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Home › Gemstones › Natural Untreated Gemstones

Natural Untreated Gemstones

Discover genuine untreated gemstones selected for natural beauty, rarity, and authenticity.

Natural Untreated Gemstones Weight
Natural Untreated Gemstones Size
Natural Untreated Gemstones Clarity
Natural Untreated Gemstones Price
Natural Untreated Gemstones Treatment

Size Explained

Choose Size or Size Range
For Example: 6-7
For Example: 8-9
Bi-color Natural Untreated Gemstones
Black Natural Untreated Gemstones
Blue Natural Untreated Gemstones
Brown Natural Untreated Gemstones
Golden Natural Untreated Gemstones
Gray Natural Untreated Gemstones
Green Natural Untreated Gemstones
Multicolor Natural Untreated Gemstones
Orange Natural Untreated Gemstones
Pink Natural Untreated Gemstones
Purple Natural Untreated Gemstones
Red Natural Untreated Gemstones
Turquoise Natural Untreated Gemstones
Violet Natural Untreated Gemstones
White Natural Untreated Gemstones
Yellow Natural Untreated Gemstones
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1.35ct Yellow Color-Change Diaspore, Emerald Cut, VS-SI

1.35ct Yellow Color-Change Diaspore, Emerald Cut, VS-SI

10.5 x 3.7 mm

$ 72.60

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46.56ctw Gray Hematite, Heart, Opaque
Hematite Product Video (342504)

46.56ctw Gray Hematite, Heart, Opaque

20.3 x 19.1 mm

$ 77.29

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2.37ctw Multicolor Andalusite, Round, VS-SI

2.37ctw Multicolor Andalusite, Round, VS-SI

4 mm (calibrated)

$ 116.85

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5.81ct Brown Cat'S Eye Scapolite, Oval, Translucent

5.81ct Brown Cat'S Eye Scapolite, Oval, Translucent

11.5 x 9.3 mm

$ 31.83

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16.47ctw Green Aventurine, Pear Shape, Translucent

16.47ctw Green Aventurine, Pear Shape, Translucent

21.6 x 14.4 mm

$ 38.08

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1.37ct Yellow Color-Change Diaspore, Pear Shape, VS-SI

1.37ct Yellow Color-Change Diaspore, Pear Shape, VS-SI

10 x 5.7 mm

$ 65.59

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0.31ct Green Kornerupine, Oval, VS-SI

0.31ct Green Kornerupine, Oval, VS-SI

4.7 x 3.7 mm

$ 26.55

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2.36ctw Pink Morganite, Oval, VS

2.36ctw Pink Morganite, Oval, VS

8 x 6 mm (calibrated)

$ 129.28

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29.75ct White Howlite, Cushion, Opaque

29.75ct White Howlite, Cushion, Opaque

27.4 x 18.2 mm

$ 14.23

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8.03ct Yellow Apatite, Pear Shape, VS
Apatite Product Video (385931)

8.03ct Yellow Apatite, Pear Shape, VS

17 x 11 mm

$ 424.06

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0.14ctw Black Diamond, Square, Opaque

0.14ctw Black Diamond, Square, Opaque

2.2 x 2.2 mm

$ 69.72

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6.48ct Green Actinolite Cat'S Eye, Oval, Translucent

6.48ct Green Actinolite Cat'S Eye, Oval, Translucent

14.8 x 11.7 mm

$ 45.18

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15.88ct Pink Kunzite, Pear Shape, VVS-VS
Kunzite Product Video (427407)

15.88ct Pink Kunzite, Pear Shape, VVS-VS

18.5 x 12.3 mm

$ 313.16

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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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13.71ct Yellow Apatite, Cushion, VS
Apatite Product Video (407302)

13.71ct Yellow Apatite, Cushion, VS

14.9 x 14 mm

$ 566.28

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23.21ctw Multicolor Pietersite, Fancy, Opaque

23.21ctw Multicolor Pietersite, Fancy, Opaque

31.2 x 18.6 mm

$ 87.61

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1.20ct Yellow Chrysoberyl, Oval, VVS-VS
Chrysoberyl Product Video (366388)

