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 |
3.95ct Black Star Sapphire, Oval, Opaque
10 x 8 mm (calibrated)
$ 70.82
34.69ct Yellow Star Sapphire, Oval, Opaque
19.3 x 16.2 mm
$ 310.96
12.12ct Gray Star Sapphire, Oval, Opaque
12.3 x 11.4 mm
$ 464.75
8.80ct Gray Star Sapphire, Round, Opaque
11 mm (calibrated)
$ 306.77
3.94ct Purple Star Ruby, Oval, Opaque
10 x 8.8 mm
$ 62.79
10.00ct Purple Star Ruby, Oval, Opaque
13 x 11 mm (calibrated)
$ 131.47
6.23ct Purple Star Ruby, Oval, Opaque
11 x 8.1 mm
$ 287.71
4.27ct Purple Star Ruby, Oval, Opaque
10.8 x 7.6 mm
$ 197.19
21.88ct Brown Star Sunstone, Oval, Opaque
16.6 x 14.7 mm
$ 181.60
3.94ct Blue Star Sapphire, Pear Shape, Opaque
11 x 9 mm (calibrated)
$ 130.81
4.92ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 24.50
14.01ct Red Star Garnet, Oval, Opaque
16.3 x 11.4 mm
$ 14.51
14.41ct Red Star Garnet, Round, Opaque
13 mm (calibrated)
$ 14.21
6.35ct Black Star Diopside, Oval, Opaque
12 x 10 mm (calibrated)
$ 31.62
8.17ct Purple Star Ruby, Oval, Opaque
12.5 x 9.9 mm
$ 107.41
3.34ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 65.87
4.76ct Purple Star Ruby, Oval, Translucent
10.4 x 9.7 mm
$ 62.58
3.19ct Red Star Ruby, Oval, Opaque
9.5 x 6.9 mm
$ 50.84
4.38ct Black Star Sapphire, Oval, Opaque
10 x 8 mm (calibrated)
$ 73.15
77.87ct Red Star Garnet, Oval, Opaque
25.4 x 23.1 mm
$ 76.78
3.16ct Red Star Ruby, Oval, Opaque
10.6 x 8.1 mm
$ 50.36
15.55ct Purple Star Ruby, Oval, Opaque
15.7 x 13.6 mm
$ 204.44
6.05ct Orange Star Moonstone, Oval, Translucent
12 x 10 mm (calibrated)
$ 26.51
9.59ct Red Star Ruby, Oval, Opaque
13 x 9 mm (calibrated)
$ 147.10
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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 
Enjoy viewing the selections. Excellent product
Overall Rating -> 10
A pleasant experience and many choices to choose from
Overall Rating -> 10
Easy picking, fast checkout, secure shipping. Cana't ask for anything more than efficiency and a good price.
Overall Rating -> 10
love the site, the experience and the products.
Overall Rating -> 9 
I was looking for a small gift for a friend- the process is the same as every other time and was very simple, and she even got her gift early! On the downside, there's no way to easily keep track of multiple Shipping Addresses, so if I want to send a gift to Friend A and to Friend B, I have to overwrite everything and it's a fair bit clunky in that regard.
Overall Rating -> 10
On the clarity options it goes "and better" so if youre looking for si specifically and you click si and better it still shows you basically everything. It just removes the opaques. Itd be nice if it was vs only, vss only, si only, etc
