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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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11.00ct Brown Star Sunstone, Oval, Opaque

11.00ct Brown Star Sunstone, Oval, Opaque

13 x 13 mm (calibrated)

$ 91.30

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3.15ct Pink Tourmaline, Emerald Cut, VS

3.15ct Pink Tourmaline, Emerald Cut, VS

9.6 x 6.6 mm

$ 155.31

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9.99ct Multicolor Agate, Fancy, Opaque

9.99ct Multicolor Agate, Fancy, Opaque

12 x 12 mm (calibrated)

$ 9.45

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14.51ctw Multicolor Jasper, Fancy, Opaque

14.51ctw Multicolor Jasper, Fancy, Opaque

20.1 x 11.1 mm

$ 8.75

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2.72ct Violet Amethyst, Trillion, VVS-VS

2.72ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 18.97

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19.03ct Multicolor Jasper, Oval, Opaque

19.03ct Multicolor Jasper, Oval, Opaque

20 x 15 mm (calibrated)

$ 15.64

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5.59ct Yellow Citrine, Oval, VVS-VS

5.59ct Yellow Citrine, Oval, VVS-VS

14 x 10 mm (calibrated)

$ 33.56

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2.07ctw White Sillimanite Cat'S Eye, Oval, Transparent

2.07ctw White Sillimanite Cat'S Eye, Oval, Transparent

6.7 x 4.4 mm

$ 6.53

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1.36ct Orange Sphalerite, Emerald Cut, SI-I1

1.36ct Orange Sphalerite, Emerald Cut, SI-I1

5.9 x 5.6 mm

$ 67.73

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13.82ct Multicolor Pietersite, Pear Shape, Opaque

13.82ct Multicolor Pietersite, Pear Shape, Opaque

28.3 x 13.4 mm

$ 34.41

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0.45ct White Rainbow Moonstone, Baguette, Transparent

0.45ct White Rainbow Moonstone, Baguette, Transparent

6 x 4 mm (calibrated)

$ 15.69

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4.40ct Yellow Citrine, Emerald Cut, VVS

4.40ct Yellow Citrine, Emerald Cut, VVS

11 x 9 mm (calibrated)

$ 33.75

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1.02ct Violet Amethyst, Marquise, VS

1.02ct Violet Amethyst, Marquise, VS

10 x 5 mm (calibrated)

$ 6.77

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21.09ct Multicolor Opal, Oval, Transparent

21.09ct Multicolor Opal, Oval, Transparent

25.4 x 16.5 mm

$ 525.14

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5.17ct Violet Amethyst, Pear Shape, Transparent

5.17ct Violet Amethyst, Pear Shape, Transparent

14 x 10 mm (calibrated)

$ 30.89

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2.28ct Pink Strawberry Quartz, Oval, Transparent

2.28ct Pink Strawberry Quartz, Oval, Transparent

10 x 8 mm (calibrated)

$ 16.94

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24.59ct Multicolor Jasper, Oval, Opaque

24.59ct Multicolor Jasper, Oval, Opaque

30.1 x 20.4 mm

$ 40.42

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8.03ctw Green Prehnite, Oval, Transparent/Translucent

8.03ctw Green Prehnite, Oval, Transparent/Translucent

8.3 x 7.5 mm

$ 43.99

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1.45ct Yellow Rutile Topaz, Marquise, Transparent

1.45ct Yellow Rutile Topaz, Marquise, Transparent

12.9 x 4.7 mm

$ 30.09

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1.38ct Orange Hessonite Garnet, Oval, VS

1.38ct Orange Hessonite Garnet, Oval, VS

8.1 x 6.5 mm

$ 27.49

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2.06ct Red Almandine Garnet, Marquise, VVS

2.06ct Red Almandine Garnet, Marquise, VVS

12 x 6 mm (calibrated)

$ 76.94

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6.00ct Green Amazonite, Marquise, Opaque

6.00ct Green Amazonite, Marquise, Opaque

20.2 x 10.1 mm

$ 14.39

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3.66ct Multicolor Labradorite, Baguette, Translucent

3.66ct Multicolor Labradorite, Baguette, Translucent

9 x 7 mm (calibrated)

$ 5.03

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5.93ct Yellow Citrine, Emerald Cut, VVS-VS

5.93ct Yellow Citrine, Emerald Cut, VVS-VS

11.1 x 10 mm

$ 45.48

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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 -> 9 star ratings

They have literally everything on this website! The prices are also pretty good, I was able to find plenty of nice stones that I could afford!

Posted By JC in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Excellent options

Posted By CJ in February, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Fast and reliable service.

Posted By Zæck in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The citrine gems are beautiful. I appreciated that each stone was individually shown on the website so I could see exactly what I was getting. No mystery person selecting random stones for me. The documentation included with each gem was high quality as well. Great price and arrived as expected.

Posted By Jen in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Easy process.

Posted By Crafty Seabee in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Although the stones are smaller than I thought, I really don't think in millimeters, they are perfect. I plan to put one into a ring and the other into a necklace. Ordering was easy, contact kept me aware of how shipping was going, and delivery was sooner than expected. The quality of stones I have ordered in the past and this recent order is outstanding and stones I will be proud to wear.

Posted By Ktreva52 in June, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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