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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
Untreated Gemstones Clarity
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Untreated Gemstones Treatment

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3.11ct Yellow Citrine, Oval, VVS-VS

3.11ct Yellow Citrine, Oval, VVS-VS

11 x 9 mm (calibrated)

$ 21.68

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17.12ct Black Nuummite, Oval, Opaque

17.12ct Black Nuummite, Oval, Opaque

21.5 x 14.1 mm

$ 70.25

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1.02ct Yellow Citrine, Trillion, VVS-VS

1.02ct Yellow Citrine, Trillion, VVS-VS

7 x 7 mm (calibrated)

$ 6.71

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5.07ctw Green Peridot, Oval, VS

5.07ctw Green Peridot, Oval, VS

8 x 6 mm (calibrated)

$ 55.54

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1.23ct Yellow Color-Change Diaspore, Cushion, VVS

1.23ct Yellow Color-Change Diaspore, Cushion, VVS

7 x 6.1 mm

$ 64.93

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13.65ct Brown Tiger'S Eye, Baguette, Opaque

13.65ct Brown Tiger'S Eye, Baguette, Opaque

18 x 13 mm (calibrated)

$ 13.60

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1.12ct Green Sphene, Oval, SI

1.12ct Green Sphene, Oval, SI

7.5 x 5.3 mm

$ 46.02

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2.77ct Red Pyrope Garnet, Fancy, Transparent

2.77ct Red Pyrope Garnet, Fancy, Transparent

10.6 x 8.4 mm

$ 6.07

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0.91ct Yellow Color-Change Diaspore, Cushion, VS

0.91ct Yellow Color-Change Diaspore, Cushion, VS

6.3 x 5.6 mm

$ 29.91

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17.49ct Blue Chalcedony, Cushion, Opaque

17.49ct Blue Chalcedony, Cushion, Opaque

22.7 x 15.5 mm

$ 43.56

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3.52ctw Red Pyrope Garnet, Square, VS

3.52ctw Red Pyrope Garnet, Square, VS

4 x 4 mm (calibrated)

$ 26.99

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19.77ct Brown Moonstone, Oval, Opaque

19.77ct Brown Moonstone, Oval, Opaque

22.1 x 15.9 mm

$ 43.32

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25.04ct Multicolor Jasper, Oval, Opaque

25.04ct Multicolor Jasper, Oval, Opaque

25.5 x 20.4 mm

$ 15.64

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3.95ctw Red Almandine Garnet, Oval, VVS-VS
Almandine Garnet Product Video (736770)

3.95ctw Red Almandine Garnet, Oval, VVS-VS

9 x 7 mm (calibrated)

$ 147.53

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0.91ct Blue Kyanite, Oval, SI

0.91ct Blue Kyanite, Oval, SI

7 x 5 mm (calibrated)

$ 22.66

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9.18ct Multicolor Boulder Opal, Cushion, Opaque

9.18ct Multicolor Boulder Opal, Cushion, Opaque

16.7 x 9.6 mm

$ 45.72

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1.52ct White Rainbow Moonstone, Oval, Transparent

1.52ct White Rainbow Moonstone, Oval, Transparent

8 x 6 mm (calibrated)

$ 25.88

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1.92ct Orange Hessonite Garnet, Cushion, VS-SI

1.92ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 28.60

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2.93ct Violet Amethyst, Trillion, VVS-VS

2.93ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 20.43

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1.84ctw Orange Spessartite Garnet, Round, VS

1.84ctw Orange Spessartite Garnet, Round, VS

4.3 mm

$ 60.47

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2.86ct Violet Amethyst, Trillion, VVS-VS

2.86ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 22.79

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11.72ct Black Tourmaline, Cushion, Opaque

11.72ct Black Tourmaline, Cushion, Opaque

16 x 12 mm (calibrated)

$ 58.37

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5.06ctw White Topaz, Square, VS

5.06ctw White Topaz, Square, VS

4.2 x 4.1 mm

$ 38.80

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47.87ct Violet Amethyst, Oval, IF
Amethyst Product Video (506053)

47.87ct Violet Amethyst, Oval, IF

22.3 x 19.3 mm

$ 314.68

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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

Easy picking, fast checkout, secure shipping. Cana't ask for anything more than efficiency and a good price.

Posted By Beman in September, 2025
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

It was easy to navigate

Posted By GemGod in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

the selection is good as are the prices

Posted By Old man in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I always purchase my stones from GemSelect, their products are high quality and customer service is always great. I also like the fact that I am able to purchase unique items

Posted By Desperaux in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

This is the first time I have used this site. I was dissatisfied with the quality of gems and supplies elsewhere and decided to try GemSelect. They are awesome! I was thrilled to see the variety and the great web performance. There was the ability to search for information as well as gems. Things like the clarity rating system and caret weight of the gems. I have always loved making things and I have just started to make jewelry as a business. However I have never made a ring before and have always wanted to. On GemSelect I was able to find good quality gems to use in my creations. I am so glad the website is so easy to use. Thank you GemSelect.

Posted By PickyShopper in April, 2026
Source: Bizrate
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