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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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1.40ct Multicolor Pietersite, Marquise, Opaque

1.40ct Multicolor Pietersite, Marquise, Opaque

18 x 5 mm

$ 3.39

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2.07ctw Violet Amethyst, Marquise, VS

2.07ctw Violet Amethyst, Marquise, VS

10 x 5 mm (calibrated)

$ 13.74

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16.03ct Multicolor Rainbow Pyrite, Cushion, Opaque

16.03ct Multicolor Rainbow Pyrite, Cushion, Opaque

20 x 15 mm (calibrated)

$ 41.35

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2.25ctw Orange Moonstone, Cushion, Translucent

2.25ctw Orange Moonstone, Cushion, Translucent

6 x 6 mm (calibrated)

$ 4.93

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5.16ctw Green Prehnite, Oval, Transparent/Translucent

5.16ctw Green Prehnite, Oval, Transparent/Translucent

9.2 x 7.8 mm

$ 15.26

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4.85ctw Yellow Citrine, Oval, VVS-VS

4.85ctw Yellow Citrine, Oval, VVS-VS

10 x 8 mm (calibrated)

$ 26.58

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1.77ctw Green Peridot, Oval, VS

1.77ctw Green Peridot, Oval, VS

7 x 5 mm (calibrated)

$ 12.34

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0.80ct Yellow Beryl, Trillion, VVS

0.80ct Yellow Beryl, Trillion, VVS

7 x 7 mm (calibrated)

$ 15.94

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6.92ct Green Prehnite, Fancy, Transparent

6.92ct Green Prehnite, Fancy, Transparent

17.6 x 11.4 mm

$ 8.03

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263.05ct Pink Star Rose Quartz, Oval, Translucent
Star Rose Quartz Product Video (505880)

263.05ct Pink Star Rose Quartz, Oval, Translucent

39.1 x 35 mm

$ 432.31

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7.07ct Brown Tiger'S Eye, Baguette, Opaque

7.07ct Brown Tiger'S Eye, Baguette, Opaque

14 x 10 mm (calibrated)

$ 7.04

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1.75ct Orange Zircon, Oval, VVS

1.75ct Orange Zircon, Oval, VVS

8 x 6 mm (calibrated)

$ 38.55

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0.98ct Yellow Beryl, Oval, VVS-VS

0.98ct Yellow Beryl, Oval, VVS-VS

8 x 6 mm (calibrated)

$ 24.40

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1.10ct Green Peridot, Oval, VS

1.10ct Green Peridot, Oval, VS

7.5 x 5.9 mm

$ 9.86

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1.77ct Violet Amethyst, Pear Shape, VVS-VS

1.77ct Violet Amethyst, Pear Shape, VVS-VS

10 x 7 mm (calibrated)

$ 11.64

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0.82ct Green Sphene, Oval, Transparent

0.82ct Green Sphene, Oval, Transparent

5.5 x 5.2 mm

$ 4.08

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15.23ct Multicolor Coral, Oval, Translucent

15.23ct Multicolor Coral, Oval, Translucent

25 x 18 mm (calibrated)

$ 33.37

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1.01ct Yellow Beryl, Oval, VS

1.01ct Yellow Beryl, Oval, VS

8 x 6 mm (calibrated)

$ 20.12

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1.18ct Orange Hessonite Garnet, Oval, VS

1.18ct Orange Hessonite Garnet, Oval, VS

7.1 x 5.6 mm

$ 23.51

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6.92ct Blue Larimar, Round, Opaque

6.92ct Blue Larimar, Round, Opaque

12 mm (calibrated)

$ 79.05

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0.25ct Yellow Spessartite Garnet, Oval, VS-SI

0.25ct Yellow Spessartite Garnet, Oval, VS-SI

4.2 x 3.1 mm

$ 8.72

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4.28ctw Red Pyrope Garnet, Square, VS

4.28ctw Red Pyrope Garnet, Square, VS

4 x 4 mm (calibrated)

$ 32.83

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5.76ct Multicolor Quartz With Marcasite, Round, Transparent

5.76ct Multicolor Quartz With Marcasite, Round, Transparent

11 mm (calibrated)

$ 34.42

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14.23ct Black Nuummite, Oval, Opaque

14.23ct Black Nuummite, Oval, Opaque

18 x 16.2 mm

$ 58.40

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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 -> 8 star ratings

I visited several online loose stone shops trying to find rare stones. I finally found one that I've been looking for here, and very satisfied. Looking forward to receive the item in 3 weeks.

Posted By Atsu in December, 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

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

Easy to use. No issues. Large selection of gems.

Posted By CLTCJH in February, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

The website was easy to use and informative of the selection of stones it has. I quickly found the right stone for me.

Posted By Guero in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I love the products. I've bought them as gifts and people love my gifts

Posted By Love it! in February, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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