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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
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16.82ct Multicolor Pietersite, Round, Opaque

16.82ct Multicolor Pietersite, Round, Opaque

19 mm (calibrated)

$ 63.50

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1.84ct Multicolor Opal, Marquise, Transparent

1.84ct Multicolor Opal, Marquise, Transparent

13.8 x 6.7 mm

$ 64.14

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0.86ct Orange Sphalerite, Trillion, SI-I1

0.86ct Orange Sphalerite, Trillion, SI-I1

5.8 x 5.6 mm

$ 42.83

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30.50ct Multicolor Boulder Opal, Pear Shape, Translucent
Boulder Opal Product Video (523672)

30.50ct Multicolor Boulder Opal, Pear Shape, Translucent

30 x 22 mm (calibrated)

$ 167.08

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10.37ctw Brown Moonstone, Flower Cut, Translucent

10.37ctw Brown Moonstone, Flower Cut, Translucent

12 x 12 mm (calibrated)

$ 45.45

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9.34ct Orange Star Moonstone, Oval, Translucent

9.34ct Orange Star Moonstone, Oval, Translucent

18.8 x 10.6 mm

$ 37.21

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8.13ct Green Prehnite, Fancy, Transparent

8.13ct Green Prehnite, Fancy, Transparent

18.1 x 16.9 mm

$ 13.18

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0.90ctw Green Demantoid Garnet, Oval, VS
Demantoid Garnet Product Video (458684)

0.90ctw Green Demantoid Garnet, Oval, VS

5 x 4 mm (calibrated)

$ 162.21

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0.17ct Yellow Diamond, Round, VS
Diamond Product Video (564607)

0.17ct Yellow Diamond, Round, VS

3.5 mm (calibrated)

$ 282.13

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0.75ct Green Tsavorite Garnet, Oval, SI
Tsavorite Garnet Product Video (415866)

0.75ct Green Tsavorite Garnet, Oval, SI

6.1 x 4.7 mm

$ 410.85

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12.95ct Brown Smoky Quartz, Round, Transparent

12.95ct Brown Smoky Quartz, Round, Transparent

16 mm (calibrated)

$ 42.57

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9.14ct Green Amazonite, Marquise, Opaque

9.14ct Green Amazonite, Marquise, Opaque

19.7 x 10.1 mm

$ 19.94

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49.22ct Brown Tiger'S Eye Matrix, Fancy, Opaque
Tiger's Eye Matrix Product Video (322581)

49.22ct Brown Tiger'S Eye Matrix, Fancy, Opaque

30.5 x 20.6 mm

$ 49.02

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12.03ct Turquoise Larimar, Pear Shape, Opaque
Larimar Product Video (391510)

12.03ct Turquoise Larimar, Pear Shape, Opaque

20 x 15 mm (calibrated)

$ 158.16

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48.08ct Multicolor Opal, Pear Shape, Opaque

48.08ct Multicolor Opal, Pear Shape, Opaque

40.1 x 27.1 mm

$ 143.66

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5.00ct Brown Diamond, Cushion, VS
Diamond Product Video (460455)

5.00ct Brown Diamond, Cushion, VS

9 x 9 mm (calibrated)

$ 9,203.04

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16.64ctw Multicolor Fossil Coral, Cushion, Opaque

16.64ctw Multicolor Fossil Coral, Cushion, Opaque

14.3 x 11 mm

$ 30.09

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0.86ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

0.86ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

6.3 x 4.4 mm

$ 45.40

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0.60ct Green Demantoid Garnet, Oval, VS

0.60ct Green Demantoid Garnet, Oval, VS

6 x 4.2 mm

$ 164.34

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21.74ct Pink Kunzite, Pear Shape, VS
Kunzite Product Video (437944)

21.74ct Pink Kunzite, Pear Shape, VS

23.6 x 11.7 mm

$ 476.37

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1.08ct Orange Morganite, Oval, VVS-VS

1.08ct Orange Morganite, Oval, VVS-VS

8 x 6 mm (calibrated)

$ 54.23

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0.96ct Orange Hessonite Garnet, Round, VS-SI
Hessonite Garnet Product Video (524645)

0.96ct Orange Hessonite Garnet, Round, VS-SI

5.3 mm

$ 11.56

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24.08ct Green Tourmaline, Oval, VVS
Tourmaline Product Video (417191)

24.08ct Green Tourmaline, Oval, VVS

17.4 x 14.5 mm

$ 3,997.28

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1.46ct Blue Kyanite, Round, SI-I1

1.46ct Blue Kyanite, Round, SI-I1

7 mm (calibrated)

$ 39.99

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

Filters need to be improved but rest of website is great

Posted By Rock hound in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very food

Posted By Keeto in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Have made 2 purchases so far from GemSelect and they have been amazing! Anytime I requested additional info, videos or pictures of a particular item, the response was always timely and helpful. This is a great place to buy, if you are looking for loose stones. Highly recommend!

Posted By Britnee Rose in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Enjoy viewing the selections. Excellent product

Posted By ToRa.62 in April, 2026
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

I purchased 4 gemstones in different sizes to be able to make a family ring for my granddaughter. I got exactly what I saw and they are absolutely beautiful! Shipping was quick compared to other gem stores I have dealt with! I will definitely order more stones from your company, as I am a collector and have several stones. You are my new go to company in the future

Posted By Liz in June, 2026
Source: Bizrate
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