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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (122): Star Cabochons 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: 4141921 pcs
thumb image of 8.4ct Oval Cabochon Cream Peach Star Moonstone (ID: 414192)
8.39 ct Star Moonstone
15.7 x 10.7 mm
$ 33.56
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ID: 3153731 pcs
thumb image of 10.6ct Oval Cabochon Cream Star Moonstone (ID: 315373)
10.60 ct Star Moonstone
13.9 x 12.5 mm
$ 42.40
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ID: 4031911 pcs
thumb image of 14.9ct Oval Cabochon Cream Star Moonstone (ID: 403191)
14.92 ct Star Moonstone
15.7 x 12.7 mm
$ 52.67
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ID: 3053791 pcs
thumb image of 163.2ct Oval Cabochon Pink Star Rose Quartz (ID: 305379)
163.20 ct Star Rose Quartz
32.1 x 28.8 mm
$ 326.40
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ID: 4038911 pcs
thumb image of 80.8ct Round Cabochon Black Red Star Garnet (ID: 403891)
80.78 ct Star Garnet
24.4 mm
$ 242.34
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ID: 3906501 pcs
thumb image of 9.9ct Oval Cabochon Black Star Sapphire (ID: 390650)
9.89 ct Star Sapphire
14.2 x 11.9 mm
$ 148.35
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ID: 3734521 pcs
thumb image of 84.6ct Oval Cabochon Lemon Star Lemon Quartz (ID: 373452)
84.63 ct Star Lemon Quartz
25.2 x 22.5 mm
$ 253.89
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ID: 3258021 pcs
thumb image of 67ct Oval Cabochon Reddish Black Star Garnet (ID: 325802)
66.95 ct Star Garnet
21.8 x 18.6 mm
$ 334.75
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ID: 4040061 pcs
thumb image of 91.1ct Oval Cabochon Black Red Star Garnet (ID: 404006)
91.05 ct Star Garnet
28.4 x 24.1 mm
$ 273.15
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ID: 3506401 pcs
thumb image of 32.7ct Oval Cabochon Black Star Sapphire (ID: 350640)
32.74 ct Star Sapphire
19.4 x 16.4 mm
$ 655.75
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ID: 3875331 pcs
thumb image of 6.7ct Oval Cabochon Black Star Sapphire (ID: 387533)
6.66 ct Star Sapphire
11.3 x 8.8 mm
$ 99.99
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ID: 4140011 pcs
thumb image of 6ct Oval Cabochon Cream Star Moonstone (ID: 414001)
5.96 ct Star Moonstone
13.2 x 9.7 mm
$ 23.84
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ID: 3508841 pcs
thumb image of 10.5ct Oval Cabochon Black Star Sapphire (ID: 350884)
10.52 ct Star Sapphire
13.9 x 10.9 mm
$ 203.14
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ID: 4180321 pcs
thumb image of 97.9ct Oval Cabochon Black Red Star Garnet (ID: 418032)
97.90 ct Star Garnet
24.7 x 22 mm
$ 489.50
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ID: 3506591 pcs
thumb image of 6.2ct Oval Cabochon Black Star Sapphire (ID: 350659)
6.22 ct Star Sapphire
12.6 x 8.5 mm
$ 93.30
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ID: 4038921 pcs
thumb image of 40.3ct Oval Cabochon Black Red Star Garnet (ID: 403892)
40.30 ct Star Garnet
21.3 x 17.9 mm
$ 120.90
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ID: 3258111 pcs
thumb image of 20.6ct Oval Cabochon Cream Star Moonstone (ID: 325811)
20.62 ct Star Moonstone
17.2 x 15.1 mm
$ 82.48
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Star Cabochons
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