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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (188): 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: 3506401 pcs
32.74ct Star Sapphire
19.42mm x 16.43mm x 8.30mm
USD 892.49
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ID: 3149961 pcs
150.25ct Star Rose Quartz
33.56mm x 29.50mm x 21.13mm
USD 300.50
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ID: 4140041 pcs
4.90ct Star Moonstone
11.93mm x 9.62mm x 5.81mm
USD 19.60
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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: 4141551 pcs
119.97ct Star Garnet
30.42mm x 25.56mm x 13.41mm
USD 359.91
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ID: 4141521 pcs
97.30ct Star Garnet
26.12mm x 12.55mm
USD 291.90
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ID: 4141501 pcs
70.75ct Star Garnet
23.05mm x 11.89mm
USD 212.25
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ID: 4140911 pcs
6.00ct Star Moonstone
11.85mm x 9.82mm x 6.83mm
USD 24.00
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ID: 3547631 pcs
382.95ct Star Rose Quartz
44.35mm x 42.53mm x 29.30mm
USD 765.90
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ID: 3875331 pcs
6.66ct Star Sapphire
11.32mm x 8.78mm x 6.00mm
USD 133.20
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ID: 3506321 pcs
9.85ct Star Sapphire
12.69mm x 10.02mm x 6.72mm
USD 190.20
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ID: 3858531 pcs
8.71ct Star Sapphire
12.96mm x 10.14mm x 5.70mm
USD 130.65
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ID: 2621091 pcs
15.93ct Star Moonstone
14.19mm x 13.36mm x 11.53mm
USD 63.72
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ID: 4038881 pcs
65.99ct Star Garnet
22.85mm x 11.66mm
USD 197.97
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ID: 2231741 pcs
30.49ct Star Sapphire
18.85mm x 17.41mm x 7.76mm
USD 533.57
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ID: 4033061 pcs
17.30ct Star Moonstone
19.41mm x 15.76mm x 8.22mm
USD 61.07
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ID: 3858521 pcs
13.93ct Star Sapphire
14.85mm x 11.74mm x 7.00mm
USD 208.95
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ID: 4038841 pcs
56.50ct Star Garnet
20.85mm x 12.22mm
USD 169.50
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ID: 4029591 pcs
16.35ct Star Moonstone
18.03mm x 13.12mm x 10.02mm
USD 57.72
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ID: 4141361 pcs
30.03ct Star Garnet
20.92mm x 16.91mm x 7.48mm
USD 90.09
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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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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