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 |
23.11ct Yellow Star Sapphire, Oval, Opaque
18.8 x 15.9 mm
$ 227.88
2.85ct Black Star Diopside, Baguette, Opaque
8 x 6 mm (calibrated)
$ 14.19
73.83ct Pink Star Rose Quartz, Oval, Transparent
24.6 x 23.1 mm
$ 121.35
3.92ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 85.90
8.96ct Gray Star Sapphire, Round, Opaque
10.5 mm
$ 312.35
4.38ct Black Star Sapphire, Oval, Opaque
10.6 x 8 mm
$ 78.53
2.74ct Black Star Sapphire, Oval, Opaque
8.2 x 6.8 mm
$ 190.34
3.36ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 73.62
2.50ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 54.78
5.32ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 22.08
12.04ctw Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 59.96
5.10ct Red Star Ruby, Oval, Opaque
10 x 8 mm (calibrated)
$ 81.27
5.51ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 27.44
6.52ct Black Star Sapphire, Oval, Opaque
11.8 x 9 mm
$ 108.23
3.31ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 72.53
25.89ct Purple Star Ruby, Oval, Opaque
17.9 x 15 mm
$ 340.38
3.82ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 75.34
2.97ct Black Star Sapphire, Oval, Opaque
9 x 7 mm (calibrated)
$ 44.37
7.78ct Purple Star Ruby, Oval, Opaque
12 x 10 mm (calibrated)
$ 92.98
4.24ct Red Star Ruby, Oval, Opaque
8.8 x 8.2 mm
$ 67.57
8.65ct Black Star Sapphire, Oval, Opaque
12.4 x 10.5 mm
$ 172.31
40.98ct Red Star Garnet, Round, Opaque
17 mm (calibrated)
$ 40.40
13.67ct Red Star Ruby, Oval, Opaque
14 x 12 mm (calibrated)
$ 179.72
5.23ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 114.60
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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 -> 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 
Good, hope gem quality is good and genuine
Overall Rating -> 10
Navigating the site was very easy and the photos of the exact gem you would be purchasing was well done.
Overall Rating -> 10
I liked the selection of gems, and price. I did not like your PayPal process. I already have a PP account and you want me to sign up for another.
Overall Rating -> 10
It was all good
Overall Rating -> 9 
I loved the selection of gemstones you have a to z
