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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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15.43ct Pink Rose Quartz, Oval, Transparent

15.43ct Pink Rose Quartz, Oval, Transparent

18.6 x 14.1 mm

$ 33.81

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1.75ct Orange Hessonite Garnet, Cushion, VS

1.75ct Orange Hessonite Garnet, Cushion, VS

8 x 6 mm (calibrated)

$ 31.37

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38.55ct Multicolor Rhodochrosite, Sphere / Ball, Opaque

38.55ct Multicolor Rhodochrosite, Sphere / Ball, Opaque

15.9 mm

$ 84.47

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0.87ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

0.87ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

6.9 x 4 mm

$ 30.54

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3.39ct Yellow Citrine, Pear Shape, VVS-VS

3.39ct Yellow Citrine, Pear Shape, VVS-VS

12 x 10 mm (calibrated)

$ 21.27

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4.09ctw Orange Moonstone, Cushion, Translucent

4.09ctw Orange Moonstone, Cushion, Translucent

8 x 8 mm (calibrated)

$ 8.15

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2.15ct White Rainbow Moonstone, Oval, Transparent

2.15ct White Rainbow Moonstone, Oval, Transparent

9 x 7 mm (calibrated)

$ 36.59

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0.78ct Blue Kyanite, Round, VS

0.78ct Blue Kyanite, Round, VS

5 mm (calibrated)

$ 15.54

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13.34ctw Yellow Rutile Quartz, Oval, Transparent

13.34ctw Yellow Rutile Quartz, Oval, Transparent

12 x 10 mm (calibrated)

$ 51.15

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6.20ct Multicolor Boulder Opal, Oval, Opaque

6.20ct Multicolor Boulder Opal, Oval, Opaque

22.9 x 7.6 mm

$ 43.23

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1.76ct Orange Hessonite Garnet, Oval, VS

1.76ct Orange Hessonite Garnet, Oval, VS

8.5 x 6.9 mm

$ 52.43

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31.26ct Multicolor Tiger'S Eye Matrix, Oval, Opaque

31.26ct Multicolor Tiger'S Eye Matrix, Oval, Opaque

30.4 x 17.8 mm

$ 18.06

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7.43ct Pink Morganite, Trillion, Translucent

7.43ct Pink Morganite, Trillion, Translucent

13 x 13 mm (calibrated)

$ 81.41

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3.61ctw Orange Moonstone, Trillion, Translucent

3.61ctw Orange Moonstone, Trillion, Translucent

8 x 8 mm (calibrated)

$ 7.91

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1.66ct Purple Spinel, Cushion, VS

1.66ct Purple Spinel, Cushion, VS

7.1 x 5.6 mm

$ 115.74

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0.49ct Green Chrome Diopside, Oval, VS

0.49ct Green Chrome Diopside, Oval, VS

6 x 4 mm (calibrated)

$ 12.20

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1.38ct Violet Amethyst, Marquise, VS

1.38ct Violet Amethyst, Marquise, VS

11.9 x 5.6 mm

$ 10.59

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0.78ct Yellow Citrine, Marquise, VVS-VS

0.78ct Yellow Citrine, Marquise, VVS-VS

9 x 5.1 mm

$ 6.22

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3.06ct Yellow Citrine, Oval, VVS-VS

3.06ct Yellow Citrine, Oval, VVS-VS

11 x 9 mm (calibrated)

$ 19.11

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27.40ctw Multicolor Fossil Coral, Fancy, Opaque

27.40ctw Multicolor Fossil Coral, Fancy, Opaque

24.7 x 11.5 mm

$ 45.03

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16.25ct Violet Charoite, Cushion, Opaque

16.25ct Violet Charoite, Cushion, Opaque

16.8 x 13.2 mm

$ 26.88

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23.92ct Yellow Calcite, Pear Shape, Translucent

23.92ct Yellow Calcite, Pear Shape, Translucent

29.4 x 16.8 mm

$ 16.43

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2.08ct Yellow Citrine, Trillion, VS

2.08ct Yellow Citrine, Trillion, VS

9 x 9 mm (calibrated)

$ 15.95

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8.63ct Pink Rose Quartz, Emerald Cut, Transparent

8.63ct Pink Rose Quartz, Emerald Cut, Transparent

12 x 12 mm (calibrated)

$ 47.28

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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

Have made 2 purchases so far from GemSelect and they have been amazing! Anytime I requested additional info, videos or pictures of a particular item, the response was always timely and helpful. This is a great place to buy, if you are looking for loose stones. Highly recommend!

Posted By Britnee Rose 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 always purchase my stones from GemSelect, their products are high quality and customer service is always great. I also like the fact that I am able to purchase unique items

Posted By Desperaux in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The website was very easy to use.

Posted By Garnet in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.

Posted By G.W. in June, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

If you have motion picture, then I will be more satisfied with.

Posted By Ray in November, 2025
Source: Bizrate
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