$ 8.30

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1.40ct Multicolor Opal, Pear Shape, Transparent

1.40ct Multicolor Opal, Pear Shape, Transparent

11.1 x 8 mm

$ 65.95

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3.36ct Green Apatite, Emerald Cut, VS

3.36ct Green Apatite, Emerald Cut, VS

8.4 x 8.1 mm

$ 136.75

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3.86ct Orange Spessartite Garnet, Oval, Transparent

3.86ct Orange Spessartite Garnet, Oval, Transparent

8.9 x 8.4 mm

$ 96.11

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2.66ct Green Apatite, Emerald Cut, VS

2.66ct Green Apatite, Emerald Cut, VS

7.5 x 7.5 mm

$ 136.97

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

All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.

Posted By G.W. in June, 2025
Source: Bizrate

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

I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.

Posted By Tim W in February, 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 -> 10 star ratings

Found a rock that met my need. Bought it!

Posted By Skot in May, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

If you have motion picture, then I will be more satisfied with.

Posted By Ray in November, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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