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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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21.65ct Multicolor Pietersite, Oval, Opaque

21.65ct Multicolor Pietersite, Oval, Opaque

25.9 x 15.8 mm

$ 71.88

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2.39ct Orange Hessonite Garnet, Emerald Cut, VS-SI

2.39ct Orange Hessonite Garnet, Emerald Cut, VS-SI

8.1 x 6.6 mm

$ 39.43

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5.54ctw Brown Tiger'S Eye, Oval, Opaque

5.54ctw Brown Tiger'S Eye, Oval, Opaque

10 x 8 mm (calibrated)

$ 8.28

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39.13ct Multicolor Jasper, Oval, Opaque

39.13ct Multicolor Jasper, Oval, Opaque

36.1 x 21.5 mm

$ 21.45

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3.99ctw Green Prehnite, Round, Transparent

3.99ctw Green Prehnite, Round, Transparent

7.5 mm (calibrated)

$ 21.68

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0.72ct Pink Tourmaline, Round, Transparent

0.72ct Pink Tourmaline, Round, Transparent

5.2 mm

$ 28.68

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45.45ctw Gray Hematite, Round, Opaque

45.45ctw Gray Hematite, Round, Opaque

17 mm (calibrated)

$ 44.32

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7.10ct White Rainbow Moonstone, Pear Shape, Translucent

7.10ct White Rainbow Moonstone, Pear Shape, Translucent

16.7 x 9.4 mm

$ 49.50

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2.63ct Orange Pyrope Garnet, Fancy, Translucent

2.63ct Orange Pyrope Garnet, Fancy, Translucent

12 x 9 mm

$ 6.59

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5.85ct Green Prehnite, Fancy, Transparent

5.85ct Green Prehnite, Fancy, Transparent

16.2 x 10.7 mm

$ 9.50

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5.64ctw Violet Amethyst, Oval, Transparent

5.64ctw Violet Amethyst, Oval, Transparent

10 x 8 mm (calibrated)

$ 30.89

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27.52ct Multicolor Jasper, Oval, Opaque

27.52ct Multicolor Jasper, Oval, Opaque

31.3 x 22.7 mm

$ 18.69

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2.39ctw White Rainbow Moonstone, Square, Transparent

2.39ctw White Rainbow Moonstone, Square, Transparent

2.9 x 2.9 mm

$ 37.76

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1.58ct White Sillimanite Cat'S Eye, Oval, Transparent

1.58ct White Sillimanite Cat'S Eye, Oval, Transparent

7.7 x 5.5 mm

$ 5.19

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1.47ct Green Tourmaline, Emerald Cut, VVS-VS

1.47ct Green Tourmaline, Emerald Cut, VVS-VS

17.2 x 3.1 mm

$ 35.42

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1.43ct Gray Sillimanite Cat'S Eye, Oval, Transparent

1.43ct Gray Sillimanite Cat'S Eye, Oval, Transparent

7.8 x 5.5 mm

$ 4.70

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1.40ct White Topaz, Oval, Transparent

1.40ct White Topaz, Oval, Transparent

10 x 10 mm (calibrated)

$ 7.67

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1.08ct Multicolor Opal, Oval, Translucent

1.08ct Multicolor Opal, Oval, Translucent

9 x 7 mm (calibrated)

$ 47.33

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5.32ct Yellow Moonstone, Oval, Translucent

5.32ct Yellow Moonstone, Oval, Translucent

11 x 9 mm (calibrated)

$ 11.71

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17.46ct Multicolor Agate, Oval, Opaque

17.46ct Multicolor Agate, Oval, Opaque

16.3 x 14.7 mm

$ 17.39

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3.34ct Yellow Citrine, Oval, VVS-VS

3.34ct Yellow Citrine, Oval, VVS-VS

12.5 x 7.5 mm

$ 25.61

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0.27ct Blue Iolite, Pear Shape, VS

0.27ct Blue Iolite, Pear Shape, VS

6 x 4 mm (calibrated)

$ 10.76

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6.72ct Multicolor Ruby In Fuchsite, Marquise, Translucent

6.72ct Multicolor Ruby In Fuchsite, Marquise, Translucent

26.1 x 11.4 mm

$ 50.29

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12.31ct White Rainbow Moonstone, Pear Shape, Transparent

12.31ct White Rainbow Moonstone, Pear Shape, Transparent

19.2 x 12.4 mm

$ 220.70

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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

Enjoy every moment

Posted By Ferns in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

All items were delivered on time with all items meeting or exceeding my expectations. Cut, clarity and color were very close to the photos and description.

Posted By Bob D in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

My current project is something BLUE . Opal earrings with matching tennis bracelet for her wedding. The opals and sixty two sapphires VVS & VS are AMAZINGLY BEAUTIFUL. The private jewelers were impressed by the clarity and inclusion free of the sapphires . I want to say thank you for the High quality sapphires that I purchased for my daughtera's wedding.

Posted By My real name Dean or Wandering about in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I loved it! Extensive inventory, great prices, I definitely will be buying from here again!

Posted By Lex in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.

Posted By Maggie in August, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Ita's a pretty good and simple way to find gems that youa're looking for amazing selection

Posted By Amman in May, 2026
Source: Bizrate
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