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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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Yellow Untreated Gemstones
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9.60ct Yellow Apatite, Oval, VS
Apatite Product Video (387416)

9.60ct Yellow Apatite, Oval, VS

16.3 x 12.5 mm

$ 578.48

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1.18ct Green Tourmaline, Emerald Cut, VVS-VS

1.18ct Green Tourmaline, Emerald Cut, VVS-VS

6.2 x 5.2 mm

$ 58.76

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6.22ct Violet Amethyst, Pear Shape, VVS-VS

6.22ct Violet Amethyst, Pear Shape, VVS-VS

16 x 12 mm (calibrated)

$ 47.70

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4.35ct Green Prehnite, Oval, Transparent

4.35ct Green Prehnite, Oval, Transparent

9.8 x 9 mm

$ 23.65

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4.13ct Yellow Cat'S Eye Opal, Oval, Opaque

4.13ct Yellow Cat'S Eye Opal, Oval, Opaque

11 x 9 mm (calibrated)

$ 12.34

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2.05ct Orange Zircon, Oval, VVS-VS

2.05ct Orange Zircon, Oval, VVS-VS

8 x 6 mm (calibrated)

$ 56.68

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1.68ct Pink Tourmaline, Oval, VVS-VS
Tourmaline Product Video (525636)

1.68ct Pink Tourmaline, Oval, VVS-VS

7.5 x 6.7 mm

$ 257.68

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0.93ctw Green Peridot, Pear Shape, VVS-VS

0.93ctw Green Peridot, Pear Shape, VVS-VS

6 x 4 mm (calibrated)

$ 8.15

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1.28ct Brown Color-Change Garnet, Oval, VS

1.28ct Brown Color-Change Garnet, Oval, VS

6.8 x 5.6 mm

$ 102.26

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0.61ct Red Pyrope Garnet, Heart, VS

0.61ct Red Pyrope Garnet, Heart, VS

5 x 5 mm (calibrated)

$ 4.86

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1.05ct Orange Zircon, Oval, VS

1.05ct Orange Zircon, Oval, VS

5.9 x 4.9 mm

$ 15.69

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3.12ct Violet Amethyst, Trillion, VS

3.12ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 21.75

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9.35ct Brown Smoky Quartz, Emerald Cut, VVS-VS

9.35ct Brown Smoky Quartz, Emerald Cut, VVS-VS

12 x 12 mm (calibrated)

$ 25.61

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0.41ct Yellow Color-Change Diaspore, Oval, VS

0.41ct Yellow Color-Change Diaspore, Oval, VS

5.3 x 4.1 mm

$ 21.65

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1.86ctw Brown Tourmaline, Oval, VS

1.86ctw Brown Tourmaline, Oval, VS

6.3 x 4.7 mm

$ 70.40

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17.87ct Black Obsidian, Trillion, Opaque

17.87ct Black Obsidian, Trillion, Opaque

24.8 x 20.1 mm

$ 29.37

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0.53ct Pink Spinel, Cushion, VVS-VS

0.53ct Pink Spinel, Cushion, VVS-VS

4.7 x 4.3 mm

$ 36.95

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19.45ctw Multicolor Labradorite, Pear Shape, Translucent

19.45ctw Multicolor Labradorite, Pear Shape, Translucent

16 x 12 mm (calibrated)

$ 43.01

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0.12ct Green Alexandrite, Oval, VVS-VS

0.12ct Green Alexandrite, Oval, VVS-VS

4 x 3 mm (calibrated)

$ 83.66

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36.21ct Green Amazonite, Pear Shape, Opaque

36.21ct Green Amazonite, Pear Shape, Opaque

41.1 x 16 mm

$ 28.85

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19.34ct Multicolor Jasper, Oval, Opaque

19.34ct Multicolor Jasper, Oval, Opaque

27 x 20 mm (calibrated)

$ 14.20

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12.68ct Red Star Garnet, Oval, Opaque

12.68ct Red Star Garnet, Oval, Opaque

12.4 x 10.6 mm

$ 13.14

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3.32ctw Yellow Citrine, Square, VVS-VS

3.32ctw Yellow Citrine, Square, VVS-VS

7 x 7 mm (calibrated)

$ 25.46

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1.16ct Red Pyrope Garnet, Marquise, VVS-VS

1.16ct Red Pyrope Garnet, Marquise, VVS-VS

10 x 5 mm

$ 10.17

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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

Have made 2 purchases so far from GemSelect and they have been amazing! Anytime I requested additional info, videos or pictures of a particular item, the response was always timely and helpful. This is a great place to buy, if you are looking for loose stones. Highly recommend!

Posted By Britnee Rose 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

On the clarity options it goes "and better" so if youre looking for si specifically and you click si and better it still shows you basically everything. It just removes the opaques. Itd be nice if it was vs only, vss only, si only, etc

Posted By Iamnotakrustykrab in December, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

I think therea's no problem

Posted By Napoleon in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Great selection. Maybe too great i kept adding and deleting stuff because i found better looking ones

Posted By Edsor works in October, 2025
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
→ View All GemSelect Reviews on Bizrate
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