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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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Multicolor Untreated Gemstones
Orange Untreated Gemstones
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0.62ct Violet Amethyst, Emerald Cut, VS

0.62ct Violet Amethyst, Emerald Cut, VS

6 x 4 mm (calibrated)

$ 3.60

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1.78ct Orange Hessonite Garnet, Cushion, VS

1.78ct Orange Hessonite Garnet, Cushion, VS

7 x 7 mm (calibrated)

$ 33.61

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15.14ct Green Bloodstone, Pear Shape, Opaque

15.14ct Green Bloodstone, Pear Shape, Opaque

19.6 x 13.9 mm

$ 37.70

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3.57ctw Orange Moonstone, Trillion, Translucent

3.57ctw Orange Moonstone, Trillion, Translucent

8 x 8 mm (calibrated)

$ 7.15

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35.50ct Multicolor Jasper, Fancy, Opaque

35.50ct Multicolor Jasper, Fancy, Opaque

34 x 19.6 mm

$ 22.17

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1.39ct Green Tourmaline, Oval, Transparent

1.39ct Green Tourmaline, Oval, Transparent

7.3 x 5.8 mm

$ 23.04

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9.18ct Multicolor Boulder Opal, Cushion, Opaque

9.18ct Multicolor Boulder Opal, Cushion, Opaque

16.7 x 9.6 mm

$ 45.72

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6.66ct Black Star Diopside, Oval, Opaque

6.66ct Black Star Diopside, Oval, Opaque

12 x 10 mm (calibrated)

$ 33.17

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1.77ctw Red Pyrope Garnet, Marquise, VVS-VS

1.77ctw Red Pyrope Garnet, Marquise, VVS-VS

9.9 x 5 mm

$ 15.52

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2.93ct Pink Rose Quartz, Flower Cut, Transparent

2.93ct Pink Rose Quartz, Flower Cut, Transparent

13 x 9 mm (calibrated)

$ 7.48

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1.42ct Multicolor Opal, Marquise, Translucent

1.42ct Multicolor Opal, Marquise, Translucent

11.9 x 5.9 mm

$ 49.50

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2.00ct Orange Sunstone, Round, Translucent

2.00ct Orange Sunstone, Round, Translucent

9 mm (calibrated)

$ 10.87

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0.75ct Yellow Tourmaline, Round, Transparent

0.75ct Yellow Tourmaline, Round, Transparent

5.2 mm

$ 12.59

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9.99ct Green Maw-Sit-Sit, Pear Shape, Opaque

9.99ct Green Maw-Sit-Sit, Pear Shape, Opaque

14.8 x 11.7 mm

$ 30.87

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9.01ct Purple Ruby-Zoisite, Flower Cut, Opaque

9.01ct Purple Ruby-Zoisite, Flower Cut, Opaque

15 x 15 mm (calibrated)

$ 10.95

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0.70ct Orange Zircon, Oval, VVS-VS

0.70ct Orange Zircon, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 10.46

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0.71ct Blue Kyanite, Round, SI

0.71ct Blue Kyanite, Round, SI

5 mm (calibrated)

$ 17.68

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36.68ct Brown Tiger'S Eye, Fancy, Opaque

36.68ct Brown Tiger'S Eye, Fancy, Opaque

36.9 x 11 mm

$ 3.65

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4.48ctw Multicolor Spectrolite, Oval, Opaque

4.48ctw Multicolor Spectrolite, Oval, Opaque

10 x 8 mm (calibrated)

$ 20.48

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1.49ct Black Star Diopside, Round, Opaque

1.49ct Black Star Diopside, Round, Opaque

6 mm (calibrated)

$ 7.42

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27.54ct Violet Lepidolite, Fancy, Opaque

27.54ct Violet Lepidolite, Fancy, Opaque

39.5 x 9.6 mm

$ 8.23

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0.78ct Black Diamond, Round, Opaque
Diamond Product Video (669020)

0.78ct Black Diamond, Round, Opaque

5.3 mm

$ 621.50

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29.81ct Multicolor Opal, Round, Opaque

29.81ct Multicolor Opal, Round, Opaque

26 mm

$ 89.08

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1.05ct Green Peridot, Cushion, VS

1.05ct Green Peridot, Cushion, VS

7 x 5 mm (calibrated)

$ 18.82

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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

Gem Select has a user friendly website and the product is very good as is the price. The gems are described accurately and I always get what I think I'm getting.

Posted By Happy Customer in June, 2025
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 -> 8 star ratings

It was a good interaction I got a good gemstone for cheap

Posted By Jon in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

My whole experience is great.

Posted By Ghs in November, 2025
Source: Bizrate

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 site to navigate

Posted By Curt's Cabochons in June, 2025
Source: Bizrate
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