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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
Untreated Gemstones Clarity
Untreated Gemstones Price
Untreated Gemstones Treatment

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For Example: 8-9
Bi-color Untreated Gemstones
Black Untreated Gemstones
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Multicolor Untreated Gemstones
Orange Untreated Gemstones
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Yellow Untreated Gemstones
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1.15ctw Brown Moonstone, Round, Translucent

1.15ctw Brown Moonstone, Round, Translucent

5 mm (calibrated)

$ 6.31

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53.31ct Violet Amethyst, Oval, VVS
Amethyst Product Video (724433)

53.31ct Violet Amethyst, Oval, VVS

27 x 20 mm (calibrated)

$ 399.29

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5.54ct Orange Sunstone, Oval, Translucent

5.54ct Orange Sunstone, Oval, Translucent

14 x 10 mm (calibrated)

$ 32.29

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0.97ctw Orange Citrine, Marquise, VVS-VS

0.97ctw Orange Citrine, Marquise, VVS-VS

8 x 4.1 mm

$ 5.40

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1.52ct Yellow Citrine, Emerald Cut, VVS

1.52ct Yellow Citrine, Emerald Cut, VVS

8 x 6 mm (calibrated)

$ 12.11

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9.66ct Brown Tiger'S Eye, Oval, Opaque

9.66ct Brown Tiger'S Eye, Oval, Opaque

18 x 13 mm (calibrated)

$ 5.68

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1.69ct Pink Tourmaline, Oval, Transparent

1.69ct Pink Tourmaline, Oval, Transparent

8 x 6 mm (calibrated)

$ 28.97

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7.33ct Multicolor Fire Agate, Fancy, Opaque

7.33ct Multicolor Fire Agate, Fancy, Opaque

15.7 x 10 mm

$ 57.26

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0.24ct Violet Iolite, Baguette, VS-SI

0.24ct Violet Iolite, Baguette, VS-SI

5 x 3 mm (calibrated)

$ 9.56

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1.29ct Multicolor Opal, Oval, Translucent

1.29ct Multicolor Opal, Oval, Translucent

10 x 8 mm (calibrated)

$ 51.39

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6.82ct Gray Quartz Cat'S Eye, Oval, Opaque

6.82ct Gray Quartz Cat'S Eye, Oval, Opaque

10.7 x 10.2 mm

$ 22.42

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3.48ct Yellow Cat'S Eye Apatite, Round, Transparent

3.48ct Yellow Cat'S Eye Apatite, Round, Transparent

8.5 mm (calibrated)

$ 26.69

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4.79ct Brown Smoky Quartz, Emerald Cut, VVS-VS

4.79ct Brown Smoky Quartz, Emerald Cut, VVS-VS

10.6 x 10.5 mm

$ 26.24

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1.45ct Multicolor Opal, Oval, Transparent

1.45ct Multicolor Opal, Oval, Transparent

10 x 8 mm (calibrated)

$ 36.11

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8.83ctw Violet Amethyst, Oval, Transparent

8.83ctw Violet Amethyst, Oval, Transparent

10 x 8 mm (calibrated)

$ 48.37

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1.23ct White Rainbow Moonstone, Oval, Transparent

1.23ct White Rainbow Moonstone, Oval, Transparent

8 x 6 mm (calibrated)

$ 39.20

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29.09ct Multicolor Rhodonite, Oval, Opaque

29.09ct Multicolor Rhodonite, Oval, Opaque

27.2 x 16.8 mm

$ 26.65

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4.90ct Violet Amethyst, Pear Shape, VS

4.90ct Violet Amethyst, Pear Shape, VS

15 x 10 mm (calibrated)

$ 37.58

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0.72ct White Rainbow Moonstone, Oval, Transparent

0.72ct White Rainbow Moonstone, Oval, Transparent

7 x 5 mm (calibrated)

$ 12.19

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1.41ct Green Sphene, Oval, Transparent

1.41ct Green Sphene, Oval, Transparent

7.3 x 5.6 mm

$ 7.02

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1.51ct White Cat'S Eye Moonstone, Oval, Transparent

1.51ct White Cat'S Eye Moonstone, Oval, Transparent

8 x 6 mm (calibrated)

$ 4.96

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27.71ct Blue Turquoise, Oval, Opaque

27.71ct Blue Turquoise, Oval, Opaque

24 x 17.6 mm

$ 82.80

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1.48ct Orange Hessonite Garnet, Oval, VS

1.48ct Orange Hessonite Garnet, Oval, VS

8.1 x 6.5 mm

$ 29.48

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8.10ct White Rutile Quartz, Oval, Transparent

8.10ct White Rutile Quartz, Oval, Transparent

15.1 x 11.1 mm

$ 22.19

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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

A pleasant experience and many choices to choose from

Posted By Krackenking in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I have purchased stones from gem select in the past and have been very satisfied. I expect to repeat that experience with this purchase as well

Posted By Marti in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I have shopped at Gemselect for nearly 20 years. I especially like that you see pictures of the exact gem you are purchasing. You are a trusted source.

Posted By DNaber in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

selection was broad and the check out was quick. Great site

Posted By JC Karl in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I had a very easy time navigating the web page and using filters to find what I was looking for. The varied selection was nice to see and pricing is clear and fair.

Posted By Mattick in May, 2026
Source: Bizrate
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