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Home / Gem Library / Gemstones Varieties / Star Sapphire April 20, 2024

Natural Star Sapphire

Sapphires that display asterism are known as "stars" in the trade. Cabochon-cut star sapphires characteristically shows a six-rayed star. Although stars can occur in a range of colors many stars are grayish or dark and the supply of fine stones is always limited. Black star sapphires which range from translucent to opaque are often very dark brown, green, or blue, rather than true black. Black stars are the most available and least expensive, natural star stones and are especially popular in gents rings. Green star sapphires are rare and yellow or orange ones are very rare. The star is a result of the light reflecting of off of the silky crystallizations of rutile inside the stone.

  • There are 12 Star Sapphire gemstones available at
  • Star Sapphire(s) are organized in the following categories: Closeout,  gemstones.
  • Our most expensive Star Sapphire is USD 217.87 and largest Star Sapphire weight is CTS 60.52.
  • Our cheapest Star Sapphire is USD 82.48 and smallest Star Sapphire weight is CTS 22.91.

Find your Star Sapphire

Our Star Sapphire(s) are available in various shapes, sizes and colors. 12 Star Sapphire(s), too many to look through? You may select any combination of search options. Colors grade into each other and you can search for more than one color at once. For a better selection, try selecting two or three colors, -- your first choice plus the two closest colors.

Color range

Star Sapphire Profile

Color information: Blue, green blue, violet, blue, black, brown, pink.
Refractive Index: 1.759-1.778
Chemical Composition: AL2O3
Hardness: 9
Density: 4.00
Crystal Group: Hexagonal
Ocurrence: Sri Lanka, Burma, India, East Africa, Ankarana-Madagascar, Thailand, Vietnam.
Sign of the Zodiac: N/A
Month of the year: N/A
Star Sapphire Star Sapphire
Modern heat treatments that remove the silky rutile inclusions improve clarity but at the same time remove the asterism because it is the silky material which is responsible for the asterism and without the silk, there are no stars. Clean stars do not exist! Marketed stars typically range from 1 - 10cts. in size but some stones are much larger. The American Museum of Natural History's collection includes one of the world's largest and most spectacular blue sapphires- the 153ct. Star of India.

Madagascar star sapphires from Ankarana can be very large and frequently display excellent asterism. We photograph our stars with a fiber optic light above the stone and the effect is similar to direct sunlight or a spotlight. The denim blue color of Madagascar Star Sapphires can be quite even except for the crystal growth lines which prove that the stone is natural.

In terms of price and quality, blue star sapphires from Madagascar are incomparable in value. Ceylon and Burma both produce limited quantities of blue stars but although some are better in quality, their prices are normally substantially higher.

Some traditions say that the star sapphire is a stone of destiny, and that its star acts as a guiding light and protects its wearer against evil. To medieval Christians, the three intersecting bands that form the star represented the spiritual virtues of Faith, Hope, and Charity, Today star sapphire provides a phenomenal September birthstone alternative.

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Star Sapphire range/
Star Sapphire Closeout
Star Sapphire Closeout Oval Opaque
Weight: 60.520 CTS
Shape: Oval
Clarity: Opaque
Usually ships within 24 hours
USD 217.87
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Star Sapphire Closeout
Star Sapphire Closeout Oval Opaque
Weight: 22.910 CTS
Shape: Oval
Clarity: Opaque
Usually ships within 24 hours
USD 82.48
Add to Shopping Cart Save For Later

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