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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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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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13.13ct Bi-Color Tourmaline, Emerald Cut, SI
Tourmaline Product Video (402789)

13.13ct Bi-Color Tourmaline, Emerald Cut, SI

12.3 x 11.5 mm

$ 1,750.89

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38.17ct Gray Hematite, Round, Opaque

38.17ct Gray Hematite, Round, Opaque

21.6 mm

$ 41.82

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76.12ct Multicolor Jasper, Pear Shape, Translucent
Jasper Product Video (433017)

76.12ct Multicolor Jasper, Pear Shape, Translucent

41.4 x 34.5 mm

$ 60.66

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7.86ct Yellow Cat'S Eye Opal, Oval, Translucent

7.86ct Yellow Cat'S Eye Opal, Oval, Translucent

15 x 10 mm (calibrated)

$ 14.13

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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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1.31ct Yellow Chrysoberyl, Pear Shape, VVS-VS
Chrysoberyl Product Video (366492)

1.31ct Yellow Chrysoberyl, Pear Shape, VVS-VS

9 x 6 mm (calibrated)

$ 152.65

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8.15ct Blue Tourmaline, Fancy, Transparent
Tourmaline Product Video (690455)

8.15ct Blue Tourmaline, Fancy, Transparent

20 x 18.3 mm

$ 238.51

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11.46ct Yellow Apatite, Oval, VS
Apatite Product Video (614758)

11.46ct Yellow Apatite, Oval, VS

16 x 12 mm (calibrated)

$ 520.69

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86.48ct Multicolor Moss Agate, Cushion, Translucent
Moss Agate Product Video (695012)

86.48ct Multicolor Moss Agate, Cushion, Translucent

43.7 x 36.9 mm

$ 68.91

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20.59ct Violet Amethyst, Cushion, VVS
Amethyst Product Video (694477)

20.59ct Violet Amethyst, Cushion, VVS

18 x 18 mm (calibrated)

$ 119.63

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12.19ct Orange Sphalerite, Oval, SI-I1
Sphalerite Product Video (690767)

12.19ct Orange Sphalerite, Oval, SI-I1

14.9 x 11.6 mm

$ 607.06

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2.10ct Orange Sunstone, Round, Translucent

2.10ct Orange Sunstone, Round, Translucent

8.5 mm (calibrated)

$ 12.57

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2.61ctw Gray Sillimanite Cat'S Eye, Oval, Translucent

2.61ctw Gray Sillimanite Cat'S Eye, Oval, Translucent

7.5 x 5.3 mm

$ 8.57

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3.65ct Yellow Cat'S Eye Opal, Oval, Opaque

3.65ct Yellow Cat'S Eye Opal, Oval, Opaque

11.4 x 8.1 mm

$ 15.15

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1.85ct Yellow Diamond, Round, SI
Diamond Product Video (378643)

1.85ct Yellow Diamond, Round, SI

7.5 mm (calibrated)

$ 4,790.76

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0.21ctw White Diamond, Round, VVS-VS
Diamond Product Video (565098)

0.21ctw White Diamond, Round, VVS-VS

3 mm (calibrated)

$ 317.96

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14.98ct Turquoise Grandidierite, Oval, SI-I1
Grandidierite Product Video (568868)

14.98ct Turquoise Grandidierite, Oval, SI-I1

17.5 x 14.6 mm

$ 672.90

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2.48ct Orange Hessonite Garnet, Cushion, SI

2.48ct Orange Hessonite Garnet, Cushion, SI

7 x 7 mm (calibrated)

$ 46.52

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0.24ctw Black Diamond, Round, Opaque

0.24ctw Black Diamond, Round, Opaque

3 mm (calibrated)

$ 114.17

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23.45ctw Multicolor Fossil Coral, Oval, Opaque

23.45ctw Multicolor Fossil Coral, Oval, Opaque

20 x 12.7 mm

$ 29.28

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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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1.25ct Multicolor Opal, Pear Shape, Translucent

1.25ct Multicolor Opal, Pear Shape, Translucent

10 x 8 mm (calibrated)

$ 25.11

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36.94ct White Jadeite, Oval, Translucent

36.94ct White Jadeite, Oval, Translucent

27.9 x 22.3 mm

$ 60.71

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10.80ct Pink Morganite, Pear Shape, Translucent
Morganite Product Video (604848)

10.80ct Pink Morganite, Pear Shape, Translucent

20.1 x 12.7 mm

$ 118.32

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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

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 -> 10 star ratings

It was easy to navigate

Posted By GemGod in July, 2025
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Overall Rating -> 10 star ratings

Filters need to be improved but rest of website is great

Posted By Rock hound in December, 2025
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Overall Rating -> 10 star ratings

Great website, easy to navigate, and loads quickly. Have bought here before, very pleased!

Posted By SallyO in February, 2026
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Overall Rating -> 10 star ratings

It was good. There was a large selection at prices I could afford.

Posted By Zorah in February, 2026
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
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