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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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Yellow Untreated Gemstones
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1.13ct Yellow Citrine, Round, VS

1.13ct Yellow Citrine, Round, VS

7 mm (calibrated)

$ 7.50

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3.49ct Orange Sunstone, Oval, Transparent

3.49ct Orange Sunstone, Oval, Transparent

11 x 9 mm (calibrated)

$ 21.00

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0.43ct Orange Spessartite Garnet, Oval, VS

0.43ct Orange Spessartite Garnet, Oval, VS

5.1 x 3.2 mm

$ 14.99

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13.95ct Brown Tiger'S Eye, Oval, Opaque

13.95ct Brown Tiger'S Eye, Oval, Opaque

20 x 15 mm (calibrated)

$ 15.29

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5.49ct Black Star Diopside, Oval, Opaque

5.49ct Black Star Diopside, Oval, Opaque

12 x 10 mm (calibrated)

$ 27.34

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2.46ct Orange Moonstone, Cushion, Translucent

2.46ct Orange Moonstone, Cushion, Translucent

9 x 7 mm (calibrated)

$ 4.90

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2.04ctw Orange Sunstone, Oval, Translucent

2.04ctw Orange Sunstone, Oval, Translucent

6 x 4 mm (calibrated)

$ 15.65

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0.97ct Violet Amethyst, Marquise, VS

0.97ct Violet Amethyst, Marquise, VS

10 x 5 mm (calibrated)

$ 6.44

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1.15ct Multicolor Opal, Oval, Transparent

1.15ct Multicolor Opal, Oval, Transparent

9 x 7 mm (calibrated)

$ 36.17

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1.39ct Yellow Sillimanite Cat'S Eye, Oval, Transparent

1.39ct Yellow Sillimanite Cat'S Eye, Oval, Transparent

7.7 x 5.2 mm

$ 4.57

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1.80ct Violet Amethyst, Pear Shape, VVS-VS

1.80ct Violet Amethyst, Pear Shape, VVS-VS

10 x 7 mm (calibrated)

$ 13.80

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5.35ct Yellow Citrine, Oval, VVS-VS

5.35ct Yellow Citrine, Oval, VVS-VS

14 x 10 mm (calibrated)

$ 32.12

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26.68ctw Multicolor Fossil Coral, Cushion, Opaque

26.68ctw Multicolor Fossil Coral, Cushion, Opaque

21.8 x 13.8 mm

$ 28.65

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19.17ct Green Serpentine, Oval, Translucent

19.17ct Green Serpentine, Oval, Translucent

26.8 x 16.5 mm

$ 41.05

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2.16ct Orange Hessonite Garnet, Cushion, SI

2.16ct Orange Hessonite Garnet, Cushion, SI

7.3 x 7.3 mm

$ 40.78

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0.58ct Pink Spinel, Cushion, VVS-VS

0.58ct Pink Spinel, Cushion, VVS-VS

5 x 4.5 mm

$ 40.44

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8.37ct Pink Kunzite, Pear Shape, VVS-VS

8.37ct Pink Kunzite, Pear Shape, VVS-VS

14 x 12 mm (calibrated)

$ 208.41

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2.84ct Pink Strawberry Quartz, Oval, Transparent

2.84ct Pink Strawberry Quartz, Oval, Transparent

9 x 7 mm (calibrated)

$ 18.15

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18.19ct Violet Amethyst, Pear Shape, VVS-VS

18.19ct Violet Amethyst, Pear Shape, VVS-VS

21.2 x 15.9 mm

$ 126.82

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1.14ct Multicolor Opal, Oval, Transparent

1.14ct Multicolor Opal, Oval, Transparent

9 x 7 mm (calibrated)

$ 35.86

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0.61ct Green Peridot, Emerald Cut, VVS-VS

0.61ct Green Peridot, Emerald Cut, VVS-VS

6 x 4 mm (calibrated)

$ 9.11

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2.33ct Red Almandine Garnet, Oval, VS

2.33ct Red Almandine Garnet, Oval, VS

9 x 7 mm (calibrated)

$ 87.03

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20.07ct White Dendritic Agate, Pear Shape, Translucent

20.07ct White Dendritic Agate, Pear Shape, Translucent

35.8 x 14.2 mm

$ 13.99

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86.18ct Red Star Garnet, Round, Opaque

86.18ct Red Star Garnet, Round, Opaque

25 mm

$ 89.27

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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

Great experience. I can't wait to explore on the website further.

Posted By Kymmie in September, 2025
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 -> 10 star ratings

this site is awesome. I was able to look at the products think about purchasing and come back and find the same products. With the amount of inventory gem select has. Its awesome to be able to filter the way that they allow you too.

Posted By Tommyp in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Good selection, using for custom jewlery for my wife.

Posted By Smitty in June, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Fast snd easy to find what I was looking for

Posted By Bawb in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

The website was very easy to use.

Posted By Garnet in January, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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