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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
Untreated Gemstones Clarity
Untreated Gemstones Price
Untreated Gemstones Treatment

Size Explained

Choose Size or Size Range
For Example: 6-7
For Example: 8-9
Bi-color Untreated Gemstones
Black Untreated Gemstones
Blue Untreated Gemstones
Brown Untreated Gemstones
Golden Untreated Gemstones
Gray Untreated Gemstones
Green Untreated Gemstones
Multicolor Untreated Gemstones
Orange Untreated Gemstones
Pink Untreated Gemstones
Purple Untreated Gemstones
Red Untreated Gemstones
Turquoise Untreated Gemstones
Violet Untreated Gemstones
White Untreated Gemstones
Yellow Untreated Gemstones
Single
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Lots
Faceted
Cabochons
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3.75ct Multicolor Ruby In Fuchsite, Marquise, Translucent

3.75ct Multicolor Ruby In Fuchsite, Marquise, Translucent

19.8 x 9.2 mm

$ 28.05

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2.38ct Green Peridot, Cushion, VS

2.38ct Green Peridot, Cushion, VS

9.5 x 7 mm

$ 93.87

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205.80ct Multicolor Jasper, Round, Opaque
Jasper Product Video (346704)

205.80ct Multicolor Jasper, Round, Opaque

55.7 mm

$ 153.73

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123.42ct Yellow Obsidian, Oval, Opaque
Obsidian Product Video (447905)

123.42ct Yellow Obsidian, Oval, Opaque

65.1 x 33.1 mm

$ 135.22

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14.25ct Violet Charoite, Pear Shape, Opaque

14.25ct Violet Charoite, Pear Shape, Opaque

21.8 x 16.2 mm

$ 48.69

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2.56ct Pink Malaya Garnet, Round, VS

2.56ct Pink Malaya Garnet, Round, VS

8 mm (calibrated)

$ 99.33

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7.84ct Brown Smoky Quartz, Emerald Cut, VVS

7.84ct Brown Smoky Quartz, Emerald Cut, VVS

14 x 14 mm (calibrated)

$ 32.90

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6.02ct Brown Smoky Quartz, Flower Cut, Transparent

6.02ct Brown Smoky Quartz, Flower Cut, Transparent

14.1 x 10 mm

$ 22.36

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17.43ct Brown Smoky Quartz, Round, VVS
Smoky Quartz Product Video (503802)

17.43ct Brown Smoky Quartz, Round, VVS

18 mm (calibrated)

$ 57.29

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7.99ct Bi-Color Tourmaline, Emerald Cut, SI
Tourmaline Product Video (696778)

7.99ct Bi-Color Tourmaline, Emerald Cut, SI

18.2 x 7.7 mm

$ 530.54

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20.10ct Multicolor Boulder Opal, Cushion, Opaque

20.10ct Multicolor Boulder Opal, Cushion, Opaque

21.1 x 16.6 mm

$ 100.10

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1.72ct Blue Kyanite, Round, SI-I1
Kyanite Product Video (602718)

1.72ct Blue Kyanite, Round, SI-I1

7 mm (calibrated)

$ 47.11

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2.70ct Pink Tourmaline, Emerald Cut, VS-SI

2.70ct Pink Tourmaline, Emerald Cut, VS-SI

9.4 x 6.1 mm

$ 170.09

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6.84ct Green Actinolite Cat'S Eye, Oval, Translucent
Actinolite Cat's Eye Product Video (486225)

6.84ct Green Actinolite Cat'S Eye, Oval, Translucent

14 x 10 mm (calibrated)

$ 47.69

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55.03ct Pink Rose Quartz, Trillion, Transparent

55.03ct Pink Rose Quartz, Trillion, Transparent

29.2 x 24.5 mm

$ 98.89

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2.29ct Orange Hessonite Garnet, Cushion, VS-SI

2.29ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 42.94

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4.97ct Green Sphene, Pear Shape, VS-SI
Sphene Product Video (380599)

4.97ct Green Sphene, Pear Shape, VS-SI

11.3 x 9.7 mm

$ 534.76

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9.91ctw White Quartz Cat'S Eye, Round, Transparent

9.91ctw White Quartz Cat'S Eye, Round, Transparent

10 mm (calibrated)

$ 35.29

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5.38ctw Orange Hessonite Garnet, Cushion, VS-SI

5.38ctw Orange Hessonite Garnet, Cushion, VS-SI

9 x 7 mm (calibrated)

$ 89.31

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25.97ct White Rainbow Moonstone, Oval, Translucent
Rainbow Moonstone Product Video (674102)

25.97ct White Rainbow Moonstone, Oval, Translucent

24.1 x 17.2 mm

$ 323.33

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33.92ct Green Maw-Sit-Sit, Oval, Opaque

33.92ct Green Maw-Sit-Sit, Oval, Opaque

23 x 15.9 mm

$ 101.35

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9.86ct Multicolor Fire Agate, Fancy, Opaque

9.86ct Multicolor Fire Agate, Fancy, Opaque

16.9 x 12.3 mm

$ 77.35

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6.48ct Green Idocrase, Pear Shape, VS
Idocrase Product Video (502119)

6.48ct Green Idocrase, Pear Shape, VS

12.9 x 9.9 mm

$ 606.12

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1.05ct Violet Spinel, Pear Shape, VS
Spinel Product Video (402831)

1.05ct Violet Spinel, Pear Shape, VS

7.4 x 5.8 mm

$ 175.13

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

Great experience. I can't wait to explore on the website further.

Posted By Kymmie in September, 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

Overall Rating -> 9 star ratings

Fast snd easy to find what I was looking for

Posted By Bawb in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Although the stones are smaller than I thought, I really don't think in millimeters, they are perfect. I plan to put one into a ring and the other into a necklace. Ordering was easy, contact kept me aware of how shipping was going, and delivery was sooner than expected. The quality of stones I have ordered in the past and this recent order is outstanding and stones I will be proud to wear.

Posted By Ktreva52 in June, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Easy process.

Posted By Crafty Seabee in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Great selection. Maybe too great i kept adding and deleting stuff because i found better looking ones

Posted By Edsor works in October, 2025
Source: Bizrate
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