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
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Blue
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Brown
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Golden
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Gray
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Green
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Multicolor
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Orange
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Pink
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Purple
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Red
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Turquoise
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Violet
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White
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Yellow
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Single |
Pairs |
Lots |
Faceted |
Cabochons |
5.69ct Purple Star Ruby, Oval, Opaque
12 x 10 mm (calibrated)
$ 262.77
41.19ct Black Star Sapphire, Oval, Opaque
20.2 x 18.1 mm
$ 533.32
20.70ct Brown Star Sunstone, Oval, Opaque
19 x 15.5 mm
$ 171.81
7.15ct Black Star Diopside, Oval, Opaque
12 x 10 mm (calibrated)
$ 35.61
34.69ct Yellow Star Sapphire, Oval, Opaque
19.3 x 16.2 mm
$ 310.96
18.38ct Purple Star Ruby, Oval, Opaque
16.2 x 13.3 mm
$ 241.65
69.04ct Red Star Garnet, Oval, Opaque
27.5 x 22.2 mm
$ 68.08
58.57ct Yellow Star Sapphire, Oval, Opaque
23.2 x 19.9 mm
$ 577.52
3.73ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 73.55
0.68ct Blue Star Sapphire, Oval, Opaque
5.2 x 4.2 mm
$ 22.58
1.85ct Black Star Diopside, Oval, Transparent
8 x 6 mm (calibrated)
$ 9.21
1.63ct Blue Star Sapphire, Oval, Opaque
7.3 x 5.4 mm
$ 37.34
4.60ct Black Star Sapphire, Oval, Opaque
10.2 x 8.9 mm
$ 91.63
20.21ct Purple Star Ruby, Oval, Opaque
16.2 x 13.9 mm
$ 265.70
3.25ct Red Star Ruby, Oval, Opaque
9.4 x 8.4 mm
$ 150.09
3.16ct Red Star Ruby, Oval, Opaque
10.6 x 8.1 mm
$ 50.36
8.07ct Purple Star Ruby, Oval, Opaque
12.2 x 10.7 mm
$ 106.09
4.29ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 84.60
15.06ct Purple Star Ruby, Oval, Opaque
16.1 x 11.3 mm
$ 312.50
24.21ct Red Star Garnet, Oval, Opaque
16.6 x 13.9 mm
$ 23.87
0.56ct Blue Star Sapphire, Oval, Opaque
5.2 x 4.3 mm
$ 18.59
12.41ct Red Star Garnet, Oval, Opaque
15.6 x 12.6 mm
$ 12.24
0.61ct Blue Star Sapphire, Oval, Opaque
6 x 4.2 mm
$ 20.25
7.95ct Yellow Star Moonstone, Oval, Translucent
13.5 x 10.3 mm
$ 34.84
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
GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!
Overall Rating -> 10 
GemSelect offers excellent choices, prices & service- highly recommended! Unfortunately, prior to ordering a replacement gemstone, my jeweler neglected to mention it needed to be one that was a'cushion cuta' to fit the existing mount. Have yet to return/exchangea'
Overall Rating -> 10
No problems. I had a minor address issue in the past and someone got back to me very quickly and we resolved the issue satisfactorily. I appreciated the quick, concerned response. So important when buyer/seller are so far apart in distance. Thank you Gem Select. Keep up the good work!
Overall Rating -> 10
I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.
Overall Rating -> 10
Great website, easy to navigate, and loads quickly. Have bought here before, very pleased!
Overall Rating -> 9 
The website was easy to use and informative of the selection of stones it has. I quickly found the right stone for me.
Overall Rating -> 9
Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly
