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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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Bi-color Untreated Gemstones
Black Untreated Gemstones
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Multicolor Untreated Gemstones
Orange Untreated Gemstones
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Yellow Untreated Gemstones
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2.74ct Green Fluorite, Pear Shape, Transparent

2.74ct Green Fluorite, Pear Shape, Transparent

10 x 7 mm (calibrated)

$ 10.91

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3.05ct Blue Chalcedony, Oval, Transparent

3.05ct Blue Chalcedony, Oval, Transparent

11 x 9 mm (calibrated)

$ 6.08

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2.63ct Yellow Citrine, Oval, VVS

2.63ct Yellow Citrine, Oval, VVS

11 x 9 mm (calibrated)

$ 18.33

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1.94ct Orange Moonstone, Trillion, Translucent

1.94ct Orange Moonstone, Trillion, Translucent

8 x 8 mm (calibrated)

$ 3.87

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1.43ct Orange Hessonite Garnet, Emerald Cut, VS-SI

1.43ct Orange Hessonite Garnet, Emerald Cut, VS-SI

7 x 5 mm (calibrated)

$ 23.51

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20.08ct Multicolor Jasper, Cushion, Opaque

20.08ct Multicolor Jasper, Cushion, Opaque

23.9 x 15.9 mm

$ 44.01

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2.19ctw Yellow Golden Beryl, Oval, VS

2.19ctw Yellow Golden Beryl, Oval, VS

8 x 6 mm (calibrated)

$ 54.53

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4.26ctw White Topaz, Square, VVS-VS

4.26ctw White Topaz, Square, VVS-VS

4 x 4 mm (calibrated)

$ 34.30

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1.22ct Green Tourmaline, Emerald Cut, VS-SI

1.22ct Green Tourmaline, Emerald Cut, VS-SI

15.3 x 3.2 mm

$ 25.80

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5.43ct Multicolor Fire Agate, Pear Shape, Opaque

5.43ct Multicolor Fire Agate, Pear Shape, Opaque

14.2 x 11.3 mm

$ 45.98

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1.30ctw Red Pyrope Garnet, Square, VVS-VS

1.30ctw Red Pyrope Garnet, Square, VVS-VS

5 x 5 mm (calibrated)

$ 9.97

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1.75ct Yellow Prehnite, Oval, Transparent/Translucent

1.75ct Yellow Prehnite, Oval, Transparent/Translucent

9 x 7 mm (calibrated)

$ 16.42

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1.90ct Orange Hessonite Garnet, Cushion, VVS-VS

1.90ct Orange Hessonite Garnet, Cushion, VVS-VS

6 x 6 mm (calibrated)

$ 28.30

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6.34ct Brown Smoky Quartz, Round, VVS-VS

6.34ct Brown Smoky Quartz, Round, VVS-VS

12 mm (calibrated)

$ 10.42

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8.89ctw Black Spinel, Round, Opaque

8.89ctw Black Spinel, Round, Opaque

10 mm (calibrated)

$ 29.22

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1.54ct Violet Amethyst, Trillion, VS

1.54ct Violet Amethyst, Trillion, VS

8 x 8 mm (calibrated)

$ 10.18

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9.98ct Multicolor Boulder Opal, Pear Shape, Opaque

9.98ct Multicolor Boulder Opal, Pear Shape, Opaque

21.9 x 14 mm

$ 49.70

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9.07ctw Multicolor Ruby In Fuchsite, Marquise, Translucent

9.07ctw Multicolor Ruby In Fuchsite, Marquise, Translucent

16.9 x 7.4 mm

$ 66.97

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6.42ct Black Tourmaline, Oval, Opaque

6.42ct Black Tourmaline, Oval, Opaque

12 x 10 mm (calibrated)

$ 31.97

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15.91ct Violet Amethyst, Emerald Cut, VVS

15.91ct Violet Amethyst, Emerald Cut, VVS

18 x 13 mm (calibrated)

$ 110.92

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1.86ct Green Sphene, Oval, Transparent

1.86ct Green Sphene, Oval, Transparent

8.2 x 6.3 mm

$ 9.26

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0.93ct Yellow Morganite, Cushion, VS

0.93ct Yellow Morganite, Cushion, VS

6 x 6 mm (calibrated)

$ 56.04

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8.54ct Black Tourmaline, Oval, Opaque

8.54ct Black Tourmaline, Oval, Opaque

14 x 12 mm (calibrated)

$ 42.53

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17.14ct White Howlite, Oval, Opaque

17.14ct White Howlite, Oval, Opaque

25 x 18 mm (calibrated)

$ 8.20

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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

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

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

I was looking for high-quality amethyst on this site, and I was able to compare size, color, and weight in detail before making a purchase.

Posted By Atsuhisa in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Very food

Posted By Keeto in July, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Very easy to navigate with a great selection.

Posted By Bar181 in August, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

I did not realize these stones were of jewelry quality. They are really beautiful, just not what I was expecting which was more of a natural stone.

Posted By Jewelry Quality Stones in July, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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