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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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49.22ct Multicolor Tiger'S Eye Matrix, Oval, Opaque

41.4 x 22.8 mm

$ 49.02

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1.02ct Brown Color-Change Garnet, Oval, VVS-VS

6.7 x 5.4 mm

$ 81.48

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0.91ctw Green Tsavorite Garnet, Round, VS

4 mm (calibrated)

$ 146.05

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1.60ct Pink Tourmaline, Round, Transparent

7 mm (calibrated)

$ 27.43

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1.48ctw Green Demantoid Garnet, Round, VVS-VS

3.8 mm

$ 162.15

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6.55ctw Green Prehnite, Pear Shape, Transparent

11.7 x 7.5 mm

$ 35.89

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23.84ctw Multicolor Jasper, Sphere / Ball, Opaque

12 mm (calibrated)

$ 26.11

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47.12ct Black Nuummite, Oval, Opaque

37.9 x 22.2 mm

$ 197.21

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1.74ct Purple Rhodolite Garnet, Oval, VVS

8.3 x 6.5 mm

$ 60.66

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3.04ctw Red Pyrope Garnet, Emerald Cut, VS

5.7 x 3.6 mm

$ 23.31

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1.69ctw Yellow Citrine, Heart, VVS-VS

6 x 6 mm (calibrated)

$ 13.46

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0.84ct Multicolor Labradorite, Round, Translucent

6 mm (calibrated)

$ 2.04

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1.58ctw White Sillimanite Cat'S Eye, Oval, Transparent

6.5 x 4.3 mm

$ 4.99

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21.95ct Multicolor Amethyst Geode Slice, Fancy, Transparent

24.9 x 21.4 mm

$ 23.40

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25.87ctw Green Prehnite, Flower Cut, Transparent

16 x 11.5 mm

$ 39.11

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2.36ct Orange Hessonite Garnet, Oval, VS

9 x 7.5 mm

$ 51.71

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0.72ct Yellow Color-Change Garnet, Emerald Cut, VS

7 x 3.5 mm

$ 78.88

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0.85ctw Multicolor Opal, Oval, Transparent

7 x 5 mm (calibrated)

$ 232.82

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1.03ct Red Rhodolite Garnet, Oval, VS-SI

6.7 x 5.1 mm

$ 27.36

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1.90ct Orange Hessonite Garnet, Round, VS-SI

7.5 mm (calibrated)

$ 26.64

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1.85ct Red Almandine Garnet, Baguette, VVS

9.9 x 5 mm

$ 69.10

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8.22ct Green Prehnite, Fancy, Transparent

18.9 x 11.5 mm

$ 11.44

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1.58ct Orange Hessonite Garnet, Emerald Cut, VVS-VS

7.1 x 5.3 mm

$ 23.50

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1.90ct Orange Zircon, Pear Shape, VS

7.3 x 6.5 mm

$ 52.04

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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

All items were delivered on time with all items meeting or exceeding my expectations. Cut, clarity and color were very close to the photos and description.

Posted By Bob D in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Excellent options

Posted By CJ in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Very large selection from affordable to high end I will be coming back to shop again!

Posted By GreenGator in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

My experience was done with ease

Posted By Barb in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Love beauty, color, quality, and price of these gems. Personal projects and will come here soon and everytime.

Posted By Darkstar in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Always get a nice gemstone. Just like the picture. Never disappointed

Posted By Ron T in June, 2026
Source: Bizrate
Enlarged Gemstone Image