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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
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Star Gemstones Price

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Black Star Gemstones
Blue Star Gemstones
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Gray Star Gemstones
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Orange Star Gemstones
Pink Star Gemstones
Purple Star Gemstones
Red Star Gemstones
Turquoise
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9.58ct Reddish Purple Star Ruby, Oval, Opaque

9.58ct Reddish Purple Star Ruby, Oval, Opaque

12.7 x 10.4 mm

$ 151.75

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3.39ctw Deep Navy Blue Star Sapphire, Oval, Opaque

3.39ctw Deep Navy Blue Star Sapphire, Oval, Opaque

7 x 5 mm (calibrated)

$ 89.50

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9.23ct Reddish Purple Star Ruby, Oval, Opaque

9.23ct Reddish Purple Star Ruby, Oval, Opaque

13 x 11 mm (calibrated)

$ 146.21

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1.60ct Dark Blue Star Sapphire, Oval, Opaque

1.60ct Dark Blue Star Sapphire, Oval, Opaque

7 x 5 mm (calibrated)

$ 44.16

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4.12ct Wine Red Star Ruby, Oval, Opaque

4.12ct Wine Red Star Ruby, Oval, Opaque

9.4 x 8.4 mm

$ 79.10

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7.88ct Cantaloupe Orange Star Moonstone, Oval, Translucent

7.88ct Cantaloupe Orange Star Moonstone, Oval, Translucent

12 x 10 mm (calibrated)

$ 37.82

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15.14ct Pinkish Purple Star Ruby, Oval, Opaque

15.14ct Pinkish Purple Star Ruby, Oval, Opaque

14 x 12 mm (calibrated)

$ 239.82

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8.09ct Black Star Diopside, Round, Opaque

8.09ct Black Star Diopside, Round, Opaque

11 mm (calibrated)

$ 48.54

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45.48ct Dark Red Star Garnet, Oval, Opaque

45.48ct Dark Red Star Garnet, Oval, Opaque

23.4 x 17.5 mm

$ 54.04

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2.34ct Black Star Sapphire, Oval, Opaque

2.34ct Black Star Sapphire, Oval, Opaque

9 x 6.7 mm

$ 50.54

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4.52ct Deep Magenta Star Ruby, Oval, Opaque

4.52ct Deep Magenta Star Ruby, Oval, Opaque

8.9 x 8.4 mm

$ 251.49

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11.81ct Mahogany Red Star Garnet, Oval, Opaque

11.81ct Mahogany Red Star Garnet, Oval, Opaque

14 x 12 mm (calibrated)

$ 14.03

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2.74ctw Deep Navy Blue Star Sapphire, Oval, Opaque

2.74ctw Deep Navy Blue Star Sapphire, Oval, Opaque

7 x 5 mm (calibrated)

$ 75.62

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4.54ctw Deep Navy Blue Star Sapphire, Oval, Opaque

4.54ctw Deep Navy Blue Star Sapphire, Oval, Opaque

7 x 5 mm (calibrated)

$ 107.87

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7.14ct Light Brown Star Moonstone, Oval, Translucent

7.14ct Light Brown Star Moonstone, Oval, Translucent

14 x 10 mm (calibrated)

$ 37.70

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4.32ct Black Star Diopside, Oval, Opaque

4.32ct Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 25.92

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3.03ctw Deep Blue Star Sapphire, Oval, Opaque

3.03ctw Deep Blue Star Sapphire, Oval, Opaque

7 x 5 mm (calibrated)

$ 79.99

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18.38ct Medium-Dark Purple Star Ruby, Oval, Opaque

18.38ct Medium-Dark Purple Star Ruby, Oval, Opaque

16.2 x 13.3 mm

$ 291.14

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4.63ct Black Star Sapphire, Oval, Opaque

4.63ct Black Star Sapphire, Oval, Opaque

10.2 x 8.5 mm

$ 100.01

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4.95ctw Deep Blue Star Sapphire, Oval, Opaque

4.95ctw Deep Blue Star Sapphire, Oval, Opaque

7 x 5.2 mm

$ 117.61

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2.97ct Black Star Sapphire, Oval, Opaque

2.97ct Black Star Sapphire, Oval, Opaque

9 x 7 mm (calibrated)

$ 53.46

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10.98ct Plum Purple Star Ruby, Oval, Opaque

10.98ct Plum Purple Star Ruby, Oval, Opaque

12.8 x 11.3 mm

$ 173.93

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4.99ct Pale Brown Star Moonstone, Oval, Translucent

4.99ct Pale Brown Star Moonstone, Oval, Translucent

13.9 x 11.2 mm

$ 26.35

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3.16ct Medium Red Star Ruby, Oval, Opaque

3.16ct Medium Red Star Ruby, Oval, Opaque

10.6 x 8.1 mm

$ 60.67

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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

Wonderful purchase, can't wait to see the stone.

Posted By Tim in January, 2026
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Had a great experience and the prices are great

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My whole experience is great.

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Overall Rating -> 10 star ratings

Love how easy the site is to use. Really love that the pictures are of actual product.

Posted By LeAnn in January, 2026
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Overall Rating -> 9 star ratings

Will know more once order received

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

It's mostly good, only some item's are easier to find through the search than the menu

Posted By Wayne in July, 2025
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