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Untreated Gemstones

Browse our selection of untreated gemstones featuring natural color, clarity and beauty without enhancements.

Untreated Gemstones Weight
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5.63ctw Violet Amethyst, Trillion, VS

5.63ctw Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 39.25

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1.44ct Brown Sillimanite Cat'S Eye, Oval, Transparent

1.44ct Brown Sillimanite Cat'S Eye, Oval, Transparent

7.6 x 5.1 mm

$ 4.30

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1.98ct Pink Strawberry Quartz, Round, Translucent

1.98ct Pink Strawberry Quartz, Round, Translucent

8 mm (calibrated)

$ 15.19

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2.47ctw Red Rhodolite Garnet, Square, VS

2.47ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 21.62

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16.10ct Brown Smoky Quartz, Emerald Cut, VVS

16.10ct Brown Smoky Quartz, Emerald Cut, VVS

14 x 14 mm (calibrated)

$ 44.11

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1.03ct Pink Tourmaline, Round, Transparent

1.03ct Pink Tourmaline, Round, Transparent

6.5 mm (calibrated)

$ 17.07

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1.10ct Multicolor Opal, Oval, Translucent

1.10ct Multicolor Opal, Oval, Translucent

10 x 8 mm (calibrated)

$ 42.62

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82.91ct Violet Amethyst, Oval, VVS
Amethyst Product Video (753783)

82.91ct Violet Amethyst, Oval, VVS

31.6 x 23.7 mm

$ 688.15

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19.08ctw Multicolor Fossil Coral, Cushion, Opaque

19.08ctw Multicolor Fossil Coral, Cushion, Opaque

16.3 x 12.5 mm

$ 41.82

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2.40ct Green Peridot, Cushion, VS

2.40ct Green Peridot, Cushion, VS

7.9 x 7.3 mm

$ 95.11

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1.97ctw Violet Amethyst, Marquise, VS

1.97ctw Violet Amethyst, Marquise, VS

10 x 5 mm (calibrated)

$ 13.08

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3.91ct Multicolor Labradorite, Marquise, Translucent

3.91ct Multicolor Labradorite, Marquise, Translucent

14 x 7 mm (calibrated)

$ 8.65

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21.54ct Gray Hematite, Marquise, Opaque

21.54ct Gray Hematite, Marquise, Opaque

24.2 x 10.6 mm

$ 21.71

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0.54ct Green Peridot, Emerald Cut, VS

0.54ct Green Peridot, Emerald Cut, VS

6 x 4 mm (calibrated)

$ 8.07

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1.54ct Orange Moonstone, Trillion, Translucent

1.54ct Orange Moonstone, Trillion, Translucent

7.9 x 7.6 mm

$ 3.07

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6.97ct Green Prehnite, Cushion, Translucent

6.97ct Green Prehnite, Cushion, Translucent

12 x 12 mm (calibrated)

$ 33.32

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6.95ct Yellow Citrine, Round, VVS-VS

6.95ct Yellow Citrine, Round, VVS-VS

12 mm (calibrated)

$ 53.30

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0.93ct Yellow Color-Change Diaspore, Cushion, VVS-VS

0.93ct Yellow Color-Change Diaspore, Cushion, VVS-VS

7 x 5 mm (calibrated)

$ 32.61

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1.67ct Pink Tourmaline, Oval, Transparent

1.67ct Pink Tourmaline, Oval, Transparent

8 x 6 mm (calibrated)

$ 28.63

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1.97ct Brown Smoky Quartz, Cushion, VVS

1.97ct Brown Smoky Quartz, Cushion, VVS

9 x 7 mm (calibrated)

$ 13.74

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4.51ct Yellow Citrine, Cushion, VVS-VS

4.51ct Yellow Citrine, Cushion, VVS-VS

13 x 9 mm (calibrated)

$ 34.59

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2.16ct Green Tourmaline, Emerald Cut, VVS-VS

2.16ct Green Tourmaline, Emerald Cut, VVS-VS

15.9 x 4.1 mm

$ 59.16

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2.41ctw Violet Amethyst, Oval, VVS-VS

2.41ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 13.21

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3.01ct Violet Amethyst, Trillion, VS

3.01ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 23.09

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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

My current project is something BLUE . Opal earrings with matching tennis bracelet for her wedding. The opals and sixty two sapphires VVS & VS are AMAZINGLY BEAUTIFUL. The private jewelers were impressed by the clarity and inclusion free of the sapphires . I want to say thank you for the High quality sapphires that I purchased for my daughtera's wedding.

Posted By My real name Dean or Wandering about in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Enjoy every moment

Posted By Ferns in October, 2025
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Overall Rating -> 10 star ratings

I was able to find what I've been looking for.

Posted By Tree Dog in April, 2026
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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
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Overall Rating -> 10 star ratings

Very neat and to the point

Posted By Botha in March, 2026
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Overall Rating -> 10 star ratings

Absolutely love Gem Select. I always know the quality and accuracy of information and photos are top notch. Highly recommend!

Posted By Matthew K. in May, 2026
Source: Bizrate
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