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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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1.18ct Green Tourmaline, Emerald Cut, VVS-VS

1.18ct Green Tourmaline, Emerald Cut, VVS-VS

16.9 x 2.9 mm

$ 28.44

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2.38ct Orange Hessonite Garnet, Emerald Cut, SI

2.38ct Orange Hessonite Garnet, Emerald Cut, SI

9 x 6 mm (calibrated)

$ 39.26

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50.32ct Multicolor Chrysocolla, Fancy, Opaque
Chrysocolla Product Video (658364)

50.32ct Multicolor Chrysocolla, Fancy, Opaque

35.9 x 25.9 mm

$ 71.42

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13.53ct White Rainbow Moonstone, Oval, Translucent

13.53ct White Rainbow Moonstone, Oval, Translucent

19.1 x 12.6 mm

$ 13.48

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12.46ctw Green Prehnite, Fancy, Transparent

12.46ctw Green Prehnite, Fancy, Transparent

17.6 x 11.4 mm

$ 19.52

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2.50ct Pink Strawberry Quartz, Oval, Transparent

2.50ct Pink Strawberry Quartz, Oval, Transparent

9 x 7 mm (calibrated)

$ 12.45

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1.03ct Yellow Color-Change Diaspore, Cushion, VVS

1.03ct Yellow Color-Change Diaspore, Cushion, VVS

6.3 x 5.1 mm

$ 42.55

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34.70ct Multicolor Bloodstone, Pear Shape, Opaque

34.70ct Multicolor Bloodstone, Pear Shape, Opaque

33.6 x 24.3 mm

$ 15.89

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19.76ct Multicolor Jasper, Fancy, Opaque

19.76ct Multicolor Jasper, Fancy, Opaque

30.8 x 9.2 mm

$ 1.98

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7.38ct Green Prehnite, Fancy, Transparent

7.38ct Green Prehnite, Fancy, Transparent

18.6 x 11.9 mm

$ 11.56

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5.79ct Black Tourmaline, Oval, Opaque

5.79ct Black Tourmaline, Oval, Opaque

13.3 x 10.5 mm

$ 28.83

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6.22ctw Pink Strawberry Quartz, Oval, Transparent

6.22ctw Pink Strawberry Quartz, Oval, Transparent

11 x 9 mm (calibrated)

$ 32.83

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0.60ct Purple Spinel, Round, VS

0.60ct Purple Spinel, Round, VS

5 mm (calibrated)

$ 25.24

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4.37ctw Red Pyrope Garnet, Marquise, VVS-VS

4.37ctw Red Pyrope Garnet, Marquise, VVS-VS

10 x 5 mm (calibrated)

$ 38.30

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3.21ctw Orange Moonstone, Trillion, Translucent

3.21ctw Orange Moonstone, Trillion, Translucent

8 x 8 mm (calibrated)

$ 7.03

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1.53ct Green Tourmaline, Oval, Transparent

1.53ct Green Tourmaline, Oval, Transparent

8 x 6 mm (calibrated)

$ 25.36

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9.17ct Black Tourmaline, Emerald Cut, Opaque

9.17ct Black Tourmaline, Emerald Cut, Opaque

11 x 11 mm (calibrated)

$ 45.67

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11.33ct Blue Turquoise, Oval, Opaque

11.33ct Blue Turquoise, Oval, Opaque

15.5 x 13.4 mm

$ 35.32

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0.82ct Multicolor Opal, Round, Translucent

0.82ct Multicolor Opal, Round, Translucent

7 mm (calibrated)

$ 20.14

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8.59ct Black Tourmaline, Emerald Cut, Opaque

8.59ct Black Tourmaline, Emerald Cut, Opaque

14 x 10 mm (calibrated)

$ 42.78

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1.09ct Red Rhodolite Garnet, Oval, VS

1.09ct Red Rhodolite Garnet, Oval, VS

7 x 5 mm (calibrated)

$ 23.89

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10.83ctw Violet Amethyst, Cushion, VS

10.83ctw Violet Amethyst, Cushion, VS

15 x 9.1 mm

$ 64.72

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0.69ct Green Peridot, Marquise, VVS-VS

0.69ct Green Peridot, Marquise, VVS-VS

8 x 4 mm (calibrated)

$ 11.00

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0.98ct Multicolor Chocolate Opal, Oval, Translucent

0.98ct Multicolor Chocolate Opal, Oval, Translucent

8 x 6 mm (calibrated)

$ 32.21

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 the site, the experience and the products.

Posted By Ckingpots in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Wonderful purchase, can't wait to see the stone.

Posted By Tim in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I loved it! Extensive inventory, great prices, I definitely will be buying from here again!

Posted By Lex in April, 2026
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 -> 10 star ratings

selection was broad and the check out was quick. Great site

Posted By JC Karl in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Would have bought an indigo and selenite, but neither listed. But, you do offer quite a large assortment otherwise.

Posted By JD in July, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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