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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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3.66ctw Multicolor Andalusite, Round, VS

3.66ctw Multicolor Andalusite, Round, VS

3.7 mm

$ 160.75

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1.11ct Green Sphene, Cushion, VS-SI

1.11ct Green Sphene, Cushion, VS-SI

6 x 5.7 mm

$ 66.89

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25.96ct Multicolor Pietersite, Oval, Opaque

25.96ct Multicolor Pietersite, Oval, Opaque

30 x 22 mm (calibrated)

$ 113.76

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4.44ct Multicolor Opal, Pear Shape, Transparent

4.44ct Multicolor Opal, Pear Shape, Transparent

13 x 13 mm (calibrated)

$ 92.13

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6.82ct Blue Larimar, Round, Opaque

6.82ct Blue Larimar, Round, Opaque

12 mm (calibrated)

$ 70.83

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130.91ct Multicolor Rainbow Pyrite, Pear Shape, Opaque
Rainbow Pyrite Product Video (391410)

130.91ct Multicolor Rainbow Pyrite, Pear Shape, Opaque

47 x 43.6 mm

$ 430.27

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2.99ct Brown Cat'S Eye Scapolite, Round, Translucent

2.99ct Brown Cat'S Eye Scapolite, Round, Translucent

9.5 mm (calibrated)

$ 16.38

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24.44ct White Rainbow Moonstone, Marquise, Transparent

24.44ct White Rainbow Moonstone, Marquise, Transparent

29 x 13.7 mm

$ 194.73

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19.68ct Black Obsidian, Oval, Opaque

19.68ct Black Obsidian, Oval, Opaque

31 x 16.8 mm

$ 12.25

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11.34ct Brown Star Moonstone, Round, Translucent

11.34ct Brown Star Moonstone, Round, Translucent

13 mm (calibrated)

$ 37.65

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3.50ctw Orange Hessonite Garnet, Square, VS

3.50ctw Orange Hessonite Garnet, Square, VS

6.7 x 6.6 mm

$ 76.69

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6.30ct Pink Kunzite, Pear Shape, VS

6.30ct Pink Kunzite, Pear Shape, VS

12 x 10 mm (calibrated)

$ 144.48

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34.16ct Multicolor Boulder Opal, Oval, Opaque
Boulder Opal Product Video (410119)

34.16ct Multicolor Boulder Opal, Oval, Opaque

23.4 x 19.6 mm

$ 262.36

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4.14ct Pink Strawberry Quartz, Round, Translucent

4.14ct Pink Strawberry Quartz, Round, Translucent

9 mm (calibrated)

$ 24.86

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45.87ct Green Serpentine, Oval, Translucent

45.87ct Green Serpentine, Oval, Translucent

31.9 x 22 mm

$ 98.22

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37.60ct Multicolor Spectrolite, Cushion, Opaque
Spectrolite Product Video (513071)

37.60ct Multicolor Spectrolite, Cushion, Opaque

45 x 24 mm

$ 134.71

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15.01ct Black Nuummite, Oval, Opaque

15.01ct Black Nuummite, Oval, Opaque

19.7 x 11.5 mm

$ 65.93

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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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0.60ct Green Demantoid Garnet, Oval, VS

0.60ct Green Demantoid Garnet, Oval, VS

6 x 4.2 mm

$ 164.34

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11.84ctw Brown Moonstone, Flower Cut, Translucent

11.84ctw Brown Moonstone, Flower Cut, Translucent

13 x 13 mm (calibrated)

$ 51.89

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97.90ct Red Star Garnet, Oval, Opaque
Star Garnet Product Video (418032)

97.90ct Red Star Garnet, Oval, Opaque

24.7 x 22 mm

$ 536.30

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103.65ct Multicolor Agate, Fancy, Opaque
Agate Product Video (699590)

103.65ct Multicolor Agate, Fancy, Opaque

44.2 x 28 mm

$ 82.59

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0.56ct Yellow Demantoid Garnet, Oval, VVS-VS

0.56ct Yellow Demantoid Garnet, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 153.38

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34.50ct Pink Rose Quartz, Marquise, Transparent
Rose Quartz Product Video (355079)

34.50ct Pink Rose Quartz, Marquise, Transparent

34 x 18.4 mm

$ 75.60

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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

I have purchased stones from gem select in the past and have been very satisfied. I expect to repeat that experience with this purchase as well

Posted By Marti in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

It's always a pleasure doing business with Gem Select. Outstanding products ant very reasonable prices. Thank You One and All.

Posted By G.W. or Bakyow in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very good place to buy gemstones

Posted By Elansary in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.

Posted By Maggie in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Great selection of gems at a reasonable price

Posted By Curt in July, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

They have literally everything on this website! The prices are also pretty good, I was able to find plenty of nice stones that I could afford!

Posted By JC in March, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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