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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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5.75ctw Violet Amethyst, Trillion, VS

5.75ctw Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 45.82

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1.72ct Orange Hessonite Garnet, Round, VVS-VS

1.72ct Orange Hessonite Garnet, Round, VVS-VS

7 mm (calibrated)

$ 29.12

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0.52ct Green Tourmaline, Baguette, VVS-VS

0.52ct Green Tourmaline, Baguette, VVS-VS

5 x 3.7 mm

$ 18.13

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1.85ct Orange Hessonite Garnet, Oval, VS-SI

1.85ct Orange Hessonite Garnet, Oval, VS-SI

8.5 x 7 mm

$ 36.49

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11.62ct Green Uvarovite Garnet Drusy, Fancy, Opaque

11.62ct Green Uvarovite Garnet Drusy, Fancy, Opaque

19.1 x 11.3 mm

$ 17.36

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29.31ctw Multicolor Fossil Coral, Oval, Opaque

29.31ctw Multicolor Fossil Coral, Oval, Opaque

22.2 x 13.8 mm

$ 36.60

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1.28ct Purple Spinel, Cushion, VVS-VS
Spinel Product Video (754853)

1.28ct Purple Spinel, Cushion, VVS-VS

6.7 x 5.8 mm

$ 127.49

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2.48ctw Red Pyrope Garnet, Square, VS

2.48ctw Red Pyrope Garnet, Square, VS

4 x 4 mm (calibrated)

$ 19.02

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27.18ct Multicolor Tiger'S Eye Matrix, Oval, Opaque

27.18ct Multicolor Tiger'S Eye Matrix, Oval, Opaque

32.5 x 19.1 mm

$ 12.45

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3.16ctw Brown Smoky Quartz, Round, VS

3.16ctw Brown Smoky Quartz, Round, VS

8 mm (calibrated)

$ 6.92

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9.24ct Red Strawberry Quartz, Oval, Translucent

9.24ct Red Strawberry Quartz, Oval, Translucent

16 x 12 mm (calibrated)

$ 55.48

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5.74ct Pink Rose Quartz, Emerald Cut, Transparent

5.74ct Pink Rose Quartz, Emerald Cut, Transparent

12 x 12 mm (calibrated)

$ 31.44

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2.06ct Orange Hessonite Garnet, Emerald Cut, VS-SI

2.06ct Orange Hessonite Garnet, Emerald Cut, VS-SI

8 x 6 mm (calibrated)

$ 33.98

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27.29ctw Multicolor Fossil Coral, Cushion, Opaque

27.29ctw Multicolor Fossil Coral, Cushion, Opaque

19.3 x 13.3 mm

$ 34.08

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1.40ct Yellow Color-Change Diaspore, Emerald Cut, VS

1.40ct Yellow Color-Change Diaspore, Emerald Cut, VS

8.4 x 4.6 mm

$ 73.26

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8.45ct Pink Morganite, Pear Shape, Translucent

8.45ct Pink Morganite, Pear Shape, Translucent

17 x 11.1 mm

$ 92.58

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3.18ctw Red Pyrope Garnet, Heart, VVS-VS

3.18ctw Red Pyrope Garnet, Heart, VVS-VS

6 x 6 mm (calibrated)

$ 24.39

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3.30ct Multicolor Labradorite, Marquise, Translucent

3.30ct Multicolor Labradorite, Marquise, Translucent

14 x 7 mm (calibrated)

$ 7.30

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42.37ct Blue Turquoise, Oval, Opaque

42.37ct Blue Turquoise, Oval, Opaque

25.7 x 18.9 mm

$ 126.60

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22.46ctw Multicolor Jasper, Oval, Opaque

22.46ctw Multicolor Jasper, Oval, Opaque

20 x 15 mm (calibrated)

$ 36.91

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4.09ct Orange Spessartite Garnet, Pear Shape, Transparent

4.09ct Orange Spessartite Garnet, Pear Shape, Transparent

10.9 x 7.5 mm

$ 84.87

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0.61ct Yellow Color-Change Diaspore, Emerald Cut, VS

0.61ct Yellow Color-Change Diaspore, Emerald Cut, VS

7.1 x 4.2 mm

$ 21.41

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1.26ct Orange Sunstone, Oval, Translucent

1.26ct Orange Sunstone, Oval, Translucent

8 x 6 mm (calibrated)

$ 20.87

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3.69ct Multicolor Opal, Pear Shape, Translucent

3.69ct Multicolor Opal, Pear Shape, Translucent

12 x 12 mm (calibrated)

$ 91.88

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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

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 -> 10 star ratings

This is the first time I have used this site. I was dissatisfied with the quality of gems and supplies elsewhere and decided to try GemSelect. They are awesome! I was thrilled to see the variety and the great web performance. There was the ability to search for information as well as gems. Things like the clarity rating system and caret weight of the gems. I have always loved making things and I have just started to make jewelry as a business. However I have never made a ring before and have always wanted to. On GemSelect I was able to find good quality gems to use in my creations. I am so glad the website is so easy to use. Thank you GemSelect.

Posted By PickyShopper in April, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Easy to use. Many options to find the right gemstone

Posted By Liz in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

On the clarity options it goes "and better" so if youre looking for si specifically and you click si and better it still shows you basically everything. It just removes the opaques. Itd be nice if it was vs only, vss only, si only, etc

Posted By Iamnotakrustykrab in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I have been very happy with my prior purchases and enjoy the website experience.

Posted By Trouble in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

good navigation and simple interface.

Posted By Dave in April, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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