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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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Yellow Untreated Gemstones
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10.69ctw Yellow Rutile Quartz, Oval, Transparent

10.69ctw Yellow Rutile Quartz, Oval, Transparent

12 x 10 mm (calibrated)

$ 37.27

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5.64ct Green Malachite, Oval, Opaque

5.64ct Green Malachite, Oval, Opaque

14 x 10 mm (calibrated)

$ 5.62

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7.08ct Turquoise Fluorite, Oval, Transparent

7.08ct Turquoise Fluorite, Oval, Transparent

12 x 10 mm (calibrated)

$ 27.67

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15.62ct Violet Amethyst, Oval, VVS
Amethyst Product Video (606949)

15.62ct Violet Amethyst, Oval, VVS

19.1 x 13.3 mm

$ 119.79

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16.78ct Black Tourmaline, Oval, Opaque

16.78ct Black Tourmaline, Oval, Opaque

20 x 15 mm (calibrated)

$ 83.56

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1.82ct Orange Hessonite Garnet, Oval, VS

1.82ct Orange Hessonite Garnet, Oval, VS

8 x 6.8 mm

$ 31.76

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2.89ct Orange Hessonite Garnet, Oval, VS-SI

2.89ct Orange Hessonite Garnet, Oval, VS-SI

9.5 x 7.6 mm

$ 46.51

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1.31ct Yellow Color-Change Diaspore, Pear Shape, VVS-VS

1.31ct Yellow Color-Change Diaspore, Pear Shape, VVS-VS

11.9 x 4.9 mm

$ 45.92

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0.50ct Yellow Color-Change Diaspore, Square, VS

0.50ct Yellow Color-Change Diaspore, Square, VS

4.5 x 4.5 mm

$ 18.96

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19.43ct Multicolor Jasper, Oval, Opaque

19.43ct Multicolor Jasper, Oval, Opaque

28.5 x 19.5 mm

$ 11.29

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11.92ct Brown Rutile Quartz, Pear Shape, Transparent

11.92ct Brown Rutile Quartz, Pear Shape, Transparent

18 x 13 mm (calibrated)

$ 32.39

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5.15ctw Multicolor Opal, Square, Transparent

5.15ctw Multicolor Opal, Square, Transparent

4.6 x 4.5 mm

$ 36.56

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1.66ct Orange Zircon, Round, VVS-VS

1.66ct Orange Zircon, Round, VVS-VS

6.5 mm (calibrated)

$ 36.37

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1.43ct Orange Hessonite Garnet, Oval, VVS-VS

1.43ct Orange Hessonite Garnet, Oval, VVS-VS

7.5 x 6.2 mm

$ 21.85

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3.03ct Purple Kunzite, Cushion, VVS
Kunzite Product Video (691182)

3.03ct Purple Kunzite, Cushion, VVS

8.7 x 8 mm

$ 83.38

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0.60ct Blue Kyanite, Round, SI

0.60ct Blue Kyanite, Round, SI

5 mm (calibrated)

$ 14.94

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2.54ct White Moonstone, Oval, Transparent

2.54ct White Moonstone, Oval, Transparent

10 x 8 mm (calibrated)

$ 20.24

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1.75ct Orange Hessonite Garnet, Oval, VS

1.75ct Orange Hessonite Garnet, Oval, VS

8 x 6.6 mm

$ 34.86

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3.15ct Yellow Citrine, Oval, VVS

3.15ct Yellow Citrine, Oval, VVS

11 x 9 mm (calibrated)

$ 21.96

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33.56ct Multicolor Rhodochrosite, Fancy, Translucent

33.56ct Multicolor Rhodochrosite, Fancy, Translucent

27.8 x 18.4 mm

$ 44.12

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12.81ct Multicolor Agate, Oval, Opaque

12.81ct Multicolor Agate, Oval, Opaque

15.3 x 14.1 mm

$ 10.63

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2.84ctw Red Rhodolite Garnet, Square, VS

2.84ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 24.86

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2.17ct Pink Tourmaline, Emerald Cut, VS

2.17ct Pink Tourmaline, Emerald Cut, VS

7.4 x 6.3 mm

$ 164.04

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0.92ct Multicolor Chocolate Opal, Oval, Opaque

0.92ct Multicolor Chocolate Opal, Oval, Opaque

8 x 6 mm (calibrated)

$ 27.49

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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

The website has a good selection, the interface is very intuitive.

Posted By PhoenixFeatherJewelry in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

the selection is good as are the prices

Posted By Old man in August, 2025
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Overall Rating -> 10 star ratings

Love, and have always loved, your website.

Posted By Aberabic in July, 2025
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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
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Overall Rating -> 10 star ratings

Very large selection from affordable to high end I will be coming back to shop again!

Posted By GreenGator in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I am filling a small treasure chest and picked a nice amethyst.

Posted By VinnyD in August, 2025
Source: Bizrate
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