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
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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 |
15.32ct Red Star Garnet, Oval, Opaque
17.2 x 10.6 mm
$ 15.87
3.09ctw Blue Star Sapphire, Oval, Opaque
7.2 x 5.4 mm
$ 70.78
15.55ct Purple Star Ruby, Oval, Opaque
15.7 x 13.6 mm
$ 204.44
1.95ct Blue Star Sapphire, Oval, Opaque
8 x 6 mm (calibrated)
$ 44.67
4.46ctw Blue Star Sapphire, Oval, Opaque
7.1 x 5.3 mm
$ 97.72
12.73ctw Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 63.40
62.52ct Red Star Garnet, Round, Opaque
21.5 mm
$ 61.64
4.63ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 19.21
4.92ct Black Star Sapphire, Oval, Opaque
11 x 9 mm (calibrated)
$ 97.61
4.05ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 88.74
5.11ct Black Star Sapphire, Oval, Opaque
10 x 8 mm (calibrated)
$ 76.34
5.06ct Purple Star Ruby, Oval, Opaque
12.2 x 9.2 mm
$ 105.00
5.90ct Black Star Diopside, Oval, Opaque
12 x 10 mm (calibrated)
$ 29.38
14.78ct Purple Star Ruby, Oval, Opaque
15.6 x 12.9 mm
$ 194.32
11.48ct Purple Star Ruby, Oval, Opaque
14.1 x 11.4 mm
$ 150.94
18.38ct Purple Star Ruby, Oval, Opaque
16.2 x 13.3 mm
$ 241.65
30.08ct Yellow Star Sapphire, Oval, Opaque
18.7 x 16.4 mm
$ 296.60
30.03ct Red Star Garnet, Oval, Opaque
18.9 x 14.5 mm
$ 29.61
8.87ctw Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 44.17
5.38ct Brown Star Moonstone, Oval, Translucent
12.6 x 8.5 mm
$ 23.57
55.50ct Red Star Garnet, Oval, Opaque
22.4 x 19.5 mm
$ 54.73
40.20ct Pink Star Rose Quartz, Oval, Translucent
21.8 x 16.6 mm
$ 66.73
3.97ct Purple Star Ruby, Oval, Opaque
10.1 x 9 mm
$ 63.26
5.15ct Red Star Ruby, Oval, Opaque
10 x 8.5 mm
$ 82.07
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Why Buy Star Gemstones from GemSelect?
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- Supplying natural gemstones to jewelers and collectors in 120+ countries
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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
GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!
Overall Rating -> 10 
It was all good
Overall Rating -> 10
Easy to use website
Overall Rating -> 10
Very good.
Overall Rating -> 10
this site is awesome. I was able to look at the products think about purchasing and come back and find the same products. With the amount of inventory gem select has. Its awesome to be able to filter the way that they allow you too.
Overall Rating -> 8 
It was a good interaction I got a good gemstone for cheap
Overall Rating -> 8
First time using this website. It was both exciting finding things in my price range and things Iam gonna save up for and use in other pieces. I love that the picture of the gem is the exact gem I'll be buying. I haven't tested the gems yes but they said they sold me 100% natural gems.
