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Home › Gemstones › Untreated Gemstones

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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Untreated Gemstones Treatment

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1.61ctw Red Pyrope Garnet, Square, VVS-VS

1.61ctw Red Pyrope Garnet, Square, VVS-VS

5 x 5 mm (calibrated)

$ 12.35

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1.33ct Green Sphene, Oval, Transparent

1.33ct Green Sphene, Oval, Transparent

6.5 x 5.6 mm

$ 7.29

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4.92ct Green Prehnite, Fancy, Translucent

4.92ct Green Prehnite, Fancy, Translucent

14.4 x 10.4 mm

$ 8.08

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1.02ct Blue Kyanite, Oval, SI

1.02ct Blue Kyanite, Oval, SI

7 x 5 mm (calibrated)

$ 25.40

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1.21ct Orange Hessonite Garnet, Oval, VS

1.21ct Orange Hessonite Garnet, Oval, VS

7.3 x 5.9 mm

$ 24.10

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15.45ct Multicolor Agate, Oval, Opaque

15.45ct Multicolor Agate, Oval, Opaque

17.8 x 15.1 mm

$ 15.39

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0.44ct Yellow Citrine, Heart, VVS-VS

0.44ct Yellow Citrine, Heart, VVS-VS

5 x 5 mm (calibrated)

$ 3.50

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4.72ctw Yellow Citrine, Oval, VVS-VS

4.72ctw Yellow Citrine, Oval, VVS-VS

10 x 8 mm (calibrated)

$ 25.85

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1.37ctw Red Rhodolite Garnet, Square, VS

1.37ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 12.00

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3.63ctw Red Pyrope Garnet, Square, VS

3.63ctw Red Pyrope Garnet, Square, VS

4 x 4 mm (calibrated)

$ 27.84

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13.48ct Violet Amethyst, Emerald Cut, VVS-VS
Amethyst Product Video (713704)

13.48ct Violet Amethyst, Emerald Cut, VVS-VS

18 x 13 mm (calibrated)

$ 93.98

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6.76ct Green Prehnite, Fancy, Transparent

6.76ct Green Prehnite, Fancy, Transparent

19.4 x 10.6 mm

$ 9.41

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3.70ctw Red Pyrope Garnet, Marquise, VVS-VS

3.70ctw Red Pyrope Garnet, Marquise, VVS-VS

12.1 x 6.1 mm

$ 32.43

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1.43ct Brown Smoky Quartz, Round, VS-SI

1.43ct Brown Smoky Quartz, Round, VS-SI

8 mm (calibrated)

$ 6.27

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22.19ct Multicolor Pietersite, Oval, Opaque

22.19ct Multicolor Pietersite, Oval, Opaque

30 x 22 mm (calibrated)

$ 72.94

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28.79ct Brown Jasper, Fancy, Opaque

28.79ct Brown Jasper, Fancy, Opaque

34.5 x 10.9 mm

$ 5.74

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4.14ct Orange Sunstone, Oval, Translucent

4.14ct Orange Sunstone, Oval, Translucent

12 x 10 mm (calibrated)

$ 24.63

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1.37ct Green Tourmaline, Oval, Transparent

1.37ct Green Tourmaline, Oval, Transparent

8 x 6 mm (calibrated)

$ 23.49

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0.54ct Green Peridot, Emerald Cut, VVS-VS

0.54ct Green Peridot, Emerald Cut, VVS-VS

5.7 x 3.9 mm

$ 8.07

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1.71ct Yellow Citrine, Round, VVS

1.71ct Yellow Citrine, Round, VVS

8 mm (calibrated)

$ 11.92

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0.96ct Green Tourmaline, Round, Transparent

0.96ct Green Tourmaline, Round, Transparent

6 mm (calibrated)

$ 15.90

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3.28ct Yellow Citrine, Pear Shape, VVS-VS

3.28ct Yellow Citrine, Pear Shape, VVS-VS

12 x 10 mm (calibrated)

$ 20.58

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17.99ct White Rainbow Moonstone, Marquise, Transparent

17.99ct White Rainbow Moonstone, Marquise, Transparent

28.1 x 13 mm

$ 143.34

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1.29ct Green Tourmaline, Emerald Cut, VVS-VS

1.29ct Green Tourmaline, Emerald Cut, VVS-VS

13.8 x 3.4 mm

$ 64.24

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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

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

I feel Gemselect is a trustworthy company to buy from

Posted By Becky in October, 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

Great website, easy to navigate, and loads quickly. Have bought here before, very pleased!

Posted By SallyO in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.

Posted By Maggie in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

GemSelect is always my first choice for purchasing gemstones. The fact that the gems are always exactly as described and pictured on the website has earned my trust many times over. Even when I don't buy, I still love browsing all the beautiful stones. My new favorites are the bright green Tsavorites!

Posted By Lkcisneros in March, 2026
Source: Bizrate
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