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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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 |
36.82ct Red Star Garnet, Oval, Opaque
21.3 x 17.4 mm
$ 43.74
5.16ct Yellow Star Moonstone, Oval, Translucent
14 x 10 mm (calibrated)
$ 24.77
4.94ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 130.42
4.05ct Purple Star Ruby, Oval, Translucent
8.3 x 7.4 mm
$ 53.46
5.39ct Red Star Ruby, Oval, Opaque
10.1 x 8.7 mm
$ 103.49
3.43ct Purple Star Ruby, Oval, Opaque
10 x 8 mm (calibrated)
$ 190.85
6.34ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 167.38
3.19ct Black Star Sapphire, Oval, Opaque
9.6 x 7.3 mm
$ 68.90
39.09ct Red Star Garnet, Oval, Opaque
19.8 x 16.6 mm
$ 46.44
11.87ct Purple Star Ruby, Oval, Opaque
14 x 12 mm (calibrated)
$ 188.02
2.45ct Black Star Sapphire, Oval, Opaque
8.5 x 6.2 mm
$ 52.92
13.70ct Purple Star Ruby, Oval, Opaque
14.9 x 12.6 mm
$ 217.01
2.37ct Black Star Diopside, Pear Shape, Opaque
10 x 7 mm (calibrated)
$ 14.22
25.89ct Purple Star Ruby, Oval, Opaque
17.9 x 15 mm
$ 410.10
4.34ct Purple Star Ruby, Oval, Opaque
10.2 x 7.7 mm
$ 241.48
12.41ct Red Star Garnet, Oval, Opaque
15.6 x 12.6 mm
$ 14.75
13.24ctw Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 66.20
6.77ct Brown Star Moonstone, Oval, Translucent
13.7 x 10.8 mm
$ 26.81
1.41ct Black Star Diopside, Oval, Opaque
8 x 6 mm (calibrated)
$ 8.46
20.70ct Brown Star Sunstone, Oval, Opaque
19 x 15.5 mm
$ 207.00
4.75ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 28.50
11.48ct Purple Star Ruby, Oval, Opaque
14.1 x 11.4 mm
$ 181.85
64.74ct Red Star Garnet, Oval, Opaque
25.7 x 21.4 mm
$ 80.80
9.06ct Black Star Diopside, Round, Opaque
11 mm (calibrated)
$ 54.36
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Why Buy Star Gemstones from GemSelect?
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- Supplying natural gemstones to jewelers and collectors in 120+ countries
- Verified natural gemstones
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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 always purchase my stones from GemSelect, their products are high quality and customer service is always great. I also like the fact that I am able to purchase unique items
Overall Rating -> 10
I was looking for high-quality amethyst on this site, and I was able to compare size, color, and weight in detail before making a purchase.
Overall Rating -> 9 
Very easy to navigate with a great selection.
Overall Rating -> 9
I was looking for a small gift for a friend- the process is the same as every other time and was very simple, and she even got her gift early! On the downside, there's no way to easily keep track of multiple Shipping Addresses, so if I want to send a gift to Friend A and to Friend B, I have to overwrite everything and it's a fair bit clunky in that regard.
Overall Rating -> 10
My experience has always been fantastic. Today I saved 6 gems to email a customer looking for a particular color blend to fit into an east west setting, so her options were limited, but we found one she wanted, deleted all the others in the cart and order the gem she selected. It was helpful to be able to put them in the cart so I could save them until she selected the one she wanted without having to research all of them again.
Overall Rating -> 10
I feel Gemselect is a trustworthy company to buy from
