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 |
6.43ct Purple Star Ruby, Oval, Opaque
12 x 10 mm (calibrated)
$ 84.54
7.88ct Orange Star Moonstone, Oval, Translucent
12 x 10 mm (calibrated)
$ 31.39
10.15ct Brown Star Moonstone, Oval, Translucent
19.3 x 11 mm
$ 33.37
3.19ct Red Star Ruby, Oval, Opaque
9.5 x 6.9 mm
$ 50.84
8.17ct Purple Star Ruby, Oval, Opaque
12.5 x 9.9 mm
$ 107.41
4.68ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 102.55
8.25ct Brown Star Moonstone, Oval, Translucent
14.5 x 10.6 mm
$ 36.15
64.50ct Red Star Garnet, Oval, Opaque
27.2 x 22.4 mm
$ 63.60
11.81ct Red Star Garnet, Oval, Opaque
14 x 12 mm (calibrated)
$ 11.64
4.31ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 21.46
4.05ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 88.74
1.23ct Blue Star Sapphire, Oval, Opaque
6.9 x 4.6 mm
$ 40.43
24.09ct Red Star Garnet, Oval, Opaque
16 x 13 mm
$ 23.75
20.07ct Red Star Garnet, Oval, Opaque
17.4 x 14.5 mm
$ 19.79
21.95ct Purple Star Ruby, Oval, Opaque
16.1 x 14.5 mm
$ 288.58
1.44ct Black Star Diopside, Oval, Opaque
8 x 6 mm (calibrated)
$ 7.17
4.97ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 24.75
3.86ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 76.13
3.46ctw Blue Star Sapphire, Oval, Opaque
7 x 5.2 mm
$ 79.27
3.37ctw Blue Star Sapphire, Oval, Opaque
7 x 5.2 mm
$ 73.85
3.24ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 63.89
4.73ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 23.56
7.55ct Brown Star Moonstone, Oval, Translucent
12.5 x 9.8 mm
$ 33.08
0.65ct Blue Star Sapphire, Oval, Opaque
5 x 4 mm (calibrated)
$ 21.58
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 
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
Overall Rating -> 9 
Fast snd easy to find what I was looking for
Overall Rating -> 10
Easy picking, fast checkout, secure shipping. Cana't ask for anything more than efficiency and a good price.
Overall Rating -> 7 
Easy, quick.
Overall Rating -> 10
Absolutely love the website, selection and products. Can you guys add a gemstones with inclusions tab. I like those it'd be nice to have them all in one place but i do understand it would be alot of work to go through and categorize them. Thank you anyways
Overall Rating -> 10
I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.
