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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
Untreated Gemstones Clarity
Untreated Gemstones Price
Untreated Gemstones Treatment

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Multicolor Untreated Gemstones
Orange Untreated Gemstones
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Yellow Untreated Gemstones
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1.40ct Orange Hessonite Garnet, Emerald Cut, VS-SI

1.40ct Orange Hessonite Garnet, Emerald Cut, VS-SI

7 x 5 mm (calibrated)

$ 27.61

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8.81ct Violet Amethyst, Briolette, VS

8.81ct Violet Amethyst, Briolette, VS

16.4 x 9.2 mm

$ 32.17

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3.01ct Red Tourmaline, Oval, Transparent

3.01ct Red Tourmaline, Oval, Transparent

9 x 7 mm (calibrated)

$ 51.59

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6.30ct Multicolor Agate, Oval, Opaque

6.30ct Multicolor Agate, Oval, Opaque

12.9 x 12 mm

$ 10.67

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1.45ct Purple Rhodolite Garnet, Oval, VS

1.45ct Purple Rhodolite Garnet, Oval, VS

7 x 5.9 mm

$ 44.12

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8.87ct Pink Rose Quartz, Emerald Cut, Transparent

8.87ct Pink Rose Quartz, Emerald Cut, Transparent

13 x 13 mm (calibrated)

$ 44.17

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2.03ct Violet Amethyst, Oval, Transparent

2.03ct Violet Amethyst, Oval, Transparent

12.1 x 6.1 mm

$ 14.15

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19.19ctw Black Spinel, Round, Opaque

19.19ctw Black Spinel, Round, Opaque

10 mm (calibrated)

$ 126.14

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23.35ctw Multicolor Coral, Cushion, Translucent

23.35ctw Multicolor Coral, Cushion, Translucent

18.3 x 11.8 mm

$ 44.26

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0.91ct Black Diamond, Round, Opaque
Diamond Product Video (669019)

0.91ct Black Diamond, Round, Opaque

5.8 mm

$ 688.83

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1.18ct Green Tourmaline, Round, Transparent

1.18ct Green Tourmaline, Round, Transparent

6 mm (calibrated)

$ 24.49

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1.41ct Orange Hessonite Garnet, Oval, VS

1.41ct Orange Hessonite Garnet, Oval, VS

7.4 x 6.2 mm

$ 28.09

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1.34ct Brown Kornerupine, Pear Shape, VVS
Kornerupine Product Video (380739)

1.34ct Brown Kornerupine, Pear Shape, VVS

9 x 6 mm (calibrated)

$ 73.41

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6.70ctw Black Spinel, Round, Opaque

6.70ctw Black Spinel, Round, Opaque

9 mm (calibrated)

$ 29.37

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2.79ct Violet Amethyst, Trillion, VVS-VS

2.79ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 22.23

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0.91ct Purple Spinel, Oval, VVS

0.91ct Purple Spinel, Oval, VVS

6.2 x 4.4 mm

$ 75.53

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12.51ct Brown Smoky Quartz, Emerald Cut, VVS

12.51ct Brown Smoky Quartz, Emerald Cut, VVS

14 x 14 mm (calibrated)

$ 24.53

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12.39ctw Multicolor Labradorite, Baguette, Translucent

12.39ctw Multicolor Labradorite, Baguette, Translucent

11 x 9 mm (calibrated)

$ 15.89

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1.18ct Orange Hessonite Garnet, Emerald Cut, VVS-VS

1.18ct Orange Hessonite Garnet, Emerald Cut, VVS-VS

7 x 5 mm (calibrated)

$ 17.55

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4.12ct Multicolor Pietersite, Round, Opaque

4.12ct Multicolor Pietersite, Round, Opaque

12 mm (calibrated)

$ 9.72

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5.10ct Yellow Citrine, Oval, VVS-VS

5.10ct Yellow Citrine, Oval, VVS-VS

13.5 x 9.7 mm

$ 30.63

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2.61ct Green Prehnite, Oval, Transparent

2.61ct Green Prehnite, Oval, Transparent

8.1 x 6.5 mm

$ 8.01

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7.18ct Pink Strawberry Quartz, Oval, Transparent

7.18ct Pink Strawberry Quartz, Oval, Transparent

12 x 10 mm (calibrated)

$ 35.76

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3.64ct Black Star Diopside, Round, Opaque

3.64ct Black Star Diopside, Round, Opaque

9 mm (calibrated)

$ 18.13

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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 -> 8 star ratings

It was fine

Posted By Na in April, 2026
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Overall Rating -> 8 star ratings

It was a good interaction I got a good gemstone for cheap

Posted By Jon in December, 2025
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Overall Rating -> 10 star ratings

Everything was great, website user friendly, quality amazing, communication amazing, delivery amazing, everything was as expected, they done what they said they would, overall experience was amazing.

Posted By Jac in July, 2025
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Overall Rating -> 10 star ratings

This is the first time I have used this site. I was dissatisfied with the quality of gems and supplies elsewhere and decided to try GemSelect. They are awesome! I was thrilled to see the variety and the great web performance. There was the ability to search for information as well as gems. Things like the clarity rating system and caret weight of the gems. I have always loved making things and I have just started to make jewelry as a business. However I have never made a ring before and have always wanted to. On GemSelect I was able to find good quality gems to use in my creations. I am so glad the website is so easy to use. Thank you GemSelect.

Posted By PickyShopper in April, 2026
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

Easy picking, fast checkout, secure shipping. Cana't ask for anything more than efficiency and a good price.

Posted By Beman in September, 2025
Source: Bizrate
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