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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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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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0.15ct Green Kornerupine, Square, VVS

0.15ct Green Kornerupine, Square, VVS

3 x 3 mm (calibrated)

$ 8.22

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2.70ct Pink Tourmaline, Oval, Transparent

2.70ct Pink Tourmaline, Oval, Transparent

9 x 7 mm (calibrated)

$ 49.29

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1.07ct Red Rhodolite Garnet, Oval, VS

1.07ct Red Rhodolite Garnet, Oval, VS

7 x 5 mm (calibrated)

$ 28.42

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5.42ct Pink Rose Quartz, Round, Transparent

5.42ct Pink Rose Quartz, Round, Transparent

11 mm (calibrated)

$ 29.69

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1.25ct Green Sphene, Oval, Transparent

1.25ct Green Sphene, Oval, Transparent

7.8 x 6.5 mm

$ 6.23

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0.17ctw White Diamond, Round, VVS-VS

0.17ctw White Diamond, Round, VVS-VS

2.8 mm (calibrated)

$ 303.91

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1.13ct Purple Spinel, Cushion, VVS-VS

1.13ct Purple Spinel, Cushion, VVS-VS

6.4 x 5.6 mm

$ 112.55

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16.43ctw Multicolor Fossil Coral, Trillion, Opaque

16.43ctw Multicolor Fossil Coral, Trillion, Opaque

21.4 x 13 mm

$ 17.99

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33.09ct Green Aventurine, Fancy, Opaque

33.09ct Green Aventurine, Fancy, Opaque

40.1 x 10.5 mm

$ 2.75

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10.47ct Multicolor Quartz With Marcasite, Pear Shape, Transparent

10.47ct Multicolor Quartz With Marcasite, Pear Shape, Transparent

25.4 x 12.1 mm

$ 57.36

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1.22ct Orange Sunstone, Oval, Translucent

1.22ct Orange Sunstone, Oval, Translucent

8 x 6 mm (calibrated)

$ 8.51

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5.41ct Multicolor Boulder Opal, Cushion, Opaque

5.41ct Multicolor Boulder Opal, Cushion, Opaque

14 x 10 mm (calibrated)

$ 26.94

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1.76ctw Multicolor Andalusite, Oval, VS

1.76ctw Multicolor Andalusite, Oval, VS

5.7 x 4 mm

$ 96.41

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93.75ctw Multicolor Rhodochrosite, Sphere / Ball, Opaque
Rhodochrosite Product Video (447522)

93.75ctw Multicolor Rhodochrosite, Sphere / Ball, Opaque

16.9 mm

$ 186.75

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1.70ct Orange Hessonite Garnet, Oval, VVS-VS

1.70ct Orange Hessonite Garnet, Oval, VVS-VS

8 x 6.7 mm

$ 33.86

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1.41ct Orange Hessonite Garnet, Square, VS-SI

1.41ct Orange Hessonite Garnet, Square, VS-SI

6 x 6 mm (calibrated)

$ 23.66

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4.07ctw Violet Amethyst, Oval, VVS-VS

4.07ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 22.30

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3.10ct Brown Rutile Topaz, Emerald Cut, Transparent

3.10ct Brown Rutile Topaz, Emerald Cut, Transparent

11.1 x 6.3 mm

$ 64.33

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0.50ct Green Peridot, Oval, VS

0.50ct Green Peridot, Oval, VS

6.3 x 4.4 mm

$ 6.97

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1.40ctw Green Demantoid Garnet, Oval, VS

1.40ctw Green Demantoid Garnet, Oval, VS

4.5 x 3.6 mm

$ 153.38

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1.30ct Blue Kyanite, Oval, SI

1.30ct Blue Kyanite, Oval, SI

7 x 5 mm (calibrated)

$ 32.37

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5.32ct Violet Amethyst, Pear Shape, VVS-VS

5.32ct Violet Amethyst, Pear Shape, VVS-VS

15 x 10 mm (calibrated)

$ 40.79

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7.95ctw Violet Amethyst, Oval, Transparent

7.95ctw Violet Amethyst, Oval, Transparent

11 x 9 mm (calibrated)

$ 31.44

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7.55ct Turquoise Hemimorphite Druzy, Fancy, Opaque
Hemimorphite Druzy Product Video (439432)

7.55ct Turquoise Hemimorphite Druzy, Fancy, Opaque

13.5 x 11.2 mm

$ 124.09

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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

Very good place to buy gemstones

Posted By Elansary in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Took a chance on purchasing my gemstones from Gemselect and was impressed. 10/10

Posted By KT in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

this site is awesome. I was able to look at the products think about purchasing and come back and find the same products. With the amount of inventory gem select has. Its awesome to be able to filter the way that they allow you too.

Posted By Tommyp in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.

Posted By Tim W in February, 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 -> 8 star ratings

It was fine

Posted By Na in April, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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