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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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25.50ct Multicolor Coral, Oval, Opaque

25.50ct Multicolor Coral, Oval, Opaque

32.5 x 22.6 mm

$ 37.44

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4.38ctw Red Pyrope Garnet, Marquise, VVS-VS

4.38ctw Red Pyrope Garnet, Marquise, VVS-VS

11.9 x 6 mm

$ 48.12

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6.10ctw White Moonstone, Round, Translucent

6.10ctw White Moonstone, Round, Translucent

9 mm (calibrated)

$ 16.72

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7.23ct Brown Smoky Quartz, Marquise, VVS-VS

7.23ct Brown Smoky Quartz, Marquise, VVS-VS

17.2 x 12 mm

$ 29.15

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5.37ct Multicolor Pietersite, Oval, Opaque

5.37ct Multicolor Pietersite, Oval, Opaque

13 x 9 mm (calibrated)

$ 13.00

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0.96ct Yellow Color-Change Diaspore, Cushion, VVS-VS

0.96ct Yellow Color-Change Diaspore, Cushion, VVS-VS

6.1 x 5.1 mm

$ 50.68

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4.10ctw Violet Amethyst, Oval, VS

4.10ctw Violet Amethyst, Oval, VS

6 x 4 mm (calibrated)

$ 26.95

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1.10ct Violet Spinel, Cushion, VVS

1.10ct Violet Spinel, Cushion, VVS

6 x 6 mm (calibrated)

$ 61.54

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3.45ctw Orange Citrine, Oval, VVS-VS

3.45ctw Orange Citrine, Oval, VVS-VS

9 x 7 mm (calibrated)

$ 26.46

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1.64ctw Multicolor Andalusite, Oval, VS

1.64ctw Multicolor Andalusite, Oval, VS

5 x 3.1 mm

$ 87.61

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1.56ctw Blue Kyanite, Round, SI

1.56ctw Blue Kyanite, Round, SI

5 mm (calibrated)

$ 38.84

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4.38ct Orange Spessartite Garnet, Oval, Transparent

4.38ct Orange Spessartite Garnet, Oval, Transparent

10 x 8 mm (calibrated)

$ 109.06

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1.60ct Green Tourmaline, Emerald Cut, VVS

1.60ct Green Tourmaline, Emerald Cut, VVS

17 x 3.7 mm

$ 38.56

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11.08ctw Brown Smoky Quartz, Marquise, Transparent

11.08ctw Brown Smoky Quartz, Marquise, Transparent

22 x 8.8 mm

$ 12.14

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11.67ct Multicolor Agate, Fancy, Translucent

11.67ct Multicolor Agate, Fancy, Translucent

17.9 x 8.3 mm

$ 20.43

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2.26ct Yellow Citrine, Trillion, VVS-VS

2.26ct Yellow Citrine, Trillion, VVS-VS

9 x 9 mm (calibrated)

$ 17.33

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7.60ctw Brown Tiger'S Eye, Round, Opaque

7.60ctw Brown Tiger'S Eye, Round, Opaque

10 mm (calibrated)

$ 7.57

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1.18ctw White Rainbow Moonstone, Marquise, Transparent

1.18ctw White Rainbow Moonstone, Marquise, Transparent

8 x 4 mm (calibrated)

$ 38.79

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1.74ct Pink Strawberry Quartz, Round, Translucent

1.74ct Pink Strawberry Quartz, Round, Translucent

8 mm (calibrated)

$ 13.35

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25.94ctw Multicolor Tiger'S Eye Matrix, Sphere / Ball, Opaque

25.94ctw Multicolor Tiger'S Eye Matrix, Sphere / Ball, Opaque

11 mm (calibrated)

$ 22.74

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2.19ct Orange Moonstone, Cushion, Translucent

2.19ct Orange Moonstone, Cushion, Translucent

9 x 7 mm (calibrated)

$ 4.37

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1.05ct Blue Cavansite, Fancy, Opaque

1.05ct Blue Cavansite, Fancy, Opaque

8.1 x 7.6 mm

$ 6.10

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1.13ct Green Chrysoberyl, Pear Shape, VVS

1.13ct Green Chrysoberyl, Pear Shape, VVS

7.1 x 5.9 mm

$ 108.97

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16.50ct Purple Ruby-Zoisite, Flower Cut, Opaque

16.50ct Purple Ruby-Zoisite, Flower Cut, Opaque

16.8 x 16.5 mm

$ 20.05

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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

I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.

Posted By Kelly in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Found a beautiful opal at a great price. I was not disappointed when it arrived. Even better in person.

Posted By Fried Rice in August, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Very easy to navigate with a great selection.

Posted By Bar181 in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I was able to find what I've been looking for.

Posted By Tree Dog in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Love beauty, color, quality, and price of these gems. Personal projects and will come here soon and everytime.

Posted By Darkstar in June, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

If you have motion picture, then I will be more satisfied with.

Posted By Ray in November, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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