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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Pairs |
Lots |
Faceted |
Cabochons |
3.21ct Medium Purple Star Ruby, Oval, Opaque
8.2 x 6.6 mm
$ 178.60
10.97ct Light Grey Star Sapphire, Round, Opaque
12 mm (calibrated)
$ 506.82
1.38ct Deep Blue Star Sapphire, Oval, Opaque
7.2 x 5.3 mm
$ 38.09
1.46ct Deep Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 40.30
14.31ct Medium-Dark Reddish Purple Star Ruby, Oval, Opaque
14.6 x 12.3 mm
$ 188.89
11.13ct Medium-Dark Purple Star Ruby, Oval, Opaque
14.3 x 10.6 mm
$ 176.30
3.16ct Black Star Sapphire, Oval, Opaque
9.5 x 6.9 mm
$ 68.26
8.90ct Medium-Dark Purple Star Ruby, Oval, Opaque
13 x 11 mm (calibrated)
$ 140.98
3.84ct Jam Red Star Ruby, Oval, Opaque
9.6 x 6.7 mm
$ 73.73
9.46ct Medium-Dark Orange Star Moonstone, Oval, Translucent
15.6 x 10.4 mm
$ 49.94
21.16ct Dark Red Star Garnet, Oval, Opaque
18 x 14 mm
$ 25.14
11.42ct Medium-Dark Purple Star Ruby, Oval, Opaque
13 x 10.6 mm
$ 180.89
4.25ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 21.25
4.24ctw Dark Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 100.74
4.17ctw Deep Navy Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 99.08
1.36ct Dark Blue Star Sapphire, Oval, Opaque
8 x 6 mm (calibrated)
$ 54.40
6.28ct Black Star Sapphire, Oval, Opaque
10.5 x 8.6 mm
$ 135.65
2.86ctw Dark Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 75.50
2.89ct Dark Blue Star Sapphire, Oval, Opaque
9 x 7 mm (calibrated)
$ 79.76
4.67ct Black Star Sapphire, Oval, Opaque
10.7 x 8.4 mm
$ 100.87
68.19ct Mahogany Red Star Garnet, Oval, Opaque
24.4 x 21.4 mm
$ 67.51
5.04ct Grayish Magenta Star Ruby, Oval, Opaque
9.4 x 8.5 mm
$ 96.77
12.20ct Mahogany Red Star Garnet, Oval, Opaque
16.6 x 13.6 mm
$ 14.50
27.24ct Medium-Dark Purple Star Ruby, Oval, Opaque
18.2 x 15.4 mm
$ 431.48
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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 
I have shopped at Gemselect for nearly 20 years. I especially like that you see pictures of the exact gem you are purchasing. You are a trusted source.
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
Excellent options
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 love the gems!
Overall Rating -> 10
I was looking for a site with every type of gem I could want for setting in luxury blades and assumed I would need to look outside the US, but GemSelect made it easy to get everything I wanted without leaving the house! Wide enough selection that I do not feel the need to look elsewhere and pricing the same.
