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 |
9.38ct Reddish Purple Star Ruby, Oval, Opaque
13.2 x 10.4 mm
$ 148.58
4.34ct Medium Dark-Purple Star Ruby, Oval, Opaque
10.2 x 7.7 mm
$ 241.48
4.24ct Navy Blue Star Sapphire, Round, Opaque
9 mm (calibrated)
$ 111.94
3.95ct Black Star Sapphire, Pear Shape, Opaque
10 x 8.4 mm
$ 85.32
15.48ct Black Star Sapphire, Oval, Opaque
13.9 x 13.4 mm
$ 241.49
1.44ct Black Star Diopside, Oval, Opaque
8 x 6 mm (calibrated)
$ 8.64
11.67ct Mahogany Red Star Garnet, Round, Opaque
12 mm (calibrated)
$ 13.86
1.98ct Black Star Sapphire, Oval, Opaque
9 x 7 mm (calibrated)
$ 35.64
69.04ct Mahogany Red Star Garnet, Oval, Opaque
27.5 x 22.2 mm
$ 82.02
0.68ct Night Blue Star Sapphire, Oval, Opaque
5.2 x 4.2 mm
$ 27.20
10.00ct Medium-Dark Purple Star Ruby, Oval, Opaque
13 x 11 mm (calibrated)
$ 158.40
3.74ct Medium Red Star Ruby, Oval, Opaque
8.6 x 7.8 mm
$ 71.81
14.01ct Dark Red Star Garnet, Oval, Opaque
16.3 x 11.4 mm
$ 17.48
15.00ct Medium-Dark Purple Star Ruby, Oval, Opaque
16.2 x 13.4 mm
$ 237.60
5.45ct Black Star Diopside, Oval, Opaque
12 x 10 mm (calibrated)
$ 32.70
1.85ct Dark Blue Star Sapphire, Oval, Opaque
8 x 6 mm (calibrated)
$ 74.00
5.13ctw Deep Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 121.88
13.70ct Medium-Dark Purple Star Ruby, Oval, Opaque
14.9 x 12.6 mm
$ 217.01
4.05ct Magenta-Pink Star Ruby, Oval, Translucent
8.3 x 7.4 mm
$ 53.46
37.81ct Dark Red Star Garnet, Oval, Opaque
21 x 16.6 mm
$ 44.92
5.37ctw Deep Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 127.60
12.00ctw Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 60.00
22.94ct Wine Red Star Ruby, Oval, Opaque
17.3 x 14.7 mm
$ 363.37
5.50ct Black Star Sapphire, Oval, Opaque
11 x 9 mm (calibrated)
$ 132.00
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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 -> 10 
Have made 2 purchases so far from GemSelect and they have been amazing! Anytime I requested additional info, videos or pictures of a particular item, the response was always timely and helpful. This is a great place to buy, if you are looking for loose stones. Highly recommend!
Overall Rating -> 10
The website has a good selection, the interface is very intuitive.
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
Loved the price and the quality and the certification options which is the main reason why I buy. The guarantee is also a great reason to use gem select.
Overall Rating -> 10
It was easy to navigate
Overall Rating -> 10
Very food
