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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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For Example: 8-9
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Yellow Untreated Gemstones
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34.65ct Yellow Obsidian, Cushion, Opaque

34.65ct Yellow Obsidian, Cushion, Opaque

31.6 x 19.1 mm

$ 37.96

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1.22ct Purple Spinel, Cushion, VS

1.22ct Purple Spinel, Cushion, VS

7 x 6 mm

$ 182.27

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1.68ctw Blue Kyanite, Round, SI

1.68ctw Blue Kyanite, Round, SI

5 mm (calibrated)

$ 41.83

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5.71ctw Yellow Citrine, Oval, VS

5.71ctw Yellow Citrine, Oval, VS

11 x 9 mm (calibrated)

$ 31.28

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2.52ctw Red Rhodolite Garnet, Square, VS

2.52ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 22.05

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2.11ctw Green Demantoid Garnet, Oval, VS

2.11ctw Green Demantoid Garnet, Oval, VS

4.2 x 3.2 mm

$ 155.53

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33.07ct Multicolor Opal, Baguette, Opaque

33.07ct Multicolor Opal, Baguette, Opaque

25 x 22.1 mm

$ 98.81

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23.85ct Green Maw-Sit-Sit, Baguette, Opaque

23.85ct Green Maw-Sit-Sit, Baguette, Opaque

16.9 x 11.7 mm

$ 78.39

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2.47ctw Pink Strawberry Quartz, Round, Translucent

2.47ctw Pink Strawberry Quartz, Round, Translucent

7 mm (calibrated)

$ 14.89

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0.53ct Multicolor Opal, Pear Shape, Transparent

0.53ct Multicolor Opal, Pear Shape, Transparent

8 x 5 mm (calibrated)

$ 13.20

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2.08ct Violet Amethyst, Trillion, VS

2.08ct Violet Amethyst, Trillion, VS

9 x 9 mm (calibrated)

$ 15.95

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1.93ct Orange Hessonite Garnet, Emerald Cut, SI

1.93ct Orange Hessonite Garnet, Emerald Cut, SI

6 x 6 mm (calibrated)

$ 32.46

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4.84ct Violet Amethyst, Oval, Transparent

4.84ct Violet Amethyst, Oval, Transparent

12.7 x 9.9 mm

$ 28.93

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1.12ct Multicolor Opal, Oval, Transparent

1.12ct Multicolor Opal, Oval, Transparent

9 x 7 mm (calibrated)

$ 35.24

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1.42ctw Red Rhodolite Garnet, Square, VS

1.42ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 12.44

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2.41ctw Orange Moonstone, Cushion, Translucent

2.41ctw Orange Moonstone, Cushion, Translucent

6 x 6 mm (calibrated)

$ 4.80

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66.82ct Multicolor Rhodochrosite, Pear Shape, Opaque

66.82ct Multicolor Rhodochrosite, Pear Shape, Opaque

39.6 x 23.8 mm

$ 62.93

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3.34ct White Topaz, Oval, VVS

3.34ct White Topaz, Oval, VVS

10 x 8 mm (calibrated)

$ 23.29

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7.27ct Yellow Apatite, Oval, VS
Apatite Product Video (407293)

7.27ct Yellow Apatite, Oval, VS

14.9 x 11.3 mm

$ 238.95

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0.66ct Yellow Citrine, Heart, VVS-VS

0.66ct Yellow Citrine, Heart, VVS-VS

6 x 6 mm (calibrated)

$ 5.26

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1.60ct Gray Sillimanite Cat'S Eye, Oval, Transparent

1.60ct Gray Sillimanite Cat'S Eye, Oval, Transparent

7.2 x 5.3 mm

$ 5.00

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0.79ct Yellow Color-Change Diaspore, Pear Shape, VS

0.79ct Yellow Color-Change Diaspore, Pear Shape, VS

9.5 x 4.1 mm

$ 27.70

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18.38ctw White Rainbow Moonstone, Pear Shape, Transparent
Rainbow Moonstone Product Video (669280)

18.38ctw White Rainbow Moonstone, Pear Shape, Transparent

16.9 x 11.9 mm

$ 274.60

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11.07ct White Dendritic Agate, Pear Shape, Opaque

11.07ct White Dendritic Agate, Pear Shape, Opaque

20 x 15 mm (calibrated)

$ 8.82

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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 -> 9 star ratings

Will know more once order received

Posted By Jim in September, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

It was great!

Posted By Annie in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I can pick and choose from large selection and find just what I need for .y projects, currently my cane.

Posted By Darkstar731 in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Over pretty well experience the your website no complaints about it very easy reliable service provided

Posted By Blas in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Very neat and to the point

Posted By Botha in March, 2026
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
→ View All GemSelect Reviews on Bizrate
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