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Untreated Gemstones

Browse our selection of untreated gemstones featuring natural color, clarity and beauty without enhancements.

Untreated Gemstones Weight
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0.92ct Yellow Color-Change Diaspore, Emerald Cut, VS

0.92ct Yellow Color-Change Diaspore, Emerald Cut, VS

5.6 x 5.4 mm

$ 23.52

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3.99ct Yellow Citrine, Oval, VVS

3.99ct Yellow Citrine, Oval, VVS

11 x 9 mm (calibrated)

$ 27.82

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51.87ct Multicolor Ruby-Zoisite, Pear Shape, Opaque
Ruby-Zoisite Product Video (484047)

51.87ct Multicolor Ruby-Zoisite, Pear Shape, Opaque

36.7 x 22.4 mm

$ 85.25

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1.28ct Pink Malaya Garnet, Oval, VS

1.28ct Pink Malaya Garnet, Oval, VS

7 x 5.3 mm

$ 42.07

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263.05ct Pink Star Rose Quartz, Oval, Translucent
Star Rose Quartz Product Video (505880)

263.05ct Pink Star Rose Quartz, Oval, Translucent

39.1 x 35 mm

$ 432.31

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2.51ct Orange Hessonite Garnet, Cushion, VS

2.51ct Orange Hessonite Garnet, Cushion, VS

8 x 6 mm (calibrated)

$ 50.00

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1.93ct Orange Hessonite Garnet, Oval, VS

1.93ct Orange Hessonite Garnet, Oval, VS

8.3 x 6.7 mm

$ 42.29

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6.11ct Black Star Diopside, Oval, Opaque

6.11ct Black Star Diopside, Oval, Opaque

12 x 10 mm (calibrated)

$ 30.43

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50.59ct Multicolor Jasper, Pear Shape, Opaque

50.59ct Multicolor Jasper, Pear Shape, Opaque

32.9 x 26.7 mm

$ 55.43

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3.15ct Pink Morganite, Trillion, Transparent

3.15ct Pink Morganite, Trillion, Transparent

10.4 x 9.7 mm

$ 34.51

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1.68ct Orange Moonstone, Trillion, Translucent

1.68ct Orange Moonstone, Trillion, Translucent

8 x 8 mm (calibrated)

$ 3.34

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1.22ctw Yellow Citrine, Pear Shape, VS

1.22ctw Yellow Citrine, Pear Shape, VS

7 x 5 mm (calibrated)

$ 6.68

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30.25ct Multicolor Jasper, Cushion, Opaque

30.25ct Multicolor Jasper, Cushion, Opaque

25.6 x 23.7 mm

$ 16.58

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4.18ctw Orange Sunstone, Oval, Translucent

4.18ctw Orange Sunstone, Oval, Translucent

7 x 5 mm (calibrated)

$ 32.06

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12.02ctw Violet Amethyst, Oval, Transparent

12.02ctw Violet Amethyst, Oval, Transparent

14 x 10 mm (calibrated)

$ 47.54

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1.12ct Multicolor Opal, Oval, Transparent

1.12ct Multicolor Opal, Oval, Transparent

10 x 7 mm (calibrated)

$ 27.89

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3.11ct Violet Amethyst, Trillion, VVS-VS

3.11ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 21.68

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3.03ct Pink Tourmaline, Emerald Cut, VS-SI
Tourmaline Product Video (545012)

3.03ct Pink Tourmaline, Emerald Cut, VS-SI

10.2 x 6.3 mm

$ 229.06

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1.86ct Brown Hessonite Garnet, Oval, VS-SI

1.86ct Brown Hessonite Garnet, Oval, VS-SI

8.1 x 6.7 mm

$ 33.41

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6.58ct Yellow Rutile Topaz, Pear Shape, Transparent

6.58ct Yellow Rutile Topaz, Pear Shape, Transparent

13.6 x 11.1 mm

$ 136.54

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6.02ctw Multicolor Pietersite, Trillion, Opaque

6.02ctw Multicolor Pietersite, Trillion, Opaque

14 x 12 mm (calibrated)

$ 14.75

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1.02ct Orange Hessonite Garnet, Emerald Cut, VS

1.02ct Orange Hessonite Garnet, Emerald Cut, VS

7 x 5 mm (calibrated)

$ 18.73

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0.76ct Yellow Color-Change Diaspore, Emerald Cut, VS

0.76ct Yellow Color-Change Diaspore, Emerald Cut, VS

6.9 x 4.2 mm

$ 24.98

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3.11ct Multicolor Boulder Opal, Round, Opaque

3.11ct Multicolor Boulder Opal, Round, Opaque

9 mm (calibrated)

$ 12.91

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

Web site is very simple to navigate Selection is terrific

Posted By ToRa.62 in April, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

Site worked well and helped me find a rock that matched what I was looking for. Well within budget and I trust it will show up, so that's definitely positive. Not much else to it. Satisfied.

Posted By Big Ricky in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Love how easy the site is to use. Really love that the pictures are of actual product.

Posted By LeAnn in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.

Posted By Kelly in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

The website was very easy to use.

Posted By Garnet in January, 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
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