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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
Single
Pairs
Lots
Faceted
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2.06ct Red Coral, Oval, Opaque
Coral Product Video (499203)

2.06ct Red Coral, Oval, Opaque

10.2 x 5.4 mm

$ 307.76

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3.66ct Yellow Citrine, Pear Shape, VVS-VS

3.66ct Yellow Citrine, Pear Shape, VVS-VS

12 x 10 mm (calibrated)

$ 28.59

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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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0.76ct Yellow Color-Change Diaspore, Cushion, VVS-VS

0.76ct Yellow Color-Change Diaspore, Cushion, VVS-VS

5.7 x 5 mm

$ 26.64

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33.08ct Green Maw-Sit-Sit, Baguette, Opaque

33.08ct Green Maw-Sit-Sit, Baguette, Opaque

18.3 x 15.9 mm

$ 108.72

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9.59ct Brown Tiger'S Eye, Oval, Opaque

9.59ct Brown Tiger'S Eye, Oval, Opaque

18 x 13 mm (calibrated)

$ 5.64

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3.88ctw Green Prehnite, Round, Transparent

3.88ctw Green Prehnite, Round, Transparent

7.5 mm (calibrated)

$ 17.56

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20.97ct Black Obsidian, Oval, Opaque

20.97ct Black Obsidian, Oval, Opaque

33.5 x 20.9 mm

$ 15.67

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1.06ct Yellow Color-Change Diaspore, Cushion, VVS-VS

1.06ct Yellow Color-Change Diaspore, Cushion, VVS-VS

7.3 x 5.2 mm

$ 55.47

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37.82ct Multicolor Jasper, Oval, Opaque

37.82ct Multicolor Jasper, Oval, Opaque

26.7 x 24.6 mm

$ 27.76

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0.77ct Orange Fire Opal, Oval, Translucent

0.77ct Orange Fire Opal, Oval, Translucent

8 x 6 mm (calibrated)

$ 17.58

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6.61ct Green Opal, Oval, Opaque

6.61ct Green Opal, Oval, Opaque

12.2 x 10.9 mm

$ 15.34

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23.86ct Multicolor Tiger'S Eye Matrix, Pear Shape, Opaque

23.86ct Multicolor Tiger'S Eye Matrix, Pear Shape, Opaque

21.8 x 21.3 mm

$ 13.55

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1.07ct Yellow Color-Change Diaspore, Cushion, VVS

1.07ct Yellow Color-Change Diaspore, Cushion, VVS

10.1 x 4 mm

$ 37.51

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28.24ct Brown Tiger'S Eye, Fancy, Opaque

28.24ct Brown Tiger'S Eye, Fancy, Opaque

36.9 x 10 mm

$ 8.43

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5.02ctw Multicolor Labradorite, Round, Transparent

5.02ctw Multicolor Labradorite, Round, Transparent

10 mm (calibrated)

$ 12.20

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0.68ct Green Tourmaline, Baguette, VVS

0.68ct Green Tourmaline, Baguette, VVS

9.9 x 2.9 mm

$ 23.70

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0.36ct Blue Kyanite, Round, SI

0.36ct Blue Kyanite, Round, SI

4.2 mm

$ 8.96

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1.41ct Green Tourmaline, Oval, Transparent

1.41ct Green Tourmaline, Oval, Transparent

8 x 6 mm (calibrated)

$ 24.17

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1.20ct Green Peridot, Oval, VS

1.20ct Green Peridot, Oval, VS

8 x 6 mm (calibrated)

$ 13.15

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1.28ct Orange Hessonite Garnet, Emerald Cut, VS-SI

1.28ct Orange Hessonite Garnet, Emerald Cut, VS-SI

6 x 6 mm (calibrated)

$ 25.24

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1.41ct Green Tourmaline, Oval, VVS
Tourmaline Product Video (747718)

1.41ct Green Tourmaline, Oval, VVS

7.1 x 6.5 mm

$ 163.84

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2.75ct Pink Strawberry Quartz, Round, Translucent
Strawberry Quartz Product Video (570224)

2.75ct Pink Strawberry Quartz, Round, Translucent

8 mm (calibrated)

$ 16.82

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1.05ctw White Amethyst, Cushion, Transparent

1.05ctw White Amethyst, Cushion, Transparent

5 x 5 mm (calibrated)

$ 7.32

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

It was good. There was a large selection at prices I could afford.

Posted By Zorah in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

No problems. I had a minor address issue in the past and someone got back to me very quickly and we resolved the issue satisfactorily. I appreciated the quick, concerned response. So important when buyer/seller are so far apart in distance. Thank you Gem Select. Keep up the good work!

Posted By Orphanboy in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Easy to use. No issues. Large selection of gems.

Posted By CLTCJH in February, 2026
Source: Bizrate

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 have made many purchases from GemSelect over the years, and I have a beautiful collection of jewelry as a result. My purchases have always been exactly as described, and I have enjoyed doing business with you.

Posted By MMM in July, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Although the stones are smaller than I thought, I really don't think in millimeters, they are perfect. I plan to put one into a ring and the other into a necklace. Ordering was easy, contact kept me aware of how shipping was going, and delivery was sooner than expected. The quality of stones I have ordered in the past and this recent order is outstanding and stones I will be proud to wear.

Posted By Ktreva52 in June, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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