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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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2.40ctw Green Prehnite, Oval, Transparent

2.40ctw Green Prehnite, Oval, Transparent

7 x 5.3 mm

$ 26.29

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1.01ctw Orange Citrine, Marquise, VS

1.01ctw Orange Citrine, Marquise, VS

8.1 x 4.3 mm

$ 5.54

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17.96ctw Multicolor Jasper, Pear Shape, Opaque

17.96ctw Multicolor Jasper, Pear Shape, Opaque

19.5 x 14.1 mm

$ 10.20

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23.79ct Multicolor Coral, Pear Shape, Opaque

23.79ct Multicolor Coral, Pear Shape, Opaque

26.1 x 21.9 mm

$ 34.93

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0.74ct Blue Kyanite, Oval, SI-I1

0.74ct Blue Kyanite, Oval, SI-I1

6.4 x 4.2 mm

$ 16.22

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2.27ct Green Peridot, Cushion, VS
Peridot Product Video (437916)

2.27ct Green Peridot, Cushion, VS

8.2 x 7.1 mm

$ 87.05

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4.57ct Pink Morganite, Round, Transparent

4.57ct Pink Morganite, Round, Transparent

10 mm (calibrated)

$ 52.52

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0.27ct Red Spinel, Baguette, VS

0.27ct Red Spinel, Baguette, VS

5.2 x 2.8 mm

$ 22.41

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2.93ct Orange Hessonite Garnet, Oval, VS-SI

2.93ct Orange Hessonite Garnet, Oval, VS-SI

10 x 8 mm (calibrated)

$ 51.71

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9.69ct Red Almandine Garnet, Cushion, VVS-VS
Almandine Garnet Product Video (732456)

9.69ct Red Almandine Garnet, Cushion, VVS-VS

13 x 13 mm (calibrated)

$ 289.54

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5.51ct Yellow Citrine, Oval, VVS

5.51ct Yellow Citrine, Oval, VVS

13.8 x 10.3 mm

$ 36.22

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22.47ct Multicolor Pietersite, Oval, Opaque
Pietersite Product Video (347563)

22.47ct Multicolor Pietersite, Oval, Opaque

30 x 22 mm (calibrated)

$ 98.47

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0.78ct Orange Fire Opal, Oval, Translucent

0.78ct Orange Fire Opal, Oval, Translucent

8 x 6 mm (calibrated)

$ 17.80

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8.52ct Multicolor Coral, Oval, Translucent

8.52ct Multicolor Coral, Oval, Translucent

19.4 x 13.8 mm

$ 26.60

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9.33ct Black Star Diopside, Round, Opaque

9.33ct Black Star Diopside, Round, Opaque

11 mm (calibrated)

$ 46.46

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2.08ct Orange Moonstone, Cushion, Translucent

2.08ct Orange Moonstone, Cushion, Translucent

9 x 7 mm (calibrated)

$ 4.14

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1.10ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

1.10ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

7.3 x 4.8 mm

$ 58.07

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20.89ct Violet Amethyst, Emerald Cut, VVS

20.89ct Violet Amethyst, Emerald Cut, VVS

20 x 15 mm (calibrated)

$ 145.65

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1.07ct Pink Tourmaline, Emerald Cut, VS

1.07ct Pink Tourmaline, Emerald Cut, VS

7.3 x 4.6 mm

$ 80.88

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5.09ct Green Jade, Oval, Opaque

5.09ct Green Jade, Oval, Opaque

12 x 10 mm (calibrated)

$ 10.14

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1.76ct Green Prehnite, Oval, Transparent

1.76ct Green Prehnite, Oval, Transparent

7.8 x 7 mm

$ 13.50

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44.21ct Green Malachite, Oval, Opaque

44.21ct Green Malachite, Oval, Opaque

27.5 x 16.6 mm

$ 33.91

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2.37ct Red Almandine Garnet, Oval, VS

2.37ct Red Almandine Garnet, Oval, VS

9 x 7 mm (calibrated)

$ 88.52

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0.49ct Orange Spessartite Garnet, Oval, VS

0.49ct Orange Spessartite Garnet, Oval, VS

5 x 4 mm (calibrated)

$ 17.08

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 -> 10 star ratings

overall great

Posted By SR in April, 2026
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 -> 10 star ratings

All items were delivered on time with all items meeting or exceeding my expectations. Cut, clarity and color were very close to the photos and description.

Posted By Bob D in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I have shopped at Gemselect for nearly 20 years. I especially like that you see pictures of the exact gem you are purchasing. You are a trusted source.

Posted By DNaber in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I am filling a small treasure chest and picked a nice amethyst.

Posted By VinnyD in August, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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