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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
Untreated Gemstones Clarity
Untreated Gemstones Price
Untreated Gemstones Treatment

Size Explained

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For Example: 8-9
Bi-color Untreated Gemstones
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Orange Untreated Gemstones
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Yellow Untreated Gemstones
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0.94ct Yellow Sphalerite, Oval, SI

0.94ct Yellow Sphalerite, Oval, SI

5.7 x 4.7 mm

$ 46.81

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2.36ct Orange Hessonite Garnet, Oval, VS

2.36ct Orange Hessonite Garnet, Oval, VS

9 x 7.5 mm

$ 51.71

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13.53ct Violet Amethyst, Round, VVS

13.53ct Violet Amethyst, Round, VVS

16 mm (calibrated)

$ 94.33

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9.73ct Multicolor Boulder Opal, Fancy, Opaque

9.73ct Multicolor Boulder Opal, Fancy, Opaque

16 x 12 mm (calibrated)

$ 48.46

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13.97ct Multicolor Pietersite, Baguette, Opaque

13.97ct Multicolor Pietersite, Baguette, Opaque

20.4 x 12.3 mm

$ 34.23

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1.47ctw Yellow Citrine, Heart, VVS-VS

1.47ctw Yellow Citrine, Heart, VVS-VS

6 x 6 mm (calibrated)

$ 11.71

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6.24ctw White Moonstone, Round, Translucent

6.24ctw White Moonstone, Round, Translucent

9 mm (calibrated)

$ 17.09

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105.35ct Violet Amethyst, Pear Shape, VVS
Amethyst Product Video (724423)

105.35ct Violet Amethyst, Pear Shape, VVS

33.6 x 32.8 mm

$ 657.55

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1.16ct Yellow Citrine, Square, VVS-VS

1.16ct Yellow Citrine, Square, VVS-VS

6 x 6 mm (calibrated)

$ 8.08

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3.42ct Yellow Citrine, Oval, VS

3.42ct Yellow Citrine, Oval, VS

11 x 9 mm (calibrated)

$ 23.85

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26.97ct Green Amazonite, Fancy, Opaque

26.97ct Green Amazonite, Fancy, Opaque

40.6 x 9.4 mm

$ 8.06

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1.22ct Purple Spinel, Cushion, VS
Spinel Product Video (719710)

1.22ct Purple Spinel, Cushion, VS

6.1 x 5.7 mm

$ 202.52

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1.20ct Yellow Citrine, Round, VVS-VS

1.20ct Yellow Citrine, Round, VVS-VS

7 mm (calibrated)

$ 7.97

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5.59ct Violet Amethyst, Cushion, VVS

5.59ct Violet Amethyst, Cushion, VVS

15.2 x 9.1 mm

$ 38.98

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2.85ct Yellow Citrine, Oval, VVS-VS

2.85ct Yellow Citrine, Oval, VVS-VS

11 x 9 mm (calibrated)

$ 19.87

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2.06ct Red Pyrope Garnet, Square, VVS-VS

2.06ct Red Pyrope Garnet, Square, VVS-VS

7 x 7 mm (calibrated)

$ 15.79

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11.49ct White Rainbow Moonstone, Round, Transparent

11.49ct White Rainbow Moonstone, Round, Transparent

14 mm (calibrated)

$ 205.99

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16.82ct Multicolor Agate, Oval, Opaque

16.82ct Multicolor Agate, Oval, Opaque

17.9 x 14.5 mm

$ 16.75

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6.97ctw Violet Amethyst, Oval, Transparent

6.97ctw Violet Amethyst, Oval, Transparent

10 x 8 mm (calibrated)

$ 38.19

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34.68ct Green Bloodstone, Round, Opaque

34.68ct Green Bloodstone, Round, Opaque

27.2 mm

$ 15.89

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3.39ct Multicolor Opal, Cushion, Transparent
Opal Product Video (505828)

3.39ct Multicolor Opal, Cushion, Transparent

12.4 x 8.5 mm

$ 78.00

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11.30ctw Violet Amethyst, Cushion, VVS

11.30ctw Violet Amethyst, Cushion, VVS

15.1 x 9.1 mm

$ 67.53

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109.54ct Violet Amethyst, Square, Opaque

109.54ct Violet Amethyst, Square, Opaque

27.5 x 27 mm

$ 90.92

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1.00ctw Green Peridot, Oval, VS

1.00ctw Green Peridot, Oval, VS

6 x 4 mm (calibrated)

$ 10.96

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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

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

Loved the price and the quality and the certification options which is the main reason why I buy. The guarantee is also a great reason to use gem select.

Posted By Sal in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The stones are very nice.

Posted By Mvk in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Found a rock that met my need. Bought it!

Posted By Skot in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
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
→ View All GemSelect Reviews on Bizrate
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