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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
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Untreated Gemstones Treatment

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Bi-color Untreated Gemstones
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Yellow Untreated Gemstones
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84.37ct Multicolor Jasper, Cushion, Opaque

84.37ct Multicolor Jasper, Cushion, Opaque

38.4 x 38 mm

$ 51.78

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0.53ct Yellow Color-Change Diaspore, Oval, VVS-VS

0.53ct Yellow Color-Change Diaspore, Oval, VVS-VS

6.6 x 3.8 mm

$ 19.62

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2.85ct Red Rhodolite Garnet, Oval, VS

2.85ct Red Rhodolite Garnet, Oval, VS

9.1 x 8.2 mm

$ 76.41

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7.01ct Brown Smoky Quartz, Round, VVS-VS

7.01ct Brown Smoky Quartz, Round, VVS-VS

13 mm (calibrated)

$ 23.04

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5.65ctw Violet Amethyst, Oval, Transparent

5.65ctw Violet Amethyst, Oval, Transparent

10 x 8 mm (calibrated)

$ 30.96

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0.91ct Yellow Citrine, Oval, Transparent

0.91ct Yellow Citrine, Oval, Transparent

10.2 x 4.2 mm

$ 5.29

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5.05ctw Multicolor Pietersite, Round, Opaque

5.05ctw Multicolor Pietersite, Round, Opaque

11 mm (calibrated)

$ 11.82

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0.85ct Orange Hessonite Garnet, Cushion, SI

0.85ct Orange Hessonite Garnet, Cushion, SI

5 x 5 mm (calibrated)

$ 16.77

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1.02ct Multicolor Opal, Oval, Translucent

1.02ct Multicolor Opal, Oval, Translucent

8.6 x 6.8 mm

$ 32.08

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11.97ct Multicolor Jasper, Fancy, Opaque

11.97ct Multicolor Jasper, Fancy, Opaque

22.3 x 12.9 mm

$ 19.68

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2.20ctw Red Pyrope Garnet, Marquise, VVS-VS

2.20ctw Red Pyrope Garnet, Marquise, VVS-VS

9.9 x 5.1 mm

$ 19.28

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0.70ct Green Peridot, Oval, VS

0.70ct Green Peridot, Oval, VS

7 x 5 mm (calibrated)

$ 9.76

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10.56ctw Green Prehnite, Fancy, Translucent

10.56ctw Green Prehnite, Fancy, Translucent

15.2 x 10.9 mm

$ 17.35

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1.25ct Gray Cat'S Eye Alexandrite, Oval, Opaque

1.25ct Gray Cat'S Eye Alexandrite, Oval, Opaque

6.7 x 4.2 mm

$ 259.38

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10.11ct Red Strawberry Quartz, Oval, Translucent

10.11ct Red Strawberry Quartz, Oval, Translucent

15.8 x 13 mm

$ 77.54

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14.01ct Multicolor Agate, Round, Opaque

14.01ct Multicolor Agate, Round, Opaque

17 mm (calibrated)

$ 23.72

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2.18ctw Yellow Citrine, Square, VVS-VS

2.18ctw Yellow Citrine, Square, VVS-VS

6 x 6 mm (calibrated)

$ 16.72

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2.23ct Orange Hessonite Garnet, Cushion, VS-SI

2.23ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 43.97

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12.85ct White Rainbow Moonstone, Fancy, Transparent

12.85ct White Rainbow Moonstone, Fancy, Transparent

22.6 x 10 mm

$ 102.39

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3.27ct Multicolor Opal, Cushion, Transparent

3.27ct Multicolor Opal, Cushion, Transparent

15.7 x 7.3 mm

$ 82.20

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0.86ct Orange Hessonite Garnet, Cushion, SI

0.86ct Orange Hessonite Garnet, Cushion, SI

5 x 5 mm (calibrated)

$ 16.97

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3.82ctw Violet Amethyst, Oval, VVS-VS

3.82ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 20.92

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0.84ct Yellow Morganite, Pear Shape, VVS-VS

0.84ct Yellow Morganite, Pear Shape, VVS-VS

8 x 6 mm (calibrated)

$ 36.81

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0.36ct Orange Spessartite Garnet, Oval, VS

0.36ct Orange Spessartite Garnet, Oval, VS

5.1 x 3.2 mm

$ 12.55

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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

Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly

Posted By Ron T in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I always purchase my stones from GemSelect, their products are high quality and customer service is always great. I also like the fact that I am able to purchase unique items

Posted By Desperaux in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Love beauty, color, quality, and price of these gems. Personal projects and will come here soon and everytime.

Posted By Darkstar in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

My current project is something BLUE . Opal earrings with matching tennis bracelet for her wedding. The opals and sixty two sapphires VVS & VS are AMAZINGLY BEAUTIFUL. The private jewelers were impressed by the clarity and inclusion free of the sapphires . I want to say thank you for the High quality sapphires that I purchased for my daughtera's wedding.

Posted By My real name Dean or Wandering about in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

They have a wonderful selection of gems of all sorts, shapes, cuts, and quality. I am very particular about the quality of stones I buy, and found many with VVS clarity and excellent cut and polish. I am thrilled with each of the stones I purchased, and would definitely recommend GemSelect to everyone.

Posted By Debsarabs in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Love, and have always loved, your website.

Posted By Aberabic in July, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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