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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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1.50ctw Red Pyrope Garnet, Square, VVS

1.50ctw Red Pyrope Garnet, Square, VVS

5 x 5 mm (calibrated)

$ 11.50

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0.74ct Yellow Beryl, Oval, VVS-VS

0.74ct Yellow Beryl, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 18.43

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12.31ct Brown Smoky Quartz, Emerald Cut, VVS

12.31ct Brown Smoky Quartz, Emerald Cut, VVS

13 x 13 mm (calibrated)

$ 24.29

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2.18ctw White Rainbow Moonstone, Square, Transparent

2.18ctw White Rainbow Moonstone, Square, Transparent

3 x 3 mm (calibrated)

$ 40.60

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51.41ct Pink Rose Quartz, Oval, Transparent

51.41ct Pink Rose Quartz, Oval, Transparent

26.3 x 21.7 mm

$ 92.37

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4.39ctw Multicolor Spectrolite, Oval, Opaque

4.39ctw Multicolor Spectrolite, Oval, Opaque

10 x 8 mm (calibrated)

$ 20.07

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1.88ct Red Almandine Garnet, Marquise, VVS

1.88ct Red Almandine Garnet, Marquise, VVS

12 x 6 mm

$ 70.22

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0.62ct Yellow Color-Change Diaspore, Marquise, VVS-VS

0.62ct Yellow Color-Change Diaspore, Marquise, VVS-VS

9.3 x 4.2 mm

$ 21.76

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2.77ct White Rainbow Moonstone, Oval, Transparent

2.77ct White Rainbow Moonstone, Oval, Transparent

11 x 9 mm (calibrated)

$ 88.29

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1.34ct Orange Hessonite Garnet, Emerald Cut, VS

1.34ct Orange Hessonite Garnet, Emerald Cut, VS

7 x 5 mm (calibrated)

$ 19.93

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4.95ct Pink Strawberry Quartz, Oval, Translucent

4.95ct Pink Strawberry Quartz, Oval, Translucent

12 x 10 mm (calibrated)

$ 59.16

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31.64ct Black Nuummite, Cushion, Opaque

31.64ct Black Nuummite, Cushion, Opaque

24.4 x 15.4 mm

$ 138.98

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17.84ct Multicolor Jasper, Fancy, Opaque

17.84ct Multicolor Jasper, Fancy, Opaque

34.6 x 14.7 mm

$ 23.46

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6.76ct Violet Amethyst, Briolette, VS

6.76ct Violet Amethyst, Briolette, VS

15.8 x 8.1 mm

$ 29.62

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19.78ct Violet Amethyst, Emerald Cut, VVS-VS

19.78ct Violet Amethyst, Emerald Cut, VVS-VS

18.2 x 14.1 mm

$ 137.90

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0.44ct Yellow Citrine, Heart, VVS-VS

0.44ct Yellow Citrine, Heart, VVS-VS

5 x 5 mm (calibrated)

$ 3.50

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22.58ct Blue Turquoise, Oval, Opaque

22.58ct Blue Turquoise, Oval, Opaque

26.5 x 15.2 mm

$ 67.47

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22.09ct Multicolor Jasper, Pear Shape, Opaque

22.09ct Multicolor Jasper, Pear Shape, Opaque

25.6 x 16.8 mm

$ 12.54

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544.20ct Yellow Citrine, Oval, IF
Citrine Product Video (750837)

544.20ct Yellow Citrine, Oval, IF

66.6 x 42.2 mm

$ 4,516.86

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2.37ct Orange Hessonite Garnet, Oval, VS-SI

2.37ct Orange Hessonite Garnet, Oval, VS-SI

9 x 7 mm (calibrated)

$ 51.93

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14.34ct Multicolor Jasper, Oval, Opaque

14.34ct Multicolor Jasper, Oval, Opaque

20 x 15 mm (calibrated)

$ 23.56

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0.95ct Gray Sillimanite Cat'S Eye, Oval, Transparent

0.95ct Gray Sillimanite Cat'S Eye, Oval, Transparent

7 x 4.6 mm

$ 3.13

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14.22ctw Black Spinel, Round, Opaque

14.22ctw Black Spinel, Round, Opaque

12 mm (calibrated)

$ 46.75

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1.21ct Multicolor Opal, Oval, Transparent

1.21ct Multicolor Opal, Oval, Transparent

10 x 7 mm (calibrated)

$ 54.23

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 -> 9 star ratings

It was fine . Wish there had been more round stones to select from

Posted By Emm in January, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Everything was good, the purchase was what I expected and what they show is what you get.

Posted By Mr. in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Web site is very simple to navigate Selection is terrific

Posted By ToRa.62 in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

GemSelect offers excellent choices, prices & service- highly recommended! Unfortunately, prior to ordering a replacement gemstone, my jeweler neglected to mention it needed to be one that was a'cushion cuta' to fit the existing mount. Have yet to return/exchangea'

Posted By CJ in March, 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

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
→ View All GemSelect Reviews on Bizrate
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