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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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1.45ctw Red Rhodolite Garnet, Square, VVS-VS

1.45ctw Red Rhodolite Garnet, Square, VVS-VS

5 x 5 mm (calibrated)

$ 12.70

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1.39ct Brown Color-Change Garnet, Oval, VS

1.39ct Brown Color-Change Garnet, Oval, VS

7.3 x 5.7 mm

$ 111.05

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2.33ctw Violet Amethyst, Oval, VVS-VS

2.33ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 12.77

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1.01ct Yellow Color-Change Diaspore, Cushion, VVS

1.01ct Yellow Color-Change Diaspore, Cushion, VVS

10.9 x 3.8 mm

$ 35.41

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1.06ct Violet Amethyst, Marquise, VVS-VS

1.06ct Violet Amethyst, Marquise, VVS-VS

10 x 5 mm (calibrated)

$ 7.04

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0.77ct Multicolor Opal, Pear Shape, Transparent

0.77ct Multicolor Opal, Pear Shape, Transparent

8 x 6 mm (calibrated)

$ 19.17

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20.64ctw Black Spinel, Oval, Opaque

20.64ctw Black Spinel, Oval, Opaque

16 x 12 mm (calibrated)

$ 79.14

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1.58ctw Red Pyrope Garnet, Square, VS

1.58ctw Red Pyrope Garnet, Square, VS

5 x 5 mm (calibrated)

$ 12.12

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1.08ct Orange Hessonite Garnet, Emerald Cut, VVS-VS

1.08ct Orange Hessonite Garnet, Emerald Cut, VVS-VS

5 x 5 mm (calibrated)

$ 21.51

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35.50ct Brown Tiger'S Eye Matrix, Oval, Opaque

35.50ct Brown Tiger'S Eye Matrix, Oval, Opaque

31.8 x 20.8 mm

$ 35.36

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1.80ctw White Sillimanite Cat'S Eye, Oval, Transparent

1.80ctw White Sillimanite Cat'S Eye, Oval, Transparent

7.1 x 4.4 mm

$ 5.92

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29.20ctw Multicolor Fossil Coral, Cushion, Opaque

29.20ctw Multicolor Fossil Coral, Cushion, Opaque

18.9 x 11.5 mm

$ 33.27

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10.57ct Multicolor Pietersite, Pear Shape, Opaque

10.57ct Multicolor Pietersite, Pear Shape, Opaque

22.2 x 17 mm

$ 35.09

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3.94ctw Violet Amethyst, Oval, VVS-VS

3.94ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 19.62

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1.17ct Blue Kyanite, Oval, SI

1.17ct Blue Kyanite, Oval, SI

7 x 5 mm (calibrated)

$ 29.13

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3.01ct Violet Amethyst, Trillion, VVS-VS

3.01ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 20.98

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1.93ct Yellow Citrine, Round, VVS

1.93ct Yellow Citrine, Round, VVS

8 mm (calibrated)

$ 13.45

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3.94ctw Orange Hessonite Garnet, Cushion, VS-SI

3.94ctw Orange Hessonite Garnet, Cushion, VS-SI

8 x 6 mm (calibrated)

$ 78.48

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147.86ct Violet Amethyst, Oval, VVS
Amethyst Product Video (749647)

147.86ct Violet Amethyst, Oval, VVS

42.5 x 28.4 mm

$ 1,840.86

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0.18ctw Violet Iolite, Square, VS

0.18ctw Violet Iolite, Square, VS

2.6 x 2.5 mm

$ 7.17

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0.89ct Multicolor Chocolate Opal, Oval, Opaque

0.89ct Multicolor Chocolate Opal, Oval, Opaque

8 x 6 mm (calibrated)

$ 26.59

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11.20ct Pink Rose Quartz, Emerald Cut, Transparent

11.20ct Pink Rose Quartz, Emerald Cut, Transparent

14 x 14 mm (calibrated)

$ 61.35

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3.89ct Green Tourmaline, Oval, Transparent

3.89ct Green Tourmaline, Oval, Transparent

10 x 8 mm (calibrated)

$ 71.01

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4.40ctw Pink Rose Quartz, Emerald Cut, Transparent

4.40ctw Pink Rose Quartz, Emerald Cut, Transparent

8.5 x 8.5 mm

$ 24.10

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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

They have literally everything on this website! The prices are also pretty good, I was able to find plenty of nice stones that I could afford!

Posted By JC in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Loved the price and the quality and the certification options which is the main reason why I buy. The guarantee is also a great reason to use gem select.

Posted By Sal in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Navigating the site was very easy and the photos of the exact gem you would be purchasing was well done.

Posted By HVeeder in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Easy and functional

Posted By Dessa in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

They have a wonderful selection of gems of all sorts, shapes, cuts, and quality. I am very particular about the quality of stones I buy, and found many with VVS clarity and excellent cut and polish. I am thrilled with each of the stones I purchased, and would definitely recommend GemSelect to everyone.

Posted By Debsarabs in February, 2026
Source: Bizrate

Overall Rating -> 7 star ratings

Easy, quick.

Posted By Mich in June, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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