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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
Untreated Gemstones Clarity
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Untreated Gemstones Treatment

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16.92ct Violet Amethyst, Oval, VS

16.92ct Violet Amethyst, Oval, VS

20 x 15 mm (calibrated)

$ 112.35

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0.66ct Orange Citrine, Oval, VVS-VS

0.66ct Orange Citrine, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 6.57

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0.55ct Purple Spinel, Round, VVS-VS

0.55ct Purple Spinel, Round, VVS-VS

4.7 mm

$ 28.84

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2.89ctw White Rainbow Moonstone, Square, Transparent

2.89ctw White Rainbow Moonstone, Square, Transparent

3 x 3 mm (calibrated)

$ 44.85

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3.84ctw Red Pyrope Garnet, Square, VS

3.84ctw Red Pyrope Garnet, Square, VS

4 x 4 mm (calibrated)

$ 29.45

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5.40ct Brown Smoky Quartz, Emerald Cut, VS

5.40ct Brown Smoky Quartz, Emerald Cut, VS

10.4 x 10.4 mm

$ 29.58

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2.67ct Multicolor Labradorite, Pear Shape, Translucent

2.67ct Multicolor Labradorite, Pear Shape, Translucent

10.5 x 7.5 mm

$ 5.91

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0.19ct Green Kornerupine, Round, SI
Kornerupine Product Video (564790)

0.19ct Green Kornerupine, Round, SI

3.5 mm (calibrated)

$ 65.24

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1.75ct Orange Zircon, Oval, VVS-VS

1.75ct Orange Zircon, Oval, VVS-VS

8 x 6 mm (calibrated)

$ 38.25

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5.69ctw Yellow Citrine, Oval, VVS-VS

5.69ctw Yellow Citrine, Oval, VVS-VS

10 x 8 mm (calibrated)

$ 28.34

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19.20ctw Green Amazonite, Round, Opaque

19.20ctw Green Amazonite, Round, Opaque

10 mm (calibrated)

$ 15.30

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1.64ctw Red Pyrope Garnet, Square, VS

1.64ctw Red Pyrope Garnet, Square, VS

5 x 5 mm (calibrated)

$ 12.58

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2.06ctw Red Pyrope Garnet, Marquise, VVS-VS

2.06ctw Red Pyrope Garnet, Marquise, VVS-VS

9.9 x 5 mm

$ 18.06

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8.65ct Turquoise Grandidierite, Oval, Translucent

8.65ct Turquoise Grandidierite, Oval, Translucent

15 x 11.8 mm

$ 249.05

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3.99ct Multicolor Fire Agate, Fancy, Opaque

3.99ct Multicolor Fire Agate, Fancy, Opaque

12.9 x 7.6 mm

$ 30.79

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19.29ctw Multicolor Jasper, Oval, Opaque

19.29ctw Multicolor Jasper, Oval, Opaque

20.6 x 14.3 mm

$ 11.62

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0.49ct Yellow Citrine, Cushion, VVS-VS

0.49ct Yellow Citrine, Cushion, VVS-VS

5 x 5 mm (calibrated)

$ 3.42

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1.45ct Green Tourmaline, Emerald Cut, VVS-VS

1.45ct Green Tourmaline, Emerald Cut, VVS-VS

16 x 3.2 mm

$ 30.47

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0.92ct Yellow Morganite, Oval, VS

0.92ct Yellow Morganite, Oval, VS

8 x 6 mm (calibrated)

$ 40.32

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1.56ct Orange Hessonite Garnet, Oval, VS

1.56ct Orange Hessonite Garnet, Oval, VS

7.9 x 6.5 mm

$ 27.75

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21.31ct Violet Amethyst, Cushion, VVS

21.31ct Violet Amethyst, Cushion, VVS

18 x 18 mm (calibrated)

$ 148.57

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0.95ct Purple Tourmaline, Oval, Transparent

0.95ct Purple Tourmaline, Oval, Transparent

6.6 x 5 mm

$ 15.75

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0.02ct Black Diamond, Round, Opaque

0.02ct Black Diamond, Round, Opaque

2 mm (calibrated)

$ 15.94

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31.19ct Violet Amethyst, Oval, VVS
Amethyst Product Video (679792)

31.19ct Violet Amethyst, Oval, VVS

24.5 x 20.1 mm

$ 248.52

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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

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

Overall Rating -> 9 star ratings

Nothing bad to report. Everything is as expected. The gems and the price are all very good.

Posted By Dafanatic in August, 2025
Source: Bizrate

Overall Rating -> 8 star ratings

The website was easy to use and there were a lot of good options, I was satisfied.

Posted By Brielly in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Web site is very simple to navigate Selection is terrific

Posted By ToRa.62 in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Found a beautiful opal at a great price. I was not disappointed when it arrived. Even better in person.

Posted By Fried Rice in August, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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