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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
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Untreated Gemstones Treatment

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For Example: 6-7
For Example: 8-9
Bi-color Untreated Gemstones
Black Untreated Gemstones
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Green Untreated Gemstones
Multicolor Untreated Gemstones
Orange Untreated Gemstones
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Yellow Untreated Gemstones
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7.62ct Brown Smoky Quartz, Round, VS

7.62ct Brown Smoky Quartz, Round, VS

14 mm (calibrated)

$ 12.52

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1.44ct Red Tourmaline, Oval, VVS-VS

1.44ct Red Tourmaline, Oval, VVS-VS

7.6 x 6.5 mm

$ 215.14

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4.66ct Green Prehnite, Fancy, Transparent

4.66ct Green Prehnite, Fancy, Transparent

15 x 10 mm (calibrated)

$ 7.30

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3.92ct Green Chrysoprase, Oval, Translucent

3.92ct Green Chrysoprase, Oval, Translucent

10 x 9 mm

$ 32.54

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40.49ctw Gray Hematite, Emerald Cut, Opaque

40.49ctw Gray Hematite, Emerald Cut, Opaque

20 x 15 mm (calibrated)

$ 35.90

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2.28ct Black Star Diopside, Oval, Opaque

2.28ct Black Star Diopside, Oval, Opaque

8 x 6 mm (calibrated)

$ 11.35

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29.47ct Black Nuummite, Oval, Opaque

29.47ct Black Nuummite, Oval, Opaque

25.5 x 19.4 mm

$ 123.35

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24.29ct Multicolor Labradorite, Oval, Opaque

24.29ct Multicolor Labradorite, Oval, Opaque

29.2 x 16.5 mm

$ 21.77

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2.14ct Yellow Citrine, Square, VVS

2.14ct Yellow Citrine, Square, VVS

7.6 x 7.4 mm

$ 12.52

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4.83ct Brown Smoky Quartz, Round, VVS-VS

4.83ct Brown Smoky Quartz, Round, VVS-VS

12 mm (calibrated)

$ 15.88

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0.76ct White Rainbow Moonstone, Oval, Transparent

0.76ct White Rainbow Moonstone, Oval, Transparent

7 x 5 mm (calibrated)

$ 12.87

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28.86ct Pink Coral, Fancy, Opaque
Coral Product Video (334123)

28.86ct Pink Coral, Fancy, Opaque

31.2 x 22.5 mm

$ 316.19

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4.75ct Brown Smoky Quartz, Fancy, VVS

4.75ct Brown Smoky Quartz, Fancy, VVS

21.8 x 9 mm

$ 23.66

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0.28ct Green Kornerupine, Oval, VS-SI

0.28ct Green Kornerupine, Oval, VS-SI

4.6 x 3.6 mm

$ 23.99

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1.10ct Yellow Citrine, Round, VVS

1.10ct Yellow Citrine, Round, VVS

7 mm (calibrated)

$ 8.76

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1.43ct Orange Hessonite Garnet, Oval, VS-SI

1.43ct Orange Hessonite Garnet, Oval, VS-SI

7.2 x 5.9 mm

$ 25.24

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13.82ctw Multicolor Jasper, Trillion, Opaque

13.82ctw Multicolor Jasper, Trillion, Opaque

16.8 x 14.5 mm

$ 7.85

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1.19ct Blue Kyanite, Oval, VS

1.19ct Blue Kyanite, Oval, VS

7 x 5 mm (calibrated)

$ 26.08

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12.46ctw Brown Tiger'S Eye, Baguette, Opaque

12.46ctw Brown Tiger'S Eye, Baguette, Opaque

12 x 10 mm (calibrated)

$ 12.41

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5.59ctw Multicolor Opal, Square, Transparent

5.59ctw Multicolor Opal, Square, Transparent

4.4 x 4.4 mm

$ 39.68

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0.40ct Green Peridot, Marquise, VS

0.40ct Green Peridot, Marquise, VS

7.5 x 3.5 mm

$ 5.98

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15.59ct Brown Moonstone, Fancy, Translucent

15.59ct Brown Moonstone, Fancy, Translucent

24.4 x 14.3 mm

$ 17.94

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1.54ct White Opal, Oval, Transparent

1.54ct White Opal, Oval, Transparent

9.1 x 7.4 mm

$ 31.96

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0.32ct Black Diamond, Square, Opaque

0.32ct Black Diamond, Square, Opaque

3.3 x 3.1 mm

$ 132.80

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 -> 8 star ratings

It was fine

Posted By Na in April, 2026
Source: Bizrate

Overall Rating -> 7 star ratings

Easy, quick.

Posted By Mich in June, 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

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 -> 9 star ratings

The purchasing process is fairly quick and straightforward and for me user friendly so it probably took more or less than 3 minutes to purchase and pay for the items. I wish there was a discount offer for multiple items to encourage us buyers to purchase more an incentive and add more sales in your end. Besides that, it's been a great purchasing experience and will continue to shop as I am a repeat customer and have bought from your store many times before. Thank you.

Posted By Emmanuel in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I love the product and the details about each of them.

Posted By Love It! in July, 2025
Source: Bizrate
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