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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (172): 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: 3858561 pcs
12.80ct Star Sapphire
14.20mm x 11.89mm x 6.25mm
USD 192.00
Item in Stock
ID: 4033101 pcs
24.71ct Star Moonstone
16.79mm x 12.70mm
USD 87.23
Item in Stock
ID: 3875311 pcs
5.78ct Star Sapphire
11.50mm x 9.19mm x 4.77mm
USD 115.60
Item in Stock
ID: 3858571 pcs
10.64ct Star Sapphire
14.30mm x 12.17mm x 5.37mm
USD 159.60
Item in Stock
ID: 3734601 pcs
55.45ct Star Lemon Quartz
22.47mm x 19.70mm x 16.95mm
USD 166.35
Item in Stock
ID: 2135221 pcs
19.71ct Star Moonstone
17.79mm x 9.36mm
USD 78.84
Item in Stock
ID: 4038911 pcs
80.78ct Star Garnet
24.38mm x 12.74mm
USD 242.34
Item in Stock
ID: 3906521 pcs
10.43ct Star Sapphire
13.19mm x 10.44mm x 6.57mm
USD 156.45
Item in Stock
ID: 4141891 pcs
3.76ct Star Moonstone
10.21mm x 8.17mm x 6.17mm
USD 15.04
Item in Stock
ID: 4141441 pcs
51.33ct Star Garnet
22.92mm x 19.10mm x 10.35mm
USD 153.99
Item in Stock
ID: 4141331 pcs
32.73ct Star Garnet
19.47mm x 16.24mm x 9.11mm
USD 98.19
Item in Stock
ID: 4038861 pcs
49.69ct Star Garnet
24.12mm x 8.42mm
USD 149.07
Item in Stock
ID: 4140121 pcs
5.92ct Star Moonstone
13.01mm x 10.45mm x 6.21mm
USD 23.68
Item in Stock
ID: 3506321 pcs
9.85ct Star Sapphire
12.69mm x 10.02mm x 6.72mm
USD 190.20
Item in Stock
ID: 3506551 pcs
8.00ct Star Sapphire
11.30mm x 9.95mm x 5.90mm
USD 154.48
Item in Stock
ID: 3547621 pcs
579.55ct Star Rose Quartz
57.01mm x 45.75mm x 34.63mm
USD 1159.10
Item in Stock
ID: 3052481 pcs
121.00ct Star Rose Quartz
28.56mm x 27.18mm x 21.31mm
USD 266.20
Item in Stock
ID: 4038851 pcs
49.87ct Star Garnet
22.50mm x 9.35mm
USD 149.61
Item in Stock
ID: 3875261 pcs
8.31ct Star Sapphire
13.25mm x 9.94mm x 5.87mm
USD 166.20
Item in Stock
ID: 4141471 pcs
40.47ct Star Garnet
20.27mm x 8.36mm
USD 121.41
Item in Stock
ID: 3506601 pcs
7.01ct Star Sapphire
12.44mm x 9.68mm x 5.17mm
USD 135.36
Item in Stock
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