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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (166): 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: 3734601 pcs
55.45ct Star Lemon Quartz
22.47 x 19.70 x 16.95mm
USD 166.35
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ID: 4141051 pcs
8.56ct Star Moonstone
12.68 x 10.21 x 8.39mm
USD 34.24
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ID: 3506551 pcs
8.00ct Star Sapphire
11.30 x 9.95 x 5.90mm
USD 154.48
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ID: 4141001 pcs
8.80ct Star Moonstone
13.89 x 9.58 x 8.54mm
USD 35.20
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ID: 3884001 pcs
10.12ct Star Sapphire
13.79 x 11.60 x 5.52mm
USD 164.35
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ID: 3875341 pcs
6.57ct Star Sapphire
11.79 x 8.72 x 5.93mm
USD 131.40
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ID: 3547641 pcs
270.20ct Star Rose Quartz
37.22 x 27.67mm
USD 540.40
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ID: 4033061 pcs
17.30ct Star Moonstone
19.41 x 15.76 x 8.22mm
USD 61.07
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ID: 4038881 pcs
65.99ct Star Garnet
22.85 x 11.66mm
USD 197.97
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ID: 4141031 pcs
7.70ct Star Moonstone
16.70 x 9.98 x 5.99mm
USD 30.80
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ID: 4140021 pcs
5.46ct Star Moonstone
12.43 x 9.68 x 6.24mm
USD 21.84
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ID: 4038891 pcs
62.40ct Star Garnet
24.34 x 9.79mm
USD 187.20
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ID: 4139691 pcs
16.54ct Star Moonstone
18.75 x 12.81 x 9.53mm
USD 66.16
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ID: 4040051 pcs
71.36ct Star Garnet
26.99 x 21.20 x 11.97mm
USD 214.08
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ID: 3858571 pcs
10.64ct Star Sapphire
14.30 x 12.17 x 5.37mm
USD 159.60
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ID: 3258111 pcs
20.62ct Star Moonstone
17.24 x 15.10 x 11.10mm
USD 82.48
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ID: 4038931 pcs
52.52ct Star Garnet
21.12 x 18.31 x 12.11mm
USD 157.56
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ID: 4029541 pcs
13.92ct Star Moonstone
17.13 x 13.21 x 8.72mm
USD 49.14
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ID: 3155201 pcs
13.78ct Star Moonstone
16.40 x 14.12 x 8.34mm
USD 55.12
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ID: 3861121 pcs
8.94ct Star Sapphire
12.48 x 9.46 x 6.48mm
USD 86.18
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ID: 4038941 pcs
43.01ct Star Garnet
22.23 x 19.80 x 9.42mm
USD 129.03
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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