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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
Untreated Gemstones Clarity
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Untreated Gemstones Treatment

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3.21ct Violet Amethyst, Pear Shape, VS

3.21ct Violet Amethyst, Pear Shape, VS

12.8 x 9.4 mm

$ 24.62

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4.92ct Black Star Diopside, Oval, Opaque

4.92ct Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 24.50

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2.44ctw Violet Amethyst, Oval, VVS-VS

2.44ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 13.36

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3.44ctw White Rainbow Moonstone, Square, Transparent

3.44ctw White Rainbow Moonstone, Square, Transparent

3 x 3 mm (calibrated)

$ 64.08

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2.02ct Green Tourmaline, Emerald Cut, VS

2.02ct Green Tourmaline, Emerald Cut, VS

15.1 x 4.4 mm

$ 100.60

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0.70ctw Green Peridot, Marquise, VS

0.70ctw Green Peridot, Marquise, VS

6.9 x 3.4 mm

$ 6.13

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7.98ct Yellow Rutile Quartz, Round, Transparent

7.98ct Yellow Rutile Quartz, Round, Transparent

13 mm (calibrated)

$ 21.68

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7.50ct White Quartz Cat'S Eye, Round, Transparent

7.50ct White Quartz Cat'S Eye, Round, Transparent

12 mm (calibrated)

$ 26.63

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12.26ctw Violet Amethyst, Oval, Transparent

12.26ctw Violet Amethyst, Oval, Transparent

14.2 x 10.3 mm

$ 67.16

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3.79ctw Purple Rhodolite Garnet, Oval, VVS-VS

3.79ctw Purple Rhodolite Garnet, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 83.05

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6.29ct Yellow Citrine, Briolette, VVS

6.29ct Yellow Citrine, Briolette, VVS

13 x 9 mm (calibrated)

$ 35.49

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0.09ctw Black Diamond, Round, Opaque

0.09ctw Black Diamond, Round, Opaque

2 mm (calibrated)

$ 26.15

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1.27ct Green Sphene, Oval, Transparent

1.27ct Green Sphene, Oval, Transparent

6.3 x 5.7 mm

$ 6.32

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110.36ct Multicolor Agate, Oval, Opaque
Agate Product Video (692953)

110.36ct Multicolor Agate, Oval, Opaque

34.8 x 31.3 mm

$ 65.95

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6.12ct Green Malachite, Baguette, Opaque

6.12ct Green Malachite, Baguette, Opaque

11 x 9 mm (calibrated)

$ 7.71

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8.69ct Yellow Rutile Quartz, Oval, Transparent

8.69ct Yellow Rutile Quartz, Oval, Transparent

15.2 x 11.1 mm

$ 23.80

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11.63ctw Violet Amethyst, Oval, Transparent

11.63ctw Violet Amethyst, Oval, Transparent

14 x 10 mm (calibrated)

$ 63.71

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45.25ct Violet Amethyst, Oval, IF
Amethyst Product Video (751313)

45.25ct Violet Amethyst, Oval, IF

24.3 x 19 mm

$ 300.46

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18.70ct Purple Ruby-Zoisite, Flower Cut, Opaque

18.70ct Purple Ruby-Zoisite, Flower Cut, Opaque

19.3 x 19.1 mm

$ 22.72

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1.21ct Purple Spinel, Cushion, VVS-VS
Spinel Product Video (743034)

1.21ct Purple Spinel, Cushion, VVS-VS

6.6 x 6.1 mm

$ 200.86

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4.02ctw Multicolor Labradorite, Square, Transparent

4.02ctw Multicolor Labradorite, Square, Transparent

7 x 7 mm (calibrated)

$ 6.04

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4.32ct Yellow Citrine, Oval, VVS-VS

4.32ct Yellow Citrine, Oval, VVS-VS

12 x 10 mm (calibrated)

$ 23.66

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1.43ctw Red Rhodolite Garnet, Square, VS

1.43ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 12.52

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3.70ct Yellow Rutile Topaz, Oval, Transparent

3.70ct Yellow Rutile Topaz, Oval, Transparent

11.1 x 8.3 mm

$ 76.78

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 -> 10 star ratings

On the clarity options it goes "and better" so if youre looking for si specifically and you click si and better it still shows you basically everything. It just removes the opaques. Itd be nice if it was vs only, vss only, si only, etc

Posted By Iamnotakrustykrab in December, 2025
Source: Bizrate

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

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 -> 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

Enjoy viewing the selections. Excellent product

Posted By ToRa.62 in April, 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
→ View All GemSelect Reviews on Bizrate
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