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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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6.16ctw Red Almandine Garnet, Round, Transparent

3.2 mm

$ 33.75

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1.43ct Multicolor Opal, Oval, Transparent

10 x 8 mm (calibrated)

$ 65.80

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0.14ctw Black Diamond, Square, Opaque

2.2 x 2.2 mm

$ 69.72

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2.44ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 21.36

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5.43ct Purple Kunzite, Cushion, VVS-VS

13.5 x 7.5 mm

$ 135.21

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2.26ct Orange Hessonite Garnet, Oval, VS-SI

8.8 x 7.3 mm

$ 33.71

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1.60ct Violet Amethyst, Trillion, VVS-VS

8 x 8 mm (calibrated)

$ 10.57

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0.69ct Brown Sphene, Oval, Transparent

5.6 x 4.6 mm

$ 3.44

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2.48ctw Multicolor Andalusite, Round, VS-SI

4 mm (calibrated)

$ 122.27

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1.73ct Green Tourmaline, Oval, VS-SI

8.2 x 6.8 mm

$ 201.03

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1.55ct Green Tourmaline, Cushion, VS

8.5 x 6.1 mm

$ 180.11

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1.04ct Brown Color-Change Garnet, Cushion, VS

6.5 x 4.6 mm

$ 83.08

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1.82ct Green Prehnite, Oval, Transparent/Translucent

7.1 x 6.6 mm

$ 11.63

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4.29ct Brown Tiger'S Eye, Round, Opaque

10 mm (calibrated)

$ 4.27

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34.87ctw Gray Hematite, Emerald Cut, Opaque

20 x 15 mm (calibrated)

$ 34.00

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3.91ct Violet Amethyst, Oval, VS

11.5 x 8.9 mm

$ 31.16

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11.62ct Red Star Garnet, Oval, Opaque

13 x 11 mm (calibrated)

$ 11.45

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3.16ct Violet Amethyst, Oval, Transparent

11 x 9 mm (calibrated)

$ 18.88

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9.01ct Brown Smoky Quartz, Round, VVS

14 mm (calibrated)

$ 10.76

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4.23ct Brown Rutile Quartz, Round, Transparent

12 mm (calibrated)

$ 10.62

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1.34ct Pink Tourmaline, Emerald Cut, VVS-VS

7.1 x 5.5 mm

$ 88.09

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2.08ct Pink Tourmaline, Oval, VS

8.6 x 7.8 mm

$ 241.70

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1.34ct Yellow Citrine, Trillion, VS

7 x 7 mm (calibrated)

$ 8.37

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67.17ct Multicolor Coral, Marquise, Opaque

64.2 x 22.8 mm

$ 98.61

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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

They have a wonderful selection of gems of all sorts, shapes, cuts, and quality. I am very particular about the quality of stones I buy, and found many with VVS clarity and excellent cut and polish. I am thrilled with each of the stones I purchased, and would definitely recommend GemSelect to everyone.

Posted By Debsarabs in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Easy process.

Posted By Crafty Seabee in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I have a beautiful emerald I purchased from a company names gemselect and they are awesome! You should try them out?

Posted By Lynn in September, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly

Posted By Ron T in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Great prices!!! High quality gemstones.

Posted By Ricky in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Great site for finding specific stones and sizes for individual pieces of jewelry

Posted By Designer in December, 2025
Source: Bizrate
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