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Natural Star Gemstones

Discover rare star gemstones displaying the fascinating star effect known as asterism, perfect for collectors and unique jewelry designs.

Star Gemstones Weight
Star Gemstones Size
Star Gemstones Clarity
Star Gemstones Price

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Black Star Gemstones
Blue Star Gemstones
Brown Star Gemstones
Gray Star Gemstones
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Orange Star Gemstones
Pink Star Gemstones
Purple Star Gemstones
Red Star Gemstones
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Violet
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Yellow Star Gemstones
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1.76ct Blue Star Sapphire, Oval, Opaque

1.76ct Blue Star Sapphire, Oval, Opaque

7 x 5 mm (calibrated)

$ 48.58

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9.79ct Brown Star Moonstone, Oval, Translucent

9.79ct Brown Star Moonstone, Oval, Translucent

12.7 x 10.3 mm

$ 51.70

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4.38ct Black Star Sapphire, Oval, Opaque

4.38ct Black Star Sapphire, Oval, Opaque

10 x 8 mm (calibrated)

$ 88.13

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2.74ctw Blue Star Sapphire, Oval, Opaque

2.74ctw Blue Star Sapphire, Oval, Opaque

7 x 5 mm (calibrated)

$ 75.62

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1.47ct Black Star Diopside, Oval, Opaque

1.47ct Black Star Diopside, Oval, Opaque

8 x 6 mm (calibrated)

$ 8.82

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6.66ct Black Star Diopside, Oval, Opaque

6.66ct Black Star Diopside, Oval, Opaque

12 x 10 mm (calibrated)

$ 39.96

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29.22ct Purple Star Ruby, Oval, Opaque

29.22ct Purple Star Ruby, Oval, Opaque

19 x 16.4 mm

$ 462.84

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3.92ctw Blue Star Sapphire, Oval, Opaque

3.92ctw Blue Star Sapphire, Oval, Opaque

7 x 5 mm (calibrated)

$ 103.49

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3.34ct Black Star Sapphire, Oval, Opaque

3.34ct Black Star Sapphire, Oval, Opaque

9.7 x 7.4 mm

$ 72.14

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1.85ct Blue Star Sapphire, Oval, Opaque

1.85ct Blue Star Sapphire, Oval, Opaque

8 x 6 mm (calibrated)

$ 74.00

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24.09ct Red Star Garnet, Oval, Opaque

24.09ct Red Star Garnet, Oval, Opaque

16 x 13 mm

$ 28.62

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4.05ct Black Star Sapphire, Oval, Opaque

4.05ct Black Star Sapphire, Oval, Opaque

9.6 x 7.1 mm

$ 87.48

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4.73ct Black Star Diopside, Oval, Opaque

4.73ct Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 28.38

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6.43ct Purple Star Ruby, Oval, Opaque

6.43ct Purple Star Ruby, Oval, Opaque

12 x 10 mm (calibrated)

$ 101.86

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6.15ct Black Star Diopside, Oval, Opaque

6.15ct Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 36.90

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5.51ct Black Star Diopside, Oval, Opaque

5.51ct Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 33.06

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6.26ctw Blue Star Sapphire, Oval, Opaque

6.26ctw Blue Star Sapphire, Oval, Opaque

7 x 5 mm (calibrated)

$ 135.22

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13.67ct Red Star Ruby, Oval, Opaque

13.67ct Red Star Ruby, Oval, Opaque

14 x 12 mm (calibrated)

$ 216.53

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5.83ct Yellow Star Moonstone, Oval, Translucent

5.83ct Yellow Star Moonstone, Oval, Translucent

13.2 x 10.6 mm

$ 30.78

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24.49ct Purple Star Ruby, Oval, Opaque

24.49ct Purple Star Ruby, Oval, Opaque

16.5 x 15 mm

$ 387.92

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4.41ct Red Star Ruby, Oval, Opaque

4.41ct Red Star Ruby, Oval, Opaque

9.5 x 8.2 mm

$ 84.67

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40.98ct Red Star Garnet, Round, Opaque

40.98ct Red Star Garnet, Round, Opaque

17 mm (calibrated)

$ 48.68

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3.16ct Red Star Ruby, Oval, Opaque

3.16ct Red Star Ruby, Oval, Opaque

10.6 x 8.1 mm

$ 60.67

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0.62ct Blue Star Sapphire, Round, Opaque

0.62ct Blue Star Sapphire, Round, Opaque

5 mm (calibrated)

$ 24.80

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Why Buy Star Gemstones from GemSelect?

Natural Star Gemstones

Our natural star gemstones display the rare optical phenomenon known as asterism, where a star-shaped reflection appears across the gem’s surface. These unique stones are prized by collectors and jewelers for their striking appearance and rarity.

Star Gemstones Online

Buy star gemstones online at GemSelect with confidence. Our collection includes star sapphire, star ruby, and other rare gems with visible star effects, all available as loose stones ready for custom jewelry.

Loose Star Gemstones with Asterism

The Unique Star Effect (Asterism)

The star seen in these gemstones is caused by tiny needle-like inclusions that reflect light in a star-shaped pattern. This optical phenomenon, called asterism, becomes visible when the gemstone is cut as a smooth cabochon.

Star Sapphire Gemstones

Star sapphire is the most famous star gemstone, often displaying a clear six-rayed star across its surface. These gems are durable and popular for rings, pendants, and collector pieces.

Star Ruby Gemstones

Star rubies are rare and highly valued. When illuminated, they reveal a sharp star pattern over their deep red body color, making them one of the most sought-after asterism gemstones.

Cabochon Cut Star Stones

Star gemstones are typically cut as cabochons rather than faceted stones. The smooth, domed surface allows the star effect to appear clearly when the gem is viewed under direct light.

Loose Star Gemstones for Jewelry

Loose star gemstones are perfect for custom jewelry designs. Their distinctive optical effect makes them ideal for rings, pendants, and statement pieces that stand out from traditional faceted gems.

Collectible Star Gemstones

Many collectors seek star gemstones due to their rarity and unusual appearance. High-quality stones with centered and well-defined stars are especially desirable among gem enthusiasts.

Learn more about the properties and fascinating optical effects of gemstones on our Gemstone Optical Effects Guide.

FAQs

What are star gemstones?

Star gemstones are gems that display a star-shaped reflection on their surface. This optical phenomenon is called asterism and is most commonly seen in star sapphire and star ruby.

What causes the star effect in gemstones?

The star effect is caused by microscopic needle-like inclusions inside the gem that reflect light in intersecting lines, creating a visible star pattern when viewed under direct light.

Which gemstones show a star effect?

The most well-known star gemstones are star sapphire and star ruby, but asterism can also appear in gems like star garnet, star diopside, and occasionally in quartz.

Why are star gemstones cut as cabochons?

The cabochon cut allows the star pattern to appear clearly on the gem’s surface. Faceting would disrupt the optical effect and prevent the star from forming.

How can you see the star in a gemstone?

The star becomes visible when light hits the surface of the gemstone. Rotating the stone under a light source will make the star move across the surface.

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
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Great experience. I can't wait to explore on the website further.

Posted By Kymmie in September, 2025
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Overall Rating -> 10 star ratings

I've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.

Posted By Maggie in August, 2025
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Overall Rating -> 10 star ratings

I could see the actual gem I was buying

Posted By Bugs in December, 2025
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Overall Rating -> 10 star ratings

I purchased from you before and I have never been disappointed. I always received what I expected and your products are very nice.

Posted By MVK in July, 2025
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Overall Rating -> 10 star ratings

Very neat and to the point

Posted By Botha in March, 2026
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