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 |
9.87ct Medium Dark-Purple Star Ruby, Oval, Opaque
11.4 x 10.5 mm
$ 549.17
6.04ctw Dark Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 159.46
6.00ct Black Star Diopside, Round, Opaque
11 mm (calibrated)
$ 36.00
16.49ct Medium-Light Purple Star Ruby, Oval, Opaque
15.8 x 13.6 mm
$ 261.20
21.95ct Medium-Dark Purple Star Ruby, Oval, Opaque
16.1 x 14.5 mm
$ 347.69
5.27ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 26.35
6.72ct Light Yellow Star Moonstone, Oval, Translucent
15.7 x 10.4 mm
$ 35.48
7.08ct Black Star Diopside, Oval, Opaque
12 x 10 mm (calibrated)
$ 42.48
76.64ct Mahogany Red Star Garnet, Oval, Opaque
26.1 x 22.7 mm
$ 91.04
1.82ct Black Star Diopside, Oval, Opaque
9 x 6.6 mm
$ 9.10
4.43ct Black Star Diopside, Oval, Opaque
12 x 10 mm (calibrated)
$ 26.58
4.61ctw Deep Navy Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 121.70
15.06ct Plum Purple Star Ruby, Oval, Opaque
16.1 x 11.3 mm
$ 376.50
3.43ctw Deep Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 81.49
4.01ct Black Star Sapphire, Pear Shape, Opaque
11 x 7.9 mm
$ 86.62
4.26ct Black Star Sapphire, Oval, Opaque
10.7 x 8.3 mm
$ 76.68
6.37ct Light Brown Star Moonstone, Oval, Translucent
13.9 x 10.9 mm
$ 33.64
4.46ct Navy Blue Star Sapphire, Round, Opaque
9.5 mm (calibrated)
$ 117.74
57.48ct Mahogany Red Star Garnet, Oval, Opaque
24.4 x 20.4 mm
$ 227.62
4.29ctw Deep Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 101.93
11.62ct Dark Red Star Garnet, Oval, Opaque
13 x 11 mm (calibrated)
$ 13.80
4.94ctw Deep Navy Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 130.42
3.64ct Black Star Sapphire, Oval, Opaque
9.1 x 8.4 mm
$ 78.62
10.64ct Reddish Purple Star Ruby, Oval, Opaque
12 x 12 mm (calibrated)
$ 168.54
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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 
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
Great experience. I can't wait to explore on the website further.
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
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 -> 10
All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.
Overall Rating -> 10
Was a good experience.
