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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (175): Star Cabochon Gemstones Star Sapphire, Star Ruby, Star Moonstone, Star Rose Quartz, Star Diopside, Star Sunstone, Star Garnet, Star Lemon Quartz Clear All
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ID: 3506381 pcs
6.35ct Star Sapphire
11.27mm x 8.59mm x 5.48mm
USD 122.62
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ID: 3508911 pcs
27.29ct Star Sapphire
19.39mm x 16.50mm x 7.09mm
USD 743.93
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ID: 3072781 pcs
20.45ct Star Moonstone
18.36mm x 12.54mm x 12.15mm
USD 81.80
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ID: 4040091 pcs
93.53ct Star Garnet
29.36mm x 24.28mm x 12.24mm
USD 280.59
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ID: 3506471 pcs
7.83ct Star Sapphire
13.77mm x 9.57mm x 5.11mm
USD 151.20
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ID: 3734531 pcs
83.68ct Star Lemon Quartz
24.71mm x 22.75mm x 19.35mm
USD 251.04
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ID: 4038901 pcs
73.16ct Star Garnet
23.31mm x 12.05mm
USD 219.48
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ID: 3506411 pcs
32.25ct Star Sapphire
18.37mm x 16.45mm x 8.83mm
USD 879.14
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ID: 4038851 pcs
49.87ct Star Garnet
22.50mm x 9.35mm
USD 149.61
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ID: 3858591 pcs
12.36ct Star Sapphire
14.05mm x 10.95mm x 6.82mm
USD 185.40
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ID: 3734541 pcs
85.89ct Star Lemon Quartz
24.98mm x 22.98mm x 19.88mm
USD 257.67
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ID: 4141041 pcs
7.34ct Star Moonstone
12.83mm x 9.35mm x 7.92mm
USD 29.36
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ID: 3861101 pcs
8.96ct Star Sapphire
12.85mm x 10.42mm x 5.81mm
USD 86.37
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ID: 3906531 pcs
5.61ct Star Sapphire
10.43mm x 7.77mm x 5.67mm
USD 84.15
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ID: 4141941 pcs
10.34ct Star Moonstone
13.93mm x 10.54mm x 9.02mm
USD 41.36
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ID: 3444411 pcs
132.70ct Star Rose Quartz
31.75mm x 27.37mm x 22.06mm
USD 331.75
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ID: 3861041 pcs
8.73ct Star Sapphire
12.44mm x 9.37mm x 6.31mm
USD 84.16
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ID: 3506421 pcs
32.66ct Star Sapphire
18.76mm x 14.98mm x 9.42mm
USD 890.31
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ID: 4141011 pcs
7.41ct Star Moonstone
14.19mm x 9.96mm x 6.93mm
USD 29.64
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ID: 3939711 pcs
6.82ct Star Sapphire
12.40mm x 9.35mm x 5.09mm
USD 58.79
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ID: 3072881 pcs
311.65ct Star Rose Quartz
43.53mm x 42.00mm x 24.42mm
USD 623.30
Item in Stock
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Star Cabochon Gemstones
In the world of gemstones, there is a small but special group of gems known to exhibit chatoyancy, either in the form of 'simple' chatoyancy, cat's eye chatoyancy or asterism (star chatoyancy). Gems that display the star effect are rare and fascinating. Chatoyancy is one of several forms of optical phenomena; other forms of optical phenomena include (but are not limited to) color-change, iridescence (the rainbow effect) and adularescence (shimmering light). Gems which display chatoyancy are known as 'phenomenal gemstones' and are heavily prized by jewelers and collectors for their rare and unique visible traits. The star phenomena is known to occur in only a handful of different gem types, such as star sapphire, star ruby, star garnet, star quartz, star moonstone and star diopside.

The value of star gemstones usually depends on the clarity of the 'star'. Gems which display sharp, clear and well-centered stars are generally considered to be of higher quality. In addition, gems which show stars from wider angles and under all different types of lighting are valued the most. Most star gemstones will often show their chatoyancy only when viewed under a single strong and focused light source; it is usually very difficult to see any asterism under diffused light. When viewing a star gemstone, it is best to use a flashlight or penlight while tilting the gem and light back and forth. This should cause the star to appear to glide across the stone's surface. Star gemstones are always cut en cabochon, as this is the best way to maximize chatoyancy. Gem cutters must be careful when working with star gemstones, as it requires great skill to properly shape and orient the stones.
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart