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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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For Example: 8-9
Bi-color Untreated Gemstones
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5.37ct Violet Amethyst, Pear Shape, VS

5.37ct Violet Amethyst, Pear Shape, VS

15 x 10 mm (calibrated)

$ 41.18

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6.14ct Orange Spessartite Garnet, Cushion, Transparent
Spessartite Garnet Product Video (720091)

6.14ct Orange Spessartite Garnet, Cushion, Transparent

9.5 x 9.4 mm

$ 127.41

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0.51ct Yellow Color-Change Garnet, Square, VVS-VS

0.51ct Yellow Color-Change Garnet, Square, VVS-VS

4.5 x 4.5 mm

$ 52.80

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3.77ct Pink Strawberry Quartz, Round, Translucent

3.77ct Pink Strawberry Quartz, Round, Translucent

10 mm (calibrated)

$ 22.72

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5.35ct Orange Moonstone, Round, Translucent

5.35ct Orange Moonstone, Round, Translucent

10 mm (calibrated)

$ 8.92

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0.77ct Orange Sphalerite, Oval, SI-I1

0.77ct Orange Sphalerite, Oval, SI-I1

5.6 x 5 mm

$ 38.35

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3.06ct Pink Tourmaline, Emerald Cut, SI
Tourmaline Product Video (544792)

3.06ct Pink Tourmaline, Emerald Cut, SI

9 x 6.3 mm

$ 192.77

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1.27ct Orange Hessonite Garnet, Baguette, VS

1.27ct Orange Hessonite Garnet, Baguette, VS

7 x 5 mm (calibrated)

$ 27.83

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26.50ct Brown Tiger'S Eye, Fancy, Opaque

26.50ct Brown Tiger'S Eye, Fancy, Opaque

38.9 x 9.3 mm

$ 7.92

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183.06ct Multicolor Ruby-Zoisite, Oval, Opaque
Ruby-Zoisite Product Video (484087)

183.06ct Multicolor Ruby-Zoisite, Oval, Opaque

55.1 x 41.6 mm

$ 300.84

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1.03ct Orange Hessonite Garnet, Round, VS

1.03ct Orange Hessonite Garnet, Round, VS

6 mm (calibrated)

$ 17.45

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3.04ctw Multicolor Opal, Round, Transparent

3.04ctw Multicolor Opal, Round, Transparent

6.5 mm (calibrated)

$ 70.97

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27.68ct White Howlite, Cushion, Opaque

27.68ct White Howlite, Cushion, Opaque

29 x 18.9 mm

$ 13.24

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1.06ct Orange Hessonite Garnet, Pear Shape, VS-SI

1.06ct Orange Hessonite Garnet, Pear Shape, VS-SI

8.1 x 5.7 mm

$ 23.22

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0.97ct Yellow Color-Change Diaspore, Emerald Cut, VS

0.97ct Yellow Color-Change Diaspore, Emerald Cut, VS

6.3 x 4.6 mm

$ 36.02

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2.69ctw Red Spessartite Garnet, Round, VS

2.69ctw Red Spessartite Garnet, Round, VS

4.2 mm

$ 126.49

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

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

5.8 x 5.2 mm

$ 81.48

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185.63ct Multicolor Agate, Oval, Opaque
Agate Product Video (692421)

185.63ct Multicolor Agate, Oval, Opaque

35.9 x 33.2 mm

$ 92.44

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4.75ct Violet Amethyst, Round, Transparent

4.75ct Violet Amethyst, Round, Transparent

11 mm (calibrated)

$ 33.12

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2.89ct Pink Morganite, Trillion, Transparent

2.89ct Pink Morganite, Trillion, Transparent

9 x 9 mm (calibrated)

$ 26.39

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1.50ct Yellow Diamond, Round, SI
Diamond Product Video (378642)

1.50ct Yellow Diamond, Round, SI

7 mm (calibrated)

$ 4,272.84

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24.65ct Brown Moonstone, Round, Translucent

24.65ct Brown Moonstone, Round, Translucent

18 mm (calibrated)

$ 49.10

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0.96ct Yellow Sphalerite, Oval, SI-I1

0.96ct Yellow Sphalerite, Oval, SI-I1

6 x 5 mm

$ 47.81

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4.30ctw Orange Sunstone, Oval, Transparent

4.30ctw Orange Sunstone, Oval, Transparent

10 x 8 mm (calibrated)

$ 27.48

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

Navigating the site was very easy and the photos of the exact gem you would be purchasing was well done.

Posted By HVeeder in February, 2026
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 -> 9 star ratings

Very good and simple exchange

Posted By Waylon in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Excellent options

Posted By CJ in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

It was good. There was a large selection at prices I could afford.

Posted By Zorah in February, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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