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 |
4.75ct Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 23.66
4.42ct Red Star Ruby, Pear Shape, Opaque
9.2 x 8.4 mm
$ 70.43
5.51ct Orange Star Moonstone, Oval, Translucent
13.4 x 8.1 mm
$ 24.14
6.87ct Purple Star Ruby, Oval, Opaque
12 x 10 mm (calibrated)
$ 90.32
10.95ct Black Star Diopside, Round, Opaque
12 mm (calibrated)
$ 54.53
7.66ct Brown Star Moonstone, Oval, Translucent
15 x 10 mm (calibrated)
$ 33.57
4.70ct Black Star Sapphire, Oval, Opaque
10.5 x 8.4 mm
$ 84.26
579.55ct Pink Star Rose Quartz, Oval, Transparent/Translucent
57 x 45.8 mm
$ 1,058.26
3.34ct Black Star Sapphire, Oval, Opaque
9.7 x 7.4 mm
$ 59.88
6.54ct Black Star Sapphire, Oval, Opaque
10.7 x 8.4 mm
$ 130.28
6.02ct Red Star Ruby, Round, Opaque
9.5 mm (calibrated)
$ 278.01
4.45ct Purple Star Ruby, Oval, Opaque
10.3 x 8.6 mm
$ 70.92
1.49ct Blue Star Sapphire, Oval, Opaque
7.1 x 5.3 mm
$ 34.13
4.35ct Black Star Sapphire, Oval, Opaque
10.4 x 8.6 mm
$ 77.99
3.10ctw Blue Star Sapphire, Oval, Opaque
7 x 5.3 mm
$ 71.01
1.56ct Black Star Diopside, Oval, Opaque
8 x 6 mm (calibrated)
$ 7.77
7.28ct Purple Star Ruby, Oval, Opaque
12.8 x 10.7 mm
$ 95.72
7.82ct Brown Star Sunstone, Oval, Opaque
15 x 10 mm (calibrated)
$ 64.91
5.96ct Red Star Ruby, Oval, Opaque
8.7 x 7.7 mm
$ 94.98
4.82ct Black Star Sapphire, Oval, Opaque
11.6 x 8.8 mm
$ 96.01
31.95ct Yellow Star Sapphire, Oval, Opaque
19.8 x 16.9 mm
$ 315.04
7.89ct Brown Star Moonstone, Oval, Translucent
13.8 x 11.3 mm
$ 34.58
9.87ct Purple Star Ruby, Oval, Opaque
11.4 x 10.5 mm
$ 455.81
2.19ct Black Star Diopside, Round, Opaque
7.5 mm (calibrated)
$ 10.91
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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 
Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.
Overall Rating -> 10
Although the stones are smaller than I thought, I really don't think in millimeters, they are perfect. I plan to put one into a ring and the other into a necklace. Ordering was easy, contact kept me aware of how shipping was going, and delivery was sooner than expected. The quality of stones I have ordered in the past and this recent order is outstanding and stones I will be proud to wear.
Overall Rating -> 10
All good
Overall Rating -> 10
Excellent options
Overall Rating -> 10
Enjoy every moment
Overall Rating -> 10
I purchased 4 gemstones in different sizes to be able to make a family ring for my granddaughter. I got exactly what I saw and they are absolutely beautiful! Shipping was quick compared to other gem stores I have dealt with! I will definitely order more stones from your company, as I am a collector and have several stones. You are my new go to company in the future
