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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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1.82ct White Sillimanite Cat'S Eye, Oval, Transparent

1.82ct White Sillimanite Cat'S Eye, Oval, Transparent

8 x 6 mm (calibrated)

$ 5.98

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15.45ct Multicolor Quartz With Marcasite, Fancy, Transparent

15.45ct Multicolor Quartz With Marcasite, Fancy, Transparent

24.1 x 15.1 mm

$ 84.64

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7.13ct Pink Strawberry Quartz, Round, Translucent

7.13ct Pink Strawberry Quartz, Round, Translucent

12 mm (calibrated)

$ 49.71

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65.85ct Multicolor Ruby-Zoisite, Baguette, Opaque
Ruby-Zoisite Product Video (484041)

65.85ct Multicolor Ruby-Zoisite, Baguette, Opaque

25.7 x 22.3 mm

$ 108.22

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12.50ct Brown Smoky Quartz, Emerald Cut, VVS-VS
Smoky Quartz Product Video (533010)

12.50ct Brown Smoky Quartz, Emerald Cut, VVS-VS

14 x 14 mm (calibrated)

$ 20.55

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54.75ct White Dendritic Agate, Oval, Opaque

54.75ct White Dendritic Agate, Oval, Opaque

36.9 x 23.7 mm

$ 38.18

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30.59ctw Multicolor Coral, Cushion, Opaque

30.59ctw Multicolor Coral, Cushion, Opaque

18 x 13 mm (calibrated)

$ 57.98

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43.77ct Multicolor Jasper, Pear Shape, Opaque

43.77ct Multicolor Jasper, Pear Shape, Opaque

40.1 x 21.9 mm

$ 47.96

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41.79ct Multicolor Jasper, Fancy, Translucent

41.79ct Multicolor Jasper, Fancy, Translucent

41.8 x 25 mm

$ 32.97

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1.18ct Green Tsavorite Garnet, Oval, SI
Tsavorite Garnet Product Video (415398)

1.18ct Green Tsavorite Garnet, Oval, SI

6.5 x 5.5 mm

$ 646.40

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7.57ct Pink Strawberry Quartz, Oval, Translucent

7.57ct Pink Strawberry Quartz, Oval, Translucent

12.9 x 10.1 mm

$ 45.62

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2.02ct Red Ruby, Cushion, SI
Ruby Product Video (569416)

2.02ct Red Ruby, Cushion, SI

7 x 7 mm (calibrated)

$ 7,507.62

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12.84ct Green Tsavorite Garnet, Pear Shape, Translucent
Tsavorite Garnet Product Video (521325)

12.84ct Green Tsavorite Garnet, Pear Shape, Translucent

22.1 x 11.3 mm

$ 281.35

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9.93ct Brown Smoky Quartz, Round, VVS-VS
Smoky Quartz Product Video (602189)

9.93ct Brown Smoky Quartz, Round, VVS-VS

15 mm (calibrated)

$ 40.03

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2.34ct Orange Hessonite Garnet, Emerald Cut, VS-SI

2.34ct Orange Hessonite Garnet, Emerald Cut, VS-SI

8.3 x 6.7 mm

$ 43.44

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6.65ct Yellow Color-Change Diaspore, Cushion, VS-SI
Color-Change Diaspore Product Video (381560)

6.65ct Yellow Color-Change Diaspore, Cushion, VS-SI

12 x 10 mm (calibrated)

$ 3,131.71

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20.59ct Multicolor Quartz With Marcasite, Round, Transparent
Quartz With Marcasite Product Video (523835)

20.59ct Multicolor Quartz With Marcasite, Round, Transparent

17 mm (calibrated)

$ 135.35

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27.42ct Multicolor Obsidian, Cushion, Opaque
Obsidian Product Video (523599)

27.42ct Multicolor Obsidian, Cushion, Opaque

30 x 22 mm (calibrated)

$ 23.12

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40.40ctw Multicolor Fossil Coral, Pear Shape, Opaque
Fossil Coral Product Video (514339)

40.40ctw Multicolor Fossil Coral, Pear Shape, Opaque

25.1 x 16.4 mm

$ 87.64

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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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1.68ct Orange Hessonite Garnet, Cushion, VS-SI

1.68ct Orange Hessonite Garnet, Cushion, VS-SI

6.7 x 6.7 mm

$ 27.23

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46.16ct Pink Rose Quartz, Oval, Transparent

46.16ct Pink Rose Quartz, Oval, Transparent

24.5 x 20.7 mm

$ 101.14

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27.29ct White Rainbow Moonstone, Baguette, Transparent
Rainbow Moonstone Product Video (668805)

27.29ct White Rainbow Moonstone, Baguette, Transparent

28.9 x 12 mm

$ 489.25

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27.23ct Multicolor Amethyst Geode Slice, Fancy, Transparent

27.23ct Multicolor Amethyst Geode Slice, Fancy, Transparent

27 x 20 mm (calibrated)

$ 29.03

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

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

My whole experience is great.

Posted By Ghs in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The citrine gems are beautiful. I appreciated that each stone was individually shown on the website so I could see exactly what I was getting. No mystery person selecting random stones for me. The documentation included with each gem was high quality as well. Great price and arrived as expected.

Posted By Jen in December, 2025
Source: Bizrate

Overall Rating -> 8 star ratings

I've purchased things from GemSelect before. What you see is what you get, which is not always the case with gem sites online. You can find some good value with gem select, and I will buy from them again.

Posted By Meyeusername in March, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Very easy to navigate with a great selection.

Posted By Bar181 in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

good navigation and simple interface.

Posted By Dave in April, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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