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 |
4.90ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 96.63
17.03ct Purple Star Ruby, Oval, Opaque
16.2 x 13.4 mm
$ 223.90
8.06ct Black Star Diopside, Round, Opaque
12 mm (calibrated)
$ 40.14
30.08ct Yellow Star Sapphire, Oval, Opaque
18.7 x 16.4 mm
$ 296.60
6.06ct Red Star Ruby, Oval, Opaque
11.7 x 9.5 mm
$ 79.67
1.40ct Blue Star Sapphire, Oval, Opaque
8 x 6 mm (calibrated)
$ 46.48
10.31ctw Black Star Diopside, Oval, Opaque
11 x 9 mm (calibrated)
$ 51.34
8.53ct Purple Star Ruby, Oval, Opaque
12.7 x 10.4 mm
$ 112.15
6.00ct Black Star Diopside, Round, Opaque
11 mm (calibrated)
$ 29.88
5.97ct Black Star Sapphire, Oval, Opaque
11 x 9 mm (calibrated)
$ 118.92
8.80ct Gray Star Sapphire, Round, Opaque
11 mm (calibrated)
$ 306.77
2.46ct Black Star Diopside, Pear Shape, Opaque
10 x 7 mm (calibrated)
$ 12.25
3.22ct Purple Star Ruby, Oval, Opaque
8 x 8 mm (calibrated)
$ 149.67
1.56ct Black Star Diopside, Oval, Opaque
8 x 6 mm (calibrated)
$ 7.77
13.45ct Brown Star Sunstone, Oval, Opaque
16 x 12 mm (calibrated)
$ 111.64
4.05ct Purple Star Ruby, Oval, Translucent
8.3 x 7.4 mm
$ 44.37
9.87ct Red Star Garnet, Oval, Opaque
13.1 x 10.4 mm
$ 9.73
3.55ct Black Star Diopside, Round, Opaque
8 mm (calibrated)
$ 14.73
11.57ct Purple Star Ruby, Oval, Opaque
13.6 x 11.5 mm
$ 152.11
4.80ct Black Star Diopside, Round, Opaque
9 mm (calibrated)
$ 23.90
2.26ct Black Star Diopside, Oval, Opaque
8 x 6 mm (calibrated)
$ 11.25
5.39ct Red Star Ruby, Oval, Opaque
10.1 x 8.7 mm
$ 85.90
6.26ctw Blue Star Sapphire, Oval, Opaque
7 x 5 mm (calibrated)
$ 112.23
7.25ct Orange Star Moonstone, Oval, Translucent
15 x 10 mm (calibrated)
$ 31.77
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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 
Found a beautiful opal at a great price. I was not disappointed when it arrived. Even better in person.
Overall Rating -> 10
I loved it! Extensive inventory, great prices, I definitely will be buying from here again!
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
Easy process.
Overall Rating -> 9 
The purchasing process is fairly quick and straightforward and for me user friendly so it probably took more or less than 3 minutes to purchase and pay for the items. I wish there was a discount offer for multiple items to encourage us buyers to purchase more an incentive and add more sales in your end. Besides that, it's been a great purchasing experience and will continue to shop as I am a repeat customer and have bought from your store many times before. Thank you.
Overall Rating -> 9
It was fine . Wish there had been more round stones to select from