1.20ct Yellow Chrysoberyl, Oval, VVS-VS

8 x 6 mm (calibrated)

$ 139.93

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24.86ctw Multicolor Fossil Coral, Cushion, Opaque

24.86ctw Multicolor Fossil Coral, Cushion, Opaque

18.7 x 12.5 mm

$ 53.93

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8.27ct Orange Spessartite Garnet, Pear Shape, Transparent
Spessartite Garnet Product Video (381576)

8.27ct Orange Spessartite Garnet, Pear Shape, Transparent

12 x 12 mm (calibrated)

$ 221.29

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12.65ct Brown Smoky Quartz, Round, VS

12.65ct Brown Smoky Quartz, Round, VS

16 mm (calibrated)

$ 20.80

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8.89ct Brown Smoky Quartz, Emerald Cut, VVS-VS

8.89ct Brown Smoky Quartz, Emerald Cut, VVS-VS

13 x 13 mm (calibrated)

$ 48.70

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15.82ctw Black Spinel, Round, Opaque

15.82ctw Black Spinel, Round, Opaque

12 mm (calibrated)

$ 52.00

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10.16ct Multicolor Rainbow Pyrite, Pear Shape, Opaque

10.16ct Multicolor Rainbow Pyrite, Pear Shape, Opaque

22.3 x 15.9 mm

$ 35.71

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42.52ct Black Nuummite, Oval, Opaque
Nuummite Product Video (521201)

42.52ct Black Nuummite, Oval, Opaque

27.7 x 25.4 mm

$ 148.30

View Gem
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Why Buy Natural Untreated Gemstones from GemSelect?

Why Choose Untreated Gemstones?

Untreated gemstones are valued for their natural color and clarity without artificial enhancement. Many buyers prefer these gems for authenticity, rarity, and long-term value.

Natural Loose Untreated Gems Online

Shop loose untreated gemstones online at GemSelect with confidence. Browse sapphires, rubies, spinels, aquamarine, garnet, tourmaline, and more with full disclosure.

Natural Untreated Gemstones for Jewelry and Collecting

Untreated Gemstones for Jewelry

Natural untreated gems are excellent for rings, earrings, pendants, and custom jewelry. Their original beauty makes every piece unique and meaningful.

Popular Untreated Gemstone Types

Popular choices include untreated sapphire, ruby, spinel, garnet, tourmaline, zircon, aquamarine, and many collector stones in a wide range of colors.

Certified Natural Gemstones

Many buyers choose untreated gemstones with gemological reports for added confidence. Certification can confirm identity and indicate whether treatments are present.

Collector Quality Untreated Gems

Collectors appreciate untreated gemstones because naturally fine examples are rarer than treated material. These stones can be especially desirable when color and clarity are strong.

Calibrated Untreated Gemstones

We also offer calibrated untreated gemstones in popular sizes suitable for standard jewelry settings, making custom designs easier and faster.

Worldwide Shipping from GemSelect

GemSelect offers secure online ordering, detailed product images, and worldwide delivery so you can shop untreated gemstones from anywhere.

Learn more about gemstone treatments, identification, and care on our Gemstone Information Pages.

FAQs

What does untreated gemstone mean?

An untreated gemstone has not undergone enhancement processes such as heating, dyeing, filling, coating, or diffusion to improve appearance.

Are untreated gemstones more valuable?

Often yes, especially in sapphire, ruby, and other premium gems where fine untreated stones are rarer than treated examples.

How can I verify a gemstone is untreated?

Independent laboratory certification is the best way to verify whether a gemstone is natural and untreated.

Which gemstones are commonly sold untreated?

Spinel, garnet, zircon, tourmaline, aquamarine, and some sapphires or rubies are often available untreated depending on source and quality.

Are all untreated gemstones natural?

Natural untreated gemstones are mined stones that have not been enhanced after cutting. Always buy from trusted sellers with clear disclosure.

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

Great site for finding specific stones and sizes for individual pieces of jewelry

Posted By Designer in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.

Posted By Tim W in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Wonderful purchase, can't wait to see the stone.

Posted By Tim in January, 2026
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

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

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
→ View All GemSelect Reviews on Bizrate
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