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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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Bi-color Untreated Gemstones
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Multicolor Untreated Gemstones
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Yellow Untreated Gemstones
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0.04ct Black Diamond, Round, Opaque

0.04ct Black Diamond, Round, Opaque

2.2 mm (calibrated)

$ 13.70

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34.49ct White Rainbow Moonstone, Fancy, Opaque

34.49ct White Rainbow Moonstone, Fancy, Opaque

41.2 x 10.4 mm

$ 10.31

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22.38ct White Agate, Oval, Opaque

22.38ct White Agate, Oval, Opaque

25.6 x 15.3 mm

$ 35.44

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47.31ct Yellow Aventurine, Fancy, Opaque

47.31ct Yellow Aventurine, Fancy, Opaque

43 x 12.5 mm

$ 14.13

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2.09ctw Green Prehnite, Oval, Transparent

2.09ctw Green Prehnite, Oval, Transparent

7.4 x 5.3 mm

$ 11.45

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20.07ct Multicolor Jasper, Fancy, Opaque

20.07ct Multicolor Jasper, Fancy, Opaque

31.5 x 8.8 mm

$ 12.09

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4.13ctw Red Pyrope Garnet, Square, VVS-VS

4.13ctw Red Pyrope Garnet, Square, VVS-VS

7 x 7 mm (calibrated)

$ 31.67

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11.80ct Multicolor Agate, Oval, Opaque

11.80ct Multicolor Agate, Oval, Opaque

14.1 x 12.5 mm

$ 19.98

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0.71ct Multicolor Chocolate Opal, Oval, Translucent

0.71ct Multicolor Chocolate Opal, Oval, Translucent

8 x 6 mm (calibrated)

$ 23.34

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33.94ct Multicolor Ruby-Zoisite, Baguette, Opaque
Ruby-Zoisite Product Video (196831)

33.94ct Multicolor Ruby-Zoisite, Baguette, Opaque

24.7 x 16.6 mm

$ 107.83

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18.58ct Pink Rose Quartz, Oval, Transparent

18.58ct Pink Rose Quartz, Oval, Transparent

18 x 13 mm (calibrated)

$ 24.84

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1.56ct Multicolor Opal, Oval, Transparent

1.56ct Multicolor Opal, Oval, Transparent

10.8 x 8.3 mm

$ 68.37

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3.29ctw Orange Sunstone, Oval, Translucent

3.29ctw Orange Sunstone, Oval, Translucent

6.2 x 4.2 mm

$ 25.23

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1.55ct Pink Tourmaline, Oval, Transparent

1.55ct Pink Tourmaline, Oval, Transparent

8 x 6 mm (calibrated)

$ 26.58

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2.37ct Purple Kunzite, Cushion, VS

2.37ct Purple Kunzite, Cushion, VS

7 x 7 mm (calibrated)

$ 65.22

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0.35ctw Black Diamond, Square, Opaque
Diamond Product Video (678053)

0.35ctw Black Diamond, Square, Opaque

2.8 x 2.6 mm

$ 174.30

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1.51ct Brown Diamond, Cushion, SI
Diamond Product Video (382116)

1.51ct Brown Diamond, Cushion, SI

6 x 6 mm (calibrated)

$ 3,526.94

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1.01ct Yellow Citrine, Trillion, VS

1.01ct Yellow Citrine, Trillion, VS

7 x 7 mm (calibrated)

$ 7.75

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1.24ct Pink Morganite, Round, VS-SI

1.24ct Pink Morganite, Round, VS-SI

7.5 mm (calibrated)

$ 95.10

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26.85ct Multicolor Jasper, Oval, Opaque

26.85ct Multicolor Jasper, Oval, Opaque

32.2 x 21.3 mm

$ 22.06

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12.60ct Green Maw-Sit-Sit, Round, Opaque

12.60ct Green Maw-Sit-Sit, Round, Opaque

12 mm (calibrated)

$ 41.42

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2.61ct Violet Amethyst, Marquise, VVS-VS

2.61ct Violet Amethyst, Marquise, VVS-VS

18.2 x 7.1 mm

$ 20.02

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1.39ct Green Tourmaline, Oval, Transparent

1.39ct Green Tourmaline, Oval, Transparent

7.3 x 5.8 mm

$ 23.04

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11.11ct Yellow Citrine, Oval, VVS

11.11ct Yellow Citrine, Oval, VVS

17.1 x 13.3 mm

$ 73.77

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 -> 9 star ratings

It was great!

Posted By Annie in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Easy to use website

Posted By Mel in February, 2026
Source: Bizrate

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

Found a beautiful opal at a great price. I was not disappointed when it arrived. Even better in person.

Posted By Fried Rice in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Gem Select has a user friendly website and the product is very good as is the price. The gems are described accurately and I always get what I think I'm getting.

Posted By Happy Customer in June, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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