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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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Bi-color Untreated Gemstones
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2.32ct Multicolor Opal, Oval, Transparent

2.32ct Multicolor Opal, Oval, Transparent

11.8 x 8.8 mm

$ 103.98

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1.61ct Orange Hessonite Garnet, Emerald Cut, VS-SI

1.61ct Orange Hessonite Garnet, Emerald Cut, VS-SI

6 x 6 mm (calibrated)

$ 31.76

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11.61ct Black Tourmaline, Emerald Cut, Opaque

11.61ct Black Tourmaline, Emerald Cut, Opaque

17.5 x 10.3 mm

$ 57.82

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2.50ctw Multicolor Opal, Oval, Translucent

2.50ctw Multicolor Opal, Oval, Translucent

9 x 7 mm (calibrated)

$ 71.50

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8.33ct Pink Kunzite, Emerald Cut, VS

8.33ct Pink Kunzite, Emerald Cut, VS

13 x 9 mm (calibrated)

$ 207.42

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1.73ct Yellow Citrine, Round, VVS

1.73ct Yellow Citrine, Round, VVS

8 mm (calibrated)

$ 13.79

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8.29ct Multicolor Ruby-Zoisite, Baguette, Opaque
Ruby-Zoisite Product Video (338228)

8.29ct Multicolor Ruby-Zoisite, Baguette, Opaque

11.4 x 10.1 mm

$ 22.70

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2.17ct Red Almandine Garnet, Oval, VS

2.17ct Red Almandine Garnet, Oval, VS

9 x 7 mm (calibrated)

$ 81.05

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1.44ctw Blue Kyanite, Round, VS-SI

1.44ctw Blue Kyanite, Round, VS-SI

5.3 mm

$ 28.68

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0.05ct Black Diamond, Round, Opaque

0.05ct Black Diamond, Round, Opaque

2.1 mm (calibrated)

$ 39.84

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1.89ctw Blue Kyanite, Oval, SI

1.89ctw Blue Kyanite, Oval, SI

7 x 5 mm (calibrated)

$ 39.34

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5.13ct Black Star Diopside, Oval, Opaque

5.13ct Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 21.29

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7.24ct Multicolor Agate, Round, Opaque

7.24ct Multicolor Agate, Round, Opaque

11 mm (calibrated)

$ 7.21

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12.26ct Multicolor Jasper, Trillion, Opaque

12.26ct Multicolor Jasper, Trillion, Opaque

20.8 x 17.1 mm

$ 9.67

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15.51ct Purple Ruby-Zoisite, Flower Cut, Opaque

15.51ct Purple Ruby-Zoisite, Flower Cut, Opaque

16.9 x 15 mm

$ 18.84

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2.69ct Pink Strawberry Quartz, Oval, Transparent

2.69ct Pink Strawberry Quartz, Oval, Transparent

10 x 8 mm (calibrated)

$ 19.99

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0.58ct Red Spinel, Cushion, VVS-VS

0.58ct Red Spinel, Cushion, VVS-VS

5.5 x 4.7 mm

$ 48.14

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2.45ct Green Sphene, Oval, Transparent

2.45ct Green Sphene, Oval, Transparent

8.6 x 7.4 mm

$ 12.20

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0.23ct Black Diamond, Round, Opaque

0.23ct Black Diamond, Round, Opaque

3.5 mm (calibrated)

$ 109.41

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24.15ct Yellow Rutile Quartz, Pear Shape, Transparent
Rutile Quartz Product Video (403669)

24.15ct Yellow Rutile Quartz, Pear Shape, Transparent

23.9 x 18.6 mm

$ 139.97

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1.69ct Pink Morganite, Pear Shape, VS-SI
Morganite Product Video (457467)

1.69ct Pink Morganite, Pear Shape, VS-SI

11.5 x 6.4 mm

$ 140.27

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0.59ct Yellow Citrine, Pear Shape, VVS-VS

0.59ct Yellow Citrine, Pear Shape, VVS-VS

7 x 5 mm (calibrated)

$ 2.94

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7.07ct Brown Smoky Quartz, Round, VVS-VS

7.07ct Brown Smoky Quartz, Round, VVS-VS

13 mm (calibrated)

$ 11.62

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3.64ctw Violet Amethyst, Oval, VVS-VS

3.64ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 19.94

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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

A pleasant experience and many choices to choose from

Posted By Krackenking in November, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Nothing bad to report. Everything is as expected. The gems and the price are all very good.

Posted By Dafanatic in August, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Fast and reliable service.

Posted By Zæck in December, 2025
Source: Bizrate

Overall Rating -> 8 star ratings

Good prices

Posted By TRM in October, 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

Overall Rating -> 10 star ratings

Very pleasant

Posted By Varun in June, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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