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 |
34.34ct Black Star Sapphire, Oval, Opaque
20.2 x 16.8 mm
$ 444.63
13.03ct Brown Star Sunstone, Oval, Opaque
13 x 13 mm (calibrated)
$ 108.15
5.81ct Black Star Sapphire, Oval, Opaque
10.4 x 8.2 mm
$ 104.17
9.31ct Purple Star Ruby, Oval, Opaque
13 x 11 mm (calibrated)
$ 122.40
7.30ct Brown Star Moonstone, Oval, Translucent
14 x 10 mm (calibrated)
$ 31.99
44.94ct Yellow Star Sapphire, Oval, Opaque
23.3 x 19.7 mm
$ 402.84
3.28ctw Blue Star Sapphire, Oval, Opaque
7.3 x 5.3 mm
$ 62.62
12.31ctw Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 61.30
17.86ct Yellow Star Sapphire, Oval, Opaque
16 x 12 mm (calibrated)
$ 160.10
5.36ctw Blue Star Sapphire, Oval, Opaque
7.1 x 5.2 mm
$ 117.45
9.46ct Orange Star Moonstone, Oval, Translucent
15.6 x 10.4 mm
$ 41.45
3.53ct Red Star Ruby, Oval, Opaque
11.1 x 9.5 mm
$ 163.02
23.11ct Yellow Star Sapphire, Oval, Opaque
18.8 x 15.9 mm
$ 227.88
16.58ct Purple Star Ruby, Oval, Opaque
14.3 x 13 mm
$ 198.16
17.39ct Red Star Garnet, Oval, Opaque
17.5 x 12.2 mm
$ 17.15
3.92ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 85.90
5.51ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 27.44
3.60ct Red Star Ruby, Oval, Opaque
9.9 x 7.3 mm
$ 57.37
7.88ct Gray Star Sapphire, Oval, Opaque
10.6 x 10.2 mm
$ 302.17
17.08ct Red Star Garnet, Oval, Opaque
14.9 x 13.4 mm
$ 16.84
10.71ct Purple Star Ruby, Oval, Opaque
12 x 11 mm
$ 140.80
4.95ctw Blue Star Sapphire, Oval, Opaque
7 x 5.2 mm
$ 97.62
6.26ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 112.23
4.63ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 19.21
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 
Web site is very simple to navigate Selection is terrific
Overall Rating -> 10
Found a beautiful opal at a great price. I was not disappointed when it arrived. Even better in person.
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.
Overall Rating -> 10
They have a wonderful selection of gems of all sorts, shapes, cuts, and quality. I am very particular about the quality of stones I buy, and found many with VVS clarity and excellent cut and polish. I am thrilled with each of the stones I purchased, and would definitely recommend GemSelect to everyone.
Overall Rating -> 9 
I think therea's no problem
Overall Rating -> 10
My experience was done with ease
