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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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17.51ct Violet Amethyst, Emerald Cut, VVS-VS

17.51ct Violet Amethyst, Emerald Cut, VVS-VS

20 x 15 mm (calibrated)

$ 122.08

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0.91ct Green Chrome Diopside, Marquise, VS-SI

0.91ct Green Chrome Diopside, Marquise, VS-SI

10 x 5 mm (calibrated)

$ 22.66

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12.31ctw Black Star Diopside, Oval, Opaque
Star Diopside Product Video (735006)

12.31ctw Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 61.30

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2.06ct Orange Moonstone, Cushion, Translucent

2.06ct Orange Moonstone, Cushion, Translucent

9 x 7 mm (calibrated)

$ 4.10

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3.84ctw White Topaz, Square, VVS-VS

3.84ctw White Topaz, Square, VVS-VS

4 x 4 mm (calibrated)

$ 30.92

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4.38ct Orange Sunstone, Oval, Translucent

4.38ct Orange Sunstone, Oval, Translucent

12 x 10 mm (calibrated)

$ 26.15

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0.94ct Green Tourmaline, Trillion, VS

0.94ct Green Tourmaline, Trillion, VS

7 x 6 mm

$ 109.23

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4.06ct Yellow Rutile Topaz, Pear Shape, Transparent

4.06ct Yellow Rutile Topaz, Pear Shape, Transparent

13.2 x 8 mm

$ 84.25

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1.07ct Yellow Color-Change Diaspore, Emerald Cut, VS

1.07ct Yellow Color-Change Diaspore, Emerald Cut, VS

7.8 x 4.8 mm

$ 55.98

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2.01ct Yellow Citrine, Square, VS

2.01ct Yellow Citrine, Square, VS

8 x 8 mm (calibrated)

$ 13.21

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17.24ct White Rainbow Moonstone, Pear Shape, Translucent

17.24ct White Rainbow Moonstone, Pear Shape, Translucent

27.7 x 12 mm

$ 120.20

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7.42ctw Yellow Citrine, Oval, VS

7.42ctw Yellow Citrine, Oval, VS

12 x 10 mm (calibrated)

$ 40.65

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4.63ct Multicolor Opal, Oval, Translucent

4.63ct Multicolor Opal, Oval, Translucent

17.4 x 8.9 mm

$ 102.28

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33.16ct White Rainbow Moonstone, Marquise, Transparent

33.16ct White Rainbow Moonstone, Marquise, Transparent

40.6 x 15.1 mm

$ 264.22

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19.44ct Violet Amethyst, Cushion, VVS-VS

19.44ct Violet Amethyst, Cushion, VVS-VS

20 x 15 mm (calibrated)

$ 135.54

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0.84ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

0.84ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

5.8 x 5.6 mm

$ 25.76

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7.10ctw Multicolor Labradorite, Baguette, Translucent

7.10ctw Multicolor Labradorite, Baguette, Translucent

9.3 x 7.3 mm

$ 9.76

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1.88ct Multicolor Opal, Oval, Transparent

1.88ct Multicolor Opal, Oval, Transparent

11.4 x 8.3 mm

$ 82.39

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71.43ct Yellow Quartz, Oval, VVS

71.43ct Yellow Quartz, Oval, VVS

33 x 20.9 mm

$ 97.82

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1.31ct Yellow Beryl, Round, VVS

1.31ct Yellow Beryl, Round, VVS

7 mm (calibrated)

$ 28.70

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1.25ct Blue Kyanite, Oval, SI

1.25ct Blue Kyanite, Oval, SI

7.1 x 5.5 mm

$ 31.13

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1.04ct Orange Hessonite Garnet, Pear Shape, VS-SI

1.04ct Orange Hessonite Garnet, Pear Shape, VS-SI

7 x 5 mm (calibrated)

$ 19.37

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28.79ct Green Aventurine, Fancy, Opaque

28.79ct Green Aventurine, Fancy, Opaque

28.8 x 9.6 mm

$ 2.39

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17.05ct Green Bloodstone, Oval, Opaque

17.05ct Green Bloodstone, Oval, Opaque

20.7 x 14.2 mm

$ 25.48

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 -> 9 star ratings

It was great!

Posted By Annie in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

It was good. There was a large selection at prices I could afford.

Posted By Zorah in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

My experience was done with ease

Posted By Barb in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.

Posted By Kelly in May, 2026
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

Overall Rating -> 10 star ratings

Great site for finding specific stones and sizes for individual pieces of jewelry

Posted By Designer in December, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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