Natural Star Gemstones
Discover rare star gemstones displaying the fascinating star effect known as asterism, perfect for collectors and unique jewelry designs.
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Bi-color
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Black Star Gemstones
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Blue Star Gemstones
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Brown Star Gemstones
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Golden Star Gemstones
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Gray Star Gemstones
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Green
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Multicolor
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Orange Star Gemstones
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Pink Star Gemstones
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Purple Star Gemstones
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Red Star Gemstones
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Turquoise
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Violet
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White
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Yellow Star Gemstones
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Single |
Pairs |
Lots |
Faceted |
Cabochons |
3.22ct Dark Blue Star Sapphire, Oval, Opaque
9 x 7 mm (calibrated)
$ 74.06
4.68ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 28.08
4.49ct Black Star Sapphire, Oval, Opaque
10.8 x 8.2 mm
$ 96.98
5.81ct Black Star Sapphire, Oval, Opaque
10.4 x 8.2 mm
$ 125.50
5.00ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 30.00
3.06ct Deep Blue Star Sapphire, Oval, Opaque
9 x 7 mm (calibrated)
$ 84.46
4.38ct Black Star Sapphire, Oval, Opaque
10.6 x 8 mm
$ 94.61
6.48ct Pale Brown Star Moonstone, Oval, Translucent
14.5 x 8.4 mm
$ 34.21
6.08ct Magenta Star Ruby, Round, Opaque
9 mm (calibrated)
$ 338.29
42.56ct Coral Pink Star Rose Quartz, Oval, Transparent
21.9 x 19 mm
$ 84.26
7.05ctw Deep Navy Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 167.51
4.60ctw Deep Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 109.30
15.62ct Pinkish Purple Star Ruby, Oval, Opaque
14.9 x 12.4 mm
$ 224.93
5.69ct Medium Dark-Purple Star Ruby, Oval, Opaque
12 x 10 mm (calibrated)
$ 316.59
7.88ct Light Grey Star Sapphire, Oval, Opaque
10.6 x 10.2 mm
$ 364.06
10.09ctw Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 50.45
8.39ct Pale Brown Star Moonstone, Oval, Translucent
12.8 x 10.1 mm
$ 33.23
3.30ct Black Star Sapphire, Oval, Opaque
10 x 8 mm (calibrated)
$ 71.28
16.94ct Medium-Light Purple Star Ruby, Oval, Opaque
16.1 x 13.6 mm
$ 268.33
3.76ct Black Star Sapphire, Oval, Opaque
10 x 8 mm (calibrated)
$ 67.68
5.32ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 26.60
1.45ct Deep Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 40.02
4.41ct Medium Red Star Ruby, Oval, Opaque
9.5 x 8.2 mm
$ 84.67
5.51ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 33.06
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Why Buy Star Gemstones from GemSelect?
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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.
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
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Overall Rating -> 8 
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Overall Rating -> 10
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Overall Rating -> 10
All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.
