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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
Untreated Gemstones Clarity
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Untreated Gemstones Treatment

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For Example: 8-9
Bi-color Untreated Gemstones
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Multicolor Untreated Gemstones
Orange Untreated Gemstones
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Yellow Untreated Gemstones
Single
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Lots
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4.91ct Pink Strawberry Quartz, Oval, Translucent

4.91ct Pink Strawberry Quartz, Oval, Translucent

12 x 10 mm (calibrated)

$ 58.68

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1.36ct Orange Zircon, Round, VS

1.36ct Orange Zircon, Round, VS

6.5 mm (calibrated)

$ 29.80

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2.09ct Green Tourmaline, Emerald Cut, VS

2.09ct Green Tourmaline, Emerald Cut, VS

17 x 3.9 mm

$ 57.25

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7.23ctw White Moonstone, Round, Translucent

7.23ctw White Moonstone, Round, Translucent

9 mm (calibrated)

$ 19.80

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1.33ct Red Spessartite Garnet, Emerald Cut, SI

1.33ct Red Spessartite Garnet, Emerald Cut, SI

6 x 6 mm (calibrated)

$ 62.66

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0.24ct Violet Iolite, Baguette, VS

0.24ct Violet Iolite, Baguette, VS

5 x 3 mm (calibrated)

$ 9.56

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8.83ct Brown Tiger'S Eye, Cushion, Opaque

8.83ct Brown Tiger'S Eye, Cushion, Opaque

14 x 12 mm (calibrated)

$ 8.80

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26.16ct White Howlite, Oval, Opaque

26.16ct White Howlite, Oval, Opaque

29.2 x 21.1 mm

$ 13.03

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1.56ctw Yellow Morganite, Pear Shape, VS

1.56ctw Yellow Morganite, Pear Shape, VS

8 x 6 mm (calibrated)

$ 85.46

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21.95ctw Blue Chalcedony, Flower Cut, Translucent
Chalcedony Product Video (485599)

21.95ctw Blue Chalcedony, Flower Cut, Translucent

13 x 13 mm (calibrated)

$ 24.05

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3.52ct Violet Amethyst, Briolette, VS
Amethyst Product Video (456833)

3.52ct Violet Amethyst, Briolette, VS

11.4 x 7.5 mm

$ 15.43

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1.25ct Multicolor Black Opal, Oval, Opaque

1.25ct Multicolor Black Opal, Oval, Opaque

9 x 7 mm (calibrated)

$ 32.87

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24.91ct Multicolor Amethyst Geode Slice, Fancy, Transparent

24.91ct Multicolor Amethyst Geode Slice, Fancy, Transparent

27 x 20 mm (calibrated)

$ 17.59

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2.85ctw Green Tsavorite Garnet, Round, VS-SI
Tsavorite Garnet Product Video (389842)

2.85ctw Green Tsavorite Garnet, Round, VS-SI

2.4 mm (calibrated)

$ 221.35

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8.75ct Green Actinolite Cat'S Eye, Oval, Translucent

8.75ct Green Actinolite Cat'S Eye, Oval, Translucent

14 x 12 mm (calibrated)

$ 61.01

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2.93ctw Brown Tiger'S Eye, Oval, Opaque

2.93ctw Brown Tiger'S Eye, Oval, Opaque

8 x 6 mm (calibrated)

$ 2.92

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5.83ct Yellow Star Moonstone, Oval, Translucent

5.83ct Yellow Star Moonstone, Oval, Translucent

13.2 x 10.6 mm

$ 25.55

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2.32ctw White Sillimanite Cat'S Eye, Oval, Transparent

2.32ctw White Sillimanite Cat'S Eye, Oval, Transparent

6.6 x 4.8 mm

$ 7.32

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1.61ct Pink Tourmaline, Emerald Cut, VS
Tourmaline Product Video (512167)

1.61ct Pink Tourmaline, Emerald Cut, VS

9.3 x 4.8 mm

$ 110.65

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5.13ct Orange Sunstone, Round, Translucent

5.13ct Orange Sunstone, Round, Translucent

11 mm (calibrated)

$ 56.21

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2.60ct Pink Strawberry Quartz, Oval, Transparent

2.60ct Pink Strawberry Quartz, Oval, Transparent

9 x 7 mm (calibrated)

$ 12.95

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1.84ct Red Pyrope Garnet, Marquise, VVS-VS

1.84ct Red Pyrope Garnet, Marquise, VVS-VS

11.8 x 6 mm

$ 18.21

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2.68ctw Green Peridot, Emerald Cut, VVS-VS
Peridot Product Video (474528)

2.68ctw Green Peridot, Emerald Cut, VVS-VS

6 x 4 mm (calibrated)

$ 66.73

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31.02ct Multicolor Jasper, Oval, Opaque

31.02ct Multicolor Jasper, Oval, Opaque

31.6 x 22.5 mm

$ 25.50

View Gem
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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

love the site, the experience and the products.

Posted By Ckingpots in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I was able to find what I wanted very easily!

Posted By Lenny in January, 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

The website was easy to use and informative of the selection of stones it has. I quickly found the right stone for me.

Posted By Guero in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Everything was great, website user friendly, quality amazing, communication amazing, delivery amazing, everything was as expected, they done what they said they would, overall experience was amazing.

Posted By Jac in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very good.

Posted By Tommy in December, 2025
Source: Bizrate
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