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 Star Gemstones
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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 |
6.70ct Medium Dark Reddish-Purple Star Ruby, Oval, Opaque
11.6 x 9.4 mm
$ 372.79
5.11ct Black Star Diopside, Oval, Opaque
10.1 x 8.9 mm
$ 25.55
6.06ct Medium Red Star Ruby, Oval, Opaque
11.7 x 9.5 mm
$ 95.99
4.91ct Black Star Sapphire, Oval, Opaque
9.8 x 7.5 mm
$ 106.06
4.44ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 22.20
3.66ct Jam Red Star Ruby, Oval, Opaque
9.3 x 8.1 mm
$ 70.27
12.09ctw Black Star Diopside, Oval, Opaque
12.3 x 9.1 mm
$ 60.45
5.17ct Black Star Sapphire, Oval, Opaque
10 x 8 mm (calibrated)
$ 111.67
7.16ct Medium-Light Brown Star Moonstone, Oval, Translucent
14 x 10 mm (calibrated)
$ 37.80
6.08ct Raspberry Red Star Ruby, Oval, Opaque
10 x 8.6 mm
$ 96.31
1.47ct Black Star Diopside, Oval, Opaque
8 x 6 mm (calibrated)
$ 8.82
3.81ctw Dark Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 90.53
2.11ct Black Star Diopside, Oval, Opaque
8 x 6 mm (calibrated)
$ 12.66
4.24ct Deep Crimson Star Ruby, Oval, Opaque
8.8 x 8.2 mm
$ 81.41
3.20ct Deep Red Star Ruby, Oval, Opaque
9.7 x 7.6 mm
$ 178.05
5.83ct Light Yellow Star Moonstone, Oval, Translucent
13.2 x 10.6 mm
$ 30.78
3.19ct Jam Red Star Ruby, Oval, Opaque
9.5 x 6.9 mm
$ 61.25
6.80ct Medium-Dark Purple Star Ruby, Oval, Opaque
12 x 10 mm (calibrated)
$ 107.71
24.49ct Medium-Dark Purple Star Ruby, Oval, Opaque
16.5 x 15 mm
$ 387.92
4.13ct Medium Red Star Ruby, Oval, Opaque
7.9 x 7.2 mm
$ 79.30
8.51ct Yellowish Brown Star Moonstone, Oval, Translucent
12.7 x 10.2 mm
$ 33.70
4.02ct Reddish Purple Star Ruby, Oval, Opaque
8.5 x 7.6 mm
$ 223.67
1.58ct Navy Blue Star Sapphire, Oval, Opaque
7.2 x 5.2 mm
$ 39.62
6.74ct Wine Red Star Ruby, Oval, Opaque
9.6 x 8.7 mm
$ 97.06
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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 -> 8 
I visited several online loose stone shops trying to find rare stones. I finally found one that I've been looking for here, and very satisfied. Looking forward to receive the item in 3 weeks.
Overall Rating -> 10 
When I need a specific stone, gem select is my go to shop. Always a good experience and a great product.
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 -> 9 
I wish there were options for jewelry settings
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
My experience was done with ease
