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 |
3.34ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 65.87
3.84ct Red Star Ruby, Oval, Opaque
9.6 x 6.7 mm
$ 61.20
5.71ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 28.44
4.44ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 18.43
2.89ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 63.33
3.16ct Red Star Ruby, Oval, Opaque
10.6 x 8.1 mm
$ 50.36
6.34ct Red Star Ruby, Oval, Opaque
11.7 x 9 mm
$ 292.79
15.13ct Purple Star Ruby, Oval, Opaque
13 x 13 mm (calibrated)
$ 198.92
58.57ct Yellow Star Sapphire, Oval, Opaque
23.2 x 19.9 mm
$ 577.52
10.64ct Purple Star Ruby, Oval, Opaque
12 x 12 mm (calibrated)
$ 139.89
7.23ct Black Star Diopside, Round, Opaque
11 mm (calibrated)
$ 36.01
4.71ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 92.89
1.47ct Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 33.67
7.66ct Brown Star Moonstone, Oval, Translucent
15 x 10 mm (calibrated)
$ 33.57
18.06ct Purple Star Ruby, Oval, Opaque
17.1 x 14.2 mm
$ 237.44
7.54ct Black Star Diopside, Round, Opaque
11 mm (calibrated)
$ 37.55
5.87ctw Black Star Diopside, Round, Opaque
8 mm (calibrated)
$ 24.36
3.03ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 66.39
4.12ct Red Star Ruby, Oval, Opaque
9.4 x 8.4 mm
$ 65.65
6.01ct Black Star Diopside, Oval, Opaque
12 x 10 mm (calibrated)
$ 29.93
4.40ct Red Star Ruby, Oval, Opaque
10 x 8 mm (calibrated)
$ 70.12
12.00ctw Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 49.80
10.87ct Brown Star Sunstone, Oval, Opaque
16.1 x 12.8 mm
$ 90.22
20.21ct Purple Star Ruby, Oval, Opaque
16.2 x 13.9 mm
$ 265.70
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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 
All items were delivered on time with all items meeting or exceeding my expectations. Cut, clarity and color were very close to the photos and description.
Overall Rating -> 10
GemSelect offers excellent choices, prices & service- highly recommended! Unfortunately, prior to ordering a replacement gemstone, my jeweler neglected to mention it needed to be one that was a'cushion cuta' to fit the existing mount. Have yet to return/exchangea'
Overall Rating -> 10
I have been very happy with my prior purchases and enjoy the website experience.
Overall Rating -> 10
IT WAS GREAT SIMPLE I WAS ABLE TO MAKE AN ACCOUNT EASY AND WAS ABLE TO FAVORITE ALL OF MY FINAL SELECTED GEMS, I JUST LOVE IT.
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 -> 8
The website was easy to use and there were a lot of good options, I was satisfied.
