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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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1.77ct Brown Color-Change Garnet, Pear Shape, VS-SI
Color-Change Garnet Product Video (344767)

1.77ct Brown Color-Change Garnet, Pear Shape, VS-SI

10.5 x 6 mm

$ 158.66

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44.66ct Multicolor Jasper, Trillion, Opaque
Jasper Product Video (470619)

44.66ct Multicolor Jasper, Trillion, Opaque

34.8 x 23.5 mm

$ 35.77

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41.62ct Multicolor Jasper, Pear Shape, Opaque

41.62ct Multicolor Jasper, Pear Shape, Opaque

38.2 x 33.5 mm

$ 45.60

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1.11ct Yellow Sphene, Pear Shape, VS-SI

1.11ct Yellow Sphene, Pear Shape, VS-SI

8 x 5.5 mm

$ 36.49

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1.67ct Green Tourmaline, Fancy, VVS
Tourmaline Product Video (715332)

1.67ct Green Tourmaline, Fancy, VVS

7.8 x 5.7 mm

$ 199.60

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28.17ct Orange Moonstone, Oval, Opaque

28.17ct Orange Moonstone, Oval, Opaque

22.2 x 16.2 mm

$ 56.12

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1.14ct Pink Morganite, Pear Shape, VVS-VS
Morganite Product Video (478160)

1.14ct Pink Morganite, Pear Shape, VVS-VS

9.9 x 6.2 mm

$ 104.08

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1.50ct Orange Sphalerite, Round, SI-I1
Sphalerite Product Video (691695)

1.50ct Orange Sphalerite, Round, SI-I1

6.5 mm (calibrated)

$ 62.25

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87.19ct Pink Rose Quartz, Trillion, Transparent
Rose Quartz Product Video (521008)

87.19ct Pink Rose Quartz, Trillion, Transparent

32.9 x 27.6 mm

$ 159.21

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11.78ctw Multicolor Tourmaline, Fancy, Transparent
Tourmaline Product Video (690541)

11.78ctw Multicolor Tourmaline, Fancy, Transparent

20.1 x 9.5 mm

$ 229.61

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0.73ct Yellow Color-Change Garnet, Emerald Cut, VS

0.73ct Yellow Color-Change Garnet, Emerald Cut, VS

7.1 x 3.5 mm

$ 79.98

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1.82ct White Sillimanite Cat'S Eye, Oval, Transparent

1.82ct White Sillimanite Cat'S Eye, Oval, Transparent

8 x 6 mm (calibrated)

$ 5.98

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14.22ct Brown Smoky Quartz, Emerald Cut, VVS

14.22ct Brown Smoky Quartz, Emerald Cut, VVS

16 x 16 mm (calibrated)

$ 38.95

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9.88ct Multicolor Ruby-Zoisite, Baguette, Opaque

9.88ct Multicolor Ruby-Zoisite, Baguette, Opaque

18.1 x 10 mm

$ 24.01

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1.89ct Green Sphene, Pear Shape, VS
Sphene Product Video (381632)

1.89ct Green Sphene, Pear Shape, VS

9.5 x 6.9 mm

$ 155.76

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20.92ct Multicolor Quartz With Hedenbergite, Oval, Transparent
Quartz With Hedenbergite Product Video (604641)

20.92ct Multicolor Quartz With Hedenbergite, Oval, Transparent

22.1 x 16 mm

$ 85.95

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54.13ct Pink Rose Quartz, Oval, Transparent/Translucent

54.13ct Pink Rose Quartz, Oval, Transparent/Translucent

25.8 x 22 mm

$ 77.10

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2.31ct Multicolor Spectrolite, Round, Opaque

2.31ct Multicolor Spectrolite, Round, Opaque

10 mm (calibrated)

$ 9.07

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5.89ct Brown Cat'S Eye Opal, Oval, Translucent

5.89ct Brown Cat'S Eye Opal, Oval, Translucent

13.7 x 10.5 mm

$ 32.27

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18.08ctw Green Aventurine, Pear Shape, Translucent

18.08ctw Green Aventurine, Pear Shape, Translucent

20.7 x 14.4 mm

$ 41.80

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20.80ct Multicolor Boulder Opal, Fancy, Opaque
Boulder Opal Product Video (522410)

20.80ct Multicolor Boulder Opal, Fancy, Opaque

32.3 x 16.8 mm

$ 113.94

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12.84ct Green Tsavorite Garnet, Pear Shape, Translucent
Tsavorite Garnet Product Video (521325)

12.84ct Green Tsavorite Garnet, Pear Shape, Translucent

22.1 x 11.3 mm

$ 281.35

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110.64ct Orange Druzy Citrine, Oval, Opaque
Druzy Citrine Product Video (690246)

110.64ct Orange Druzy Citrine, Oval, Opaque

39.1 x 31.4 mm

$ 53.95

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9.93ct White Rainbow Moonstone, Pear Shape, Transparent

9.93ct White Rainbow Moonstone, Pear Shape, Transparent

16.2 x 12.6 mm

$ 178.03

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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 -> 9 star ratings

Plan on purchasing on an ongoing basis. So far.....so good....

Posted By Jim in January, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

I've purchased things from GemSelect before. What you see is what you get, which is not always the case with gem sites online. You can find some good value with gem select, and I will buy from them again.

Posted By Meyeusername in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I had a very easy time navigating the web page and using filters to find what I was looking for. The varied selection was nice to see and pricing is clear and fair.

Posted By Mattick in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Took a chance on purchasing my gemstones from Gemselect and was impressed. 10/10

Posted By KT in September, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

The purchasing process is fairly quick and straightforward and for me user friendly so it probably took more or less than 3 minutes to purchase and pay for the items. I wish there was a discount offer for multiple items to encourage us buyers to purchase more an incentive and add more sales in your end. Besides that, it's been a great purchasing experience and will continue to shop as I am a repeat customer and have bought from your store many times before. Thank you.

Posted By Emmanuel in October, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

It was fine . Wish there had been more round stones to select from

Posted By Emm in January, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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