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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (117): Star 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: 4625971 pcs
thumb image of 1.4ct Oval Cabochon Black Star Sapphire (ID: 462597)
1.39 ct Star Sapphire
7.9 x 6 mm
$ 21.07
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ID: 4141411 pcs
thumb image of 43.1ct Oval Cabochon Black Red Star Garnet (ID: 414141)
43.14 ct Star Garnet
23.2 x 19 mm
$ 129.42
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ID: 3801961 pcs
thumb image of 52ct Oval Cabochon Reddish Black Star Garnet (ID: 380196)
52.01 ct Star Garnet
21.2 x 17.9 mm
$ 260.05
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ID: 3508921 pcs
thumb image of 20.3ct Oval Cabochon Black Star Sapphire (ID: 350892)
20.32 ct Star Sapphire
19.2 x 15.9 mm
$ 553.92
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ID: 2231741 pcs
thumb image of 30.5ct Oval Cabochon Black Star Sapphire (ID: 223174)
30.49 ct Star Sapphire
18.9 x 17.4 mm
$ 533.57
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ID: 4625981 pcs
thumb image of 1.1ct Oval Cabochon Blue Star Sapphire (ID: 462598)
1.11 ct Star Sapphire
7.1 x 5.5 mm
$ 13.46
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ID: 4038941 pcs
thumb image of 43ct Oval Cabochon Black Red Star Garnet (ID: 403894)
43.01 ct Star Garnet
22.2 x 19.8 mm
$ 129.03
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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: 3858591 pcs
thumb image of 12.4ct Oval Cabochon Black Star Sapphire (ID: 385859)
12.36 ct Star Sapphire
14.1 x 11 mm
$ 185.40
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ID: 4038861 pcs
thumb image of 49.7ct Round Cabochon Black Red Star Garnet (ID: 403886)
49.69 ct Star Garnet
24.1 mm
$ 149.07
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ID: 4141471 pcs
thumb image of 40.5ct Round Cabochon Black Red Star Garnet (ID: 414147)
40.47 ct Star Garnet
20.3 mm
$ 121.41
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ID: 4139751 pcs
thumb image of 11.3ct Oval Cabochon Smoke Star Moonstone (ID: 413975)
11.25 ct Star Moonstone
17.3 x 11.4 mm
$ 45.00
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ID: 4040071 pcs
thumb image of 92.7ct Oval Cabochon Black Red Star Garnet (ID: 404007)
92.68 ct Star Garnet
29.1 x 24 mm
$ 278.04
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ID: 4141491 pcs
thumb image of 72ct Oval Cabochon Black Red Star Garnet (ID: 414149)
71.96 ct Star Garnet
24.7 x 20.1 mm
$ 215.88
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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: 4141511 pcs
thumb image of 38.7ct Round Cabochon Black Red Star Garnet (ID: 414151)
38.73 ct Star Garnet
20.5 mm
$ 116.19
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ID: 4040091 pcs
thumb image of 93.5ct Oval Cabochon Black Red Star Garnet (ID: 404009)
93.53 ct Star Garnet
29.4 x 24.3 mm
$ 280.59
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ID: 4040081 pcs
thumb image of 93.1ct Oval Cabochon Black Red Star Garnet (ID: 404008)
93.06 ct Star Garnet
29.2 x 25.6 mm
$ 279.18
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ID: 4141391 pcs
thumb image of 38.2ct Oval Cabochon Black Red Star Garnet (ID: 414139)
38.23 ct Star Garnet
21.3 x 17 mm
$ 114.69
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ID: 4141521 pcs
thumb image of 97.3ct Round Cabochon Black Red Star Garnet (ID: 414152)
97.30 ct Star Garnet
26.1 mm
$ 291.90
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ID: 4040051 pcs
thumb image of 71.4ct Oval Cabochon Black Red Star Garnet (ID: 404005)
71.36 ct Star Garnet
27 x 21.2 mm
$ 214.08
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Star 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