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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (186): 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: 3258141 pcs
17.25ct Star Moonstone
17.86mm x 14.00mm x 9.45mm
USD 69.00
Item in Stock
ID: 4040061 pcs
91.05ct Star Garnet
28.41mm x 24.05mm x 12.47mm
USD 273.15
Item in Stock
ID: 4140401 pcs
24.90ct Star Garnet
17.72mm x 14.24mm x 8.80mm
USD 74.70
Item in Stock
ID: 4038921 pcs
40.30ct Star Garnet
21.29mm x 17.93mm x 9.62mm
USD 120.90
Item in Stock
ID: 4141941 pcs
10.34ct Star Moonstone
13.93mm x 10.54mm x 9.02mm
USD 41.36
Item in Stock
ID: 2709041 pcs
20.07ct Star Moonstone
17.95mm x 15.50mm x 10.05mm
USD 80.28
Item in Stock
ID: 4040051 pcs
71.36ct Star Garnet
26.99mm x 21.20mm x 11.97mm
USD 214.08
Item in Stock
ID: 3508861 pcs
7.96ct Star Sapphire
13.84mm x 10.58mm x 4.53mm
USD 153.71
Item in Stock
ID: 4140871 pcs
7.27ct Star Moonstone
11.37mm x 10.02mm x 8.24mm
USD 29.08
Item in Stock
ID: 3858521 pcs
13.93ct Star Sapphire
14.85mm x 11.74mm x 7.00mm
USD 208.95
Item in Stock
ID: 3906461 pcs
10.24ct Star Sapphire
13.09mm x 10.55mm x 6.39mm
USD 153.60
Item in Stock
ID: 4029541 pcs
13.92ct Star Moonstone
17.13mm x 13.21mm x 8.72mm
USD 49.14
Item in Stock
ID: 3801961 pcs
52.01ct Star Garnet
21.20mm x 17.93mm x 11.98mm
USD 260.05
Item in Stock
ID: 4141351 pcs
29.16ct Star Garnet
20.73mm x 17.19mm x 7.24mm
USD 87.48
Item in Stock
ID: 3444391 pcs
105.30ct Star Rose Quartz
30.43mm x 26.06mm x 18.75mm
USD 264.50
Item in Stock
ID: 3547631 pcs
382.95ct Star Rose Quartz
44.35mm x 42.53mm x 29.30mm
USD 765.90
Item in Stock
ID: 4040101 pcs
102.57ct Star Garnet
26.47mm x 13.33mm
USD 307.71
Item in Stock
ID: 2621091 pcs
15.93ct Star Moonstone
14.19mm x 13.36mm x 11.53mm
USD 63.72
Item in Stock
ID: 4140851 pcs
6.89ct Star Moonstone
12.32mm x 10.14mm x 7.37mm
USD 27.56
Item in Stock
ID: 3149961 pcs
150.25ct Star Rose Quartz
33.56mm x 29.50mm x 21.13mm
USD 300.50
Item in Stock
ID: 4141411 pcs
43.14ct Star Garnet
23.15mm x 18.96mm x 8.99mm
USD 129.42
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