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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
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Untreated Gemstones Treatment

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Bi-color Untreated Gemstones
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Multicolor Untreated Gemstones
Orange Untreated Gemstones
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Yellow Untreated Gemstones
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0.25ct Orange Sphalerite, Round, SI

0.25ct Orange Sphalerite, Round, SI

3.7 mm

$ 12.45

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16.03ct Multicolor Jasper, Oval, Opaque

16.03ct Multicolor Jasper, Oval, Opaque

25 x 18 mm (calibrated)

$ 13.25

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0.80ct Red Spinel, Oval, VS-SI

0.80ct Red Spinel, Oval, VS-SI

5.8 x 4.9 mm

$ 66.40

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0.72ct Orange Zircon, Oval, VVS

0.72ct Orange Zircon, Oval, VVS

6 x 4 mm (calibrated)

$ 17.93

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42.00ct Violet Agate, Fancy, Translucent
Agate Product Video (433280)

42.00ct Violet Agate, Fancy, Translucent

26.2 x 26.2 mm

$ 29.28

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0.09ct Black Diamond, Round, Opaque

0.09ct Black Diamond, Round, Opaque

2.6 mm (calibrated)

$ 30.81

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0.83ct Green Peridot, Square, Transparent

0.83ct Green Peridot, Square, Transparent

5 x 5 mm (calibrated)

$ 6.06

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8.26ct Violet Amethyst, Pear Shape, VVS

8.26ct Violet Amethyst, Pear Shape, VVS

16.8 x 12.6 mm

$ 57.59

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13.75ct Green Jadeite, Oval, Translucent

13.75ct Green Jadeite, Oval, Translucent

20.6 x 16.4 mm

$ 37.67

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0.05ct Black Diamond, Round, Opaque

0.05ct Black Diamond, Round, Opaque

2.2 mm (calibrated)

$ 17.11

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9.00ct Multicolor Pietersite, Oval, Opaque

9.00ct Multicolor Pietersite, Oval, Opaque

16.3 x 11 mm

$ 21.78

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4.94ctw Purple Rhodolite Garnet, Trillion, VS

4.94ctw Purple Rhodolite Garnet, Trillion, VS

5.2 x 5.1 mm

$ 43.29

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5.48ct Brown Rutile Topaz, Pear Shape, Transparent

5.48ct Brown Rutile Topaz, Pear Shape, Transparent

18.5 x 7.9 mm

$ 113.71

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9.15ct Brown Tiger'S Eye, Cushion, Opaque

9.15ct Brown Tiger'S Eye, Cushion, Opaque

14 x 12 mm (calibrated)

$ 11.85

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37.48ct White Quartz, Oval, Transparent

37.48ct White Quartz, Oval, Transparent

28.2 x 24.2 mm

$ 41.07

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1.53ct Yellow Citrine, Emerald Cut, VVS-VS

1.53ct Yellow Citrine, Emerald Cut, VVS-VS

8 x 6 mm (calibrated)

$ 11.74

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1.31ct Brown Tourmaline, Oval, Transparent

1.31ct Brown Tourmaline, Oval, Transparent

8 x 6 mm (calibrated)

$ 22.46

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1.29ct Orange Clinohumite, Oval, SI-I1

1.29ct Orange Clinohumite, Oval, SI-I1

8 x 6 mm (calibrated)

$ 53.54

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1.43ct Multicolor Opal, Oval, Transparent

1.43ct Multicolor Opal, Oval, Transparent

10 x 8 mm (calibrated)

$ 34.37

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33.23ct Gray Hematite, Oval, Opaque

33.23ct Gray Hematite, Oval, Opaque

21.7 x 17.4 mm

$ 33.50

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9.21ct Blue Larimar, Oval, Opaque

9.21ct Blue Larimar, Oval, Opaque

16 x 12 mm (calibrated)

$ 109.00

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18.25ct White Rainbow Moonstone, Pear Shape, Translucent

18.25ct White Rainbow Moonstone, Pear Shape, Translucent

22.4 x 14.8 mm

$ 127.24

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0.90ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

0.90ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

7.4 x 4.7 mm

$ 47.02

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0.66ct Purple Spinel, Round, VS

0.66ct Purple Spinel, Round, VS

5 mm (calibrated)

$ 28.37

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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

Easy and good price

Posted By Bry_guy in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

So far So good

Posted By VH-1 in July, 2025
Source: Bizrate

Overall Rating -> 8 star ratings

First time using this website. It was both exciting finding things in my price range and things Iam gonna save up for and use in other pieces. I love that the picture of the gem is the exact gem I'll be buying. I haven't tested the gems yes but they said they sold me 100% natural gems.

Posted By Salvo in July, 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

Navigating the site was very easy and the photos of the exact gem you would be purchasing was well done.

Posted By HVeeder in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Filters need to be improved but rest of website is great

Posted By Rock hound in December, 2025
Source: Bizrate
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