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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
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1.09ct Blue Kyanite, Round, SI

1.09ct Blue Kyanite, Round, SI

6 mm (calibrated)

$ 27.14

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3.14ctw Orange Moonstone, Trillion, Translucent

3.14ctw Orange Moonstone, Trillion, Translucent

8 x 8 mm (calibrated)

$ 6.26

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1.80ct Green Tourmaline, Cushion, VS
Tourmaline Product Video (747724)

1.80ct Green Tourmaline, Cushion, VS

8.7 x 5.6 mm

$ 209.16

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10.81ctw White Dendritic Agate, Pear Shape, Opaque

10.81ctw White Dendritic Agate, Pear Shape, Opaque

14 x 10 mm (calibrated)

$ 8.62

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0.78ct Yellow Color-Change Diaspore, Cushion, VS

0.78ct Yellow Color-Change Diaspore, Cushion, VS

6.2 x 5 mm

$ 29.91

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82.49ct Violet Amethyst, Oval, VVS
Amethyst Product Video (638590)

82.49ct Violet Amethyst, Oval, VVS

31.8 x 26.6 mm

$ 575.12

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2.13ct Orange Hessonite Garnet, Cushion, VS-SI

2.13ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 34.51

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0.78ct Orange Sphalerite, Oval, VS-SI

0.78ct Orange Sphalerite, Oval, VS-SI

5.7 x 4.9 mm

$ 38.84

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1.81ct Brown Diamond, Pear Shape, VS
Diamond Product Video (460449)

1.81ct Brown Diamond, Pear Shape, VS

8.8 x 6.6 mm

$ 3,331.50

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2.15ct Pink Kunzite, Emerald Cut, VVS

2.15ct Pink Kunzite, Emerald Cut, VVS

7 x 6.1 mm

$ 53.54

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1.81ct Brown Color-Change Garnet, Pear Shape, VS
Color-Change Garnet Product Video (720472)

1.81ct Brown Color-Change Garnet, Pear Shape, VS

9 x 6 mm (calibrated)

$ 144.60

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1.99ct Orange Hessonite Garnet, Oval, VS-SI

1.99ct Orange Hessonite Garnet, Oval, VS-SI

8.5 x 7 mm

$ 34.42

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9.18ct Yellow Rutile Quartz, Pear Shape, Transparent

9.18ct Yellow Rutile Quartz, Pear Shape, Transparent

16 x 12 mm (calibrated)

$ 24.95

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2.69ct Violet Amethyst, Trillion, VS

2.69ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 18.76

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0.43ct Yellow Spessartite Garnet, Oval, VS

0.43ct Yellow Spessartite Garnet, Oval, VS

5 x 4 mm (calibrated)

$ 12.85

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1.10ct Green Peridot, Oval, VVS-VS

1.10ct Green Peridot, Oval, VVS-VS

8 x 6 mm (calibrated)

$ 9.86

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1.22ct White Rainbow Moonstone, Oval, Transparent

1.22ct White Rainbow Moonstone, Oval, Transparent

8 x 6 mm (calibrated)

$ 20.77

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0.50ct Orange Citrine, Trillion, VS-SI

0.50ct Orange Citrine, Trillion, VS-SI

6 x 6 mm (calibrated)

$ 4.15

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2.34ct Green Chrysoprase, Pear Shape, Opaque

2.34ct Green Chrysoprase, Pear Shape, Opaque

11.3 x 7.4 mm

$ 29.13

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90.69ct Green Moss Agate, Square, Opaque

90.69ct Green Moss Agate, Square, Opaque

27.6 x 26.8 mm

$ 75.27

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2.04ct Orange Moonstone, Trillion, Translucent

2.04ct Orange Moonstone, Trillion, Translucent

8 x 8 mm (calibrated)

$ 4.07

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2.06ct Green Peridot, Cushion, VS

2.06ct Green Peridot, Cushion, VS

8.5 x 6.7 mm

$ 71.81

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2.77ct Orange Moonstone, Marquise, Translucent

2.77ct Orange Moonstone, Marquise, Translucent

14 x 7 mm (calibrated)

$ 5.52

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1.13ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

1.13ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

6.2 x 4.6 mm

$ 50.80

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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

I've purchased things from GemSelect before. What you see is what you get, which is not always the case with gem sites online. You can find some good value with gem select, and I will buy from them again.

Posted By Meyeusername in March, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

First time using this website. It was both exciting finding things in my price range and things Iam gonna save up for and use in other pieces. I love that the picture of the gem is the exact gem I'll be buying. I haven't tested the gems yes but they said they sold me 100% natural gems.

Posted By Salvo in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The site provided lots of detail, factual data, and good photos. I also like the availability of searching by price range as well as by the type of stone.

Posted By SLIntuitive Donna in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very food

Posted By Keeto in July, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

I loved the selection of gemstones you have a to z

Posted By James in May, 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
→ View All GemSelect Reviews on Bizrate
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