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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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Yellow Untreated Gemstones
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6.87ct Multicolor Rainbow Pyrite, Pear Shape, Opaque

6.87ct Multicolor Rainbow Pyrite, Pear Shape, Opaque

16.5 x 11.1 mm

$ 20.53

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5.19ct Yellow Rutile Quartz, Round, Transparent

5.19ct Yellow Rutile Quartz, Round, Transparent

11 mm (calibrated)

$ 14.15

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13.23ct Black Nuummite, Oval, Opaque

13.23ct Black Nuummite, Oval, Opaque

18 x 11.4 mm

$ 58.11

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2.26ctw Red Pyrope Garnet, Marquise, VVS-VS

2.26ctw Red Pyrope Garnet, Marquise, VVS-VS

10 x 5 mm

$ 19.81

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24.54ct Multicolor Opal, Pear Shape, Transparent
Opal Product Video (746952)

24.54ct Multicolor Opal, Pear Shape, Transparent

22.5 x 18.4 mm

$ 1,222.09

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2.69ctw Gray Sillimanite Cat'S Eye, Oval, Translucent

2.69ctw Gray Sillimanite Cat'S Eye, Oval, Translucent

7.5 x 5 mm

$ 10.67

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1.15ct Green Tourmaline, Emerald Cut, VVS-VS

1.15ct Green Tourmaline, Emerald Cut, VVS-VS

10.3 x 3.7 mm

$ 28.64

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8.98ct Multicolor Ruby-Zoisite, Baguette, Opaque
Ruby-Zoisite Product Video (636402)

8.98ct Multicolor Ruby-Zoisite, Baguette, Opaque

13.7 x 10.7 mm

$ 21.82

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0.69ctw Yellow Citrine, Oval, VVS-VS

0.69ctw Yellow Citrine, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 4.81

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1.10ct Purple Spinel, Cushion, VS

1.10ct Purple Spinel, Cushion, VS

6.1 x 5.7 mm

$ 184.26

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16.09ct Purple Ruby-Zoisite, Flower Cut, Opaque

16.09ct Purple Ruby-Zoisite, Flower Cut, Opaque

15 x 15 mm (calibrated)

$ 19.55

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0.61ct Orange Clinohumite, Round, SI
Clinohumite Product Video (735122)

0.61ct Orange Clinohumite, Round, SI

5.5 mm (calibrated)

$ 30.38

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10.16ctw Violet Amethyst, Oval, Transparent

10.16ctw Violet Amethyst, Oval, Transparent

12 x 10 mm (calibrated)

$ 55.66

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2.75ctw White Topaz, Cushion, VVS-VS

2.75ctw White Topaz, Cushion, VVS-VS

4.6 x 4.5 mm

$ 15.07

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21.78ctw Multicolor Fossil Coral, Pear Shape, Opaque

21.78ctw Multicolor Fossil Coral, Pear Shape, Opaque

20.9 x 15.2 mm

$ 23.86

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15.05ct Multicolor Jasper, Pear Shape, Opaque

15.05ct Multicolor Jasper, Pear Shape, Opaque

31.3 x 14.2 mm

$ 24.74

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1.57ct Yellow Citrine, Heart, VVS

1.57ct Yellow Citrine, Heart, VVS

8 x 8 mm (calibrated)

$ 9.12

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3.00ct Multicolor Ruby In Fuchsite, Marquise, Translucent

3.00ct Multicolor Ruby In Fuchsite, Marquise, Translucent

18.7 x 7.2 mm

$ 22.15

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17.31ct Multicolor Coral, Oval, Translucent

17.31ct Multicolor Coral, Oval, Translucent

25.3 x 19 mm

$ 53.68

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5.55ct Yellow Rutile Quartz, Round, Transparent

5.55ct Yellow Rutile Quartz, Round, Transparent

11 mm (calibrated)

$ 15.14

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1.09ct Yellow Beryl, Trillion, VVS-VS

1.09ct Yellow Beryl, Trillion, VVS-VS

8 x 8 mm (calibrated)

$ 21.71

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25.64ct Green Jadeite, Oval, Translucent

25.64ct Green Jadeite, Oval, Translucent

22.8 x 17.1 mm

$ 42.14

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1.84ctw Green Peridot, Oval, VS

1.84ctw Green Peridot, Oval, VS

7 x 5 mm (calibrated)

$ 25.66

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2.67ctw Red Pyrope Garnet, Square, VS

2.67ctw Red Pyrope Garnet, Square, VS

4 x 4 mm (calibrated)

$ 20.48

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

The website was very easy to use.

Posted By Garnet in January, 2026
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

I liked the selection of gems, and price. I did not like your PayPal process. I already have a PP account and you want me to sign up for another.

Posted By CLTCJH in May, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Will know more once order received

Posted By Jim in September, 2025
Source: Bizrate

Overall Rating -> 7 star ratings

Easy, quick.

Posted By Mich in June, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Would have bought an indigo and selenite, but neither listed. But, you do offer quite a large assortment otherwise.

Posted By JD in July, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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