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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
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Untreated Gemstones Treatment

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0.74ct Green Tourmaline, Baguette, VS

0.74ct Green Tourmaline, Baguette, VS

6.6 x 3.9 mm

$ 25.80

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0.49ct Yellow Beryl, Pear Shape, VS

0.49ct Yellow Beryl, Pear Shape, VS

7 x 5 mm (calibrated)

$ 11.71

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6.55ct Violet Amethyst, Cushion, VVS-VS

6.55ct Violet Amethyst, Cushion, VVS-VS

18.2 x 9.1 mm

$ 39.14

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22.29ct Multicolor Pietersite, Oval, Opaque

22.29ct Multicolor Pietersite, Oval, Opaque

30 x 22 mm (calibrated)

$ 97.69

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0.12ct Black Diamond, Round, Opaque

0.12ct Black Diamond, Round, Opaque

3 mm (calibrated)

$ 41.08

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0.53ct Yellow Color-Change Diaspore, Baguette, VS

0.53ct Yellow Color-Change Diaspore, Baguette, VS

6.4 x 3.5 mm

$ 27.98

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0.54ct Green Cat'S Eye Alexandrite, Oval, Opaque

0.54ct Green Cat'S Eye Alexandrite, Oval, Opaque

4.7 x 4.3 mm

$ 112.05

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1.97ct Orange Moonstone, Cushion, Translucent

1.97ct Orange Moonstone, Cushion, Translucent

7 x 7 mm (calibrated)

$ 3.94

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7.35ct Violet Amethyst, Oval, Transparent

7.35ct Violet Amethyst, Oval, Transparent

14 x 12 mm (calibrated)

$ 43.01

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0.54ct Orange Sphalerite, Round, SI

0.54ct Orange Sphalerite, Round, SI

4.5 mm (calibrated)

$ 26.89

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2.06ct Orange Hessonite Garnet, Round, VS-SI

2.06ct Orange Hessonite Garnet, Round, VS-SI

8 mm (calibrated)

$ 45.14

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10.24ct Black Tourmaline, Emerald Cut, Opaque

10.24ct Black Tourmaline, Emerald Cut, Opaque

13.2 x 11.8 mm

$ 51.00

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1.60ct Yellow Beryl, Oval, VS

1.60ct Yellow Beryl, Oval, VS

9.1 x 6.6 mm

$ 31.87

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18.97ct White Howlite, Pear Shape, Opaque

18.97ct White Howlite, Pear Shape, Opaque

29.6 x 18.3 mm

$ 9.07

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38.74ctw Yellow Rutile Quartz, Sphere / Ball, Transparent

38.74ctw Yellow Rutile Quartz, Sphere / Ball, Transparent

14 mm (calibrated)

$ 42.44

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1.48ct Orange Hessonite Garnet, Cushion, VVS-VS

1.48ct Orange Hessonite Garnet, Cushion, VVS-VS

8 x 6 mm (calibrated)

$ 26.54

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25.70ct Multicolor Jasper, Oval, Opaque

25.70ct Multicolor Jasper, Oval, Opaque

28.3 x 17.3 mm

$ 20.27

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7.73ctw Brown Zircon, Oval, Transparent

7.73ctw Brown Zircon, Oval, Transparent

6.1 x 4.3 mm

$ 49.40

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4.44ct Violet Amethyst, Pear Shape, VVS

4.44ct Violet Amethyst, Pear Shape, VVS

14 x 10 mm (calibrated)

$ 29.18

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43.52ct Blue Turquoise, Oval, Opaque

43.52ct Blue Turquoise, Oval, Opaque

29.7 x 20.1 mm

$ 130.04

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10.65ct Multicolor Boulder Opal, Fancy, Opaque

10.65ct Multicolor Boulder Opal, Fancy, Opaque

20.2 x 13.2 mm

$ 53.04

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0.89ct Green Tourmaline, Emerald Cut, VS

0.89ct Green Tourmaline, Emerald Cut, VS

11.9 x 3 mm

$ 23.41

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0.66ct Multicolor Opal, Pear Shape, Transparent

0.66ct Multicolor Opal, Pear Shape, Transparent

7.9 x 5.7 mm

$ 16.43

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4.37ctw Pink Strawberry Quartz, Oval, Transparent

4.37ctw Pink Strawberry Quartz, Oval, Transparent

10 x 8 mm (calibrated)

$ 32.47

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

Love, and have always loved, your website.

Posted By Aberabic in July, 2025
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

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

Posted By Ray in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I have been very happy with my prior purchases and enjoy the website experience.

Posted By Trouble in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The stones are very nice.

Posted By Mvk in August, 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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