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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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Untreated Gemstones Treatment

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Bi-color Untreated Gemstones
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Multicolor Untreated Gemstones
Orange Untreated Gemstones
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Yellow Untreated Gemstones
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43.52ct Blue Turquoise, Oval, Opaque

43.52ct Blue Turquoise, Oval, Opaque

29.7 x 20.1 mm

$ 130.04

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10.65ct Multicolor Boulder Opal, Fancy, Opaque

10.65ct Multicolor Boulder Opal, Fancy, Opaque

20.2 x 13.2 mm

$ 53.04

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0.89ct Green Tourmaline, Emerald Cut, VS

0.89ct Green Tourmaline, Emerald Cut, VS

11.9 x 3 mm

$ 23.41

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0.66ct Multicolor Opal, Pear Shape, Transparent

0.66ct Multicolor Opal, Pear Shape, Transparent

7.9 x 5.7 mm

$ 16.43

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4.37ctw Pink Strawberry Quartz, Oval, Transparent

4.37ctw Pink Strawberry Quartz, Oval, Transparent

10 x 8 mm (calibrated)

$ 32.47

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5.58ct White Dendritic Agate, Pear Shape, Opaque

5.58ct White Dendritic Agate, Pear Shape, Opaque

14 x 10 mm (calibrated)

$ 4.44

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11.11ct Multicolor Agate, Fancy, Opaque

11.11ct Multicolor Agate, Fancy, Opaque

17.9 x 7.8 mm

$ 19.46

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0.85ctw Yellow Citrine, Oval, VS

0.85ctw Yellow Citrine, Oval, VS

6 x 4 mm (calibrated)

$ 5.59

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3.67ct Green Prehnite, Oval, Transparent/Translucent

3.67ct Green Prehnite, Oval, Transparent/Translucent

10 x 8 mm (calibrated)

$ 10.06

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4.88ct Multicolor Tourmaline, Fancy, Transparent

4.88ct Multicolor Tourmaline, Fancy, Transparent

12.8 x 11.2 mm

$ 121.51

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3.45ctw Yellow Citrine, Oval, VVS-VS

3.45ctw Yellow Citrine, Oval, VVS-VS

9 x 7 mm (calibrated)

$ 26.46

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26.43ct Brown Jasper, Fancy, Opaque

26.43ct Brown Jasper, Fancy, Opaque

37.3 x 9.6 mm

$ 5.27

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1.13ct Orange Hessonite Garnet, Pear Shape, SI

1.13ct Orange Hessonite Garnet, Pear Shape, SI

8 x 6 mm (calibrated)

$ 24.76

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17.51ct Violet Amethyst, Cushion, VS

17.51ct Violet Amethyst, Cushion, VS

20 x 15 mm (calibrated)

$ 122.08

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5.40ct Yellow Rutile Quartz, Round, Transparent

5.40ct Yellow Rutile Quartz, Round, Transparent

11 mm (calibrated)

$ 14.74

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11.91ct Multicolor Ruby-Zoisite, Marquise, Opaque
Ruby-Zoisite Product Video (291479)

11.91ct Multicolor Ruby-Zoisite, Marquise, Opaque

23.8 x 10 mm

$ 35.89

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5.09ctw Violet Amethyst, Fancy, VS
Amethyst Product Video (372718)

5.09ctw Violet Amethyst, Fancy, VS

9 x 4.6 mm

$ 33.46

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5.98ct Multicolor Labradorite, Pear Shape, Translucent

5.98ct Multicolor Labradorite, Pear Shape, Translucent

14 x 10 mm (calibrated)

$ 13.23

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29.35ct Multicolor Jasper, Fancy, Opaque

29.35ct Multicolor Jasper, Fancy, Opaque

37.3 x 17.1 mm

$ 22.51

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6.47ct Violet Amethyst, Pear Shape, VS

6.47ct Violet Amethyst, Pear Shape, VS

16 x 12 mm (calibrated)

$ 49.62

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5.90ct White Rainbow Moonstone, Baguette, Transparent

5.90ct White Rainbow Moonstone, Baguette, Transparent

15.6 x 7.2 mm

$ 47.01

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4.75ct Pink Strawberry Quartz, Oval, Translucent

4.75ct Pink Strawberry Quartz, Oval, Translucent

14 x 10 mm (calibrated)

$ 28.63

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1.79ctw Green Demantoid Garnet, Oval, VS-SI

1.79ctw Green Demantoid Garnet, Oval, VS-SI

5 x 4 mm (calibrated)

$ 196.11

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1.61ct Orange Fire Opal, Oval, Transparent
Fire Opal Product Video (674144)

1.61ct Orange Fire Opal, Oval, Transparent

10.4 x 7.5 mm

$ 56.12

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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

Very pleasant

Posted By Varun in June, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.

Posted By G.W. in June, 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

Easy to conduct search, good amount of stock to select from along with variety of prices.

Posted By Que in June, 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

Had a great experience and the prices are great

Posted By BuBx99 in November, 2025
Source: Bizrate
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