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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: 3906511 pcs
6.38ct Star Sapphire
11.56mm x 9.14mm x 5.29mm
USD 95.70
Item in Stock
ID: 3858581 pcs
9.82ct Star Sapphire
12.09mm x 10.78mm x 6.37mm
USD 147.30
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: 3884601 pcs
9.40ct Star Sapphire
12.90mm x 10.40mm x 5.67mm
USD 152.66
Item in Stock
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ID: 4180321 pcs
97.90ct Star Garnet
24.73mm x 22.00mm x 15.91mm
USD 489.50
Item in Stock
ID: 4038881 pcs
65.99ct Star Garnet
22.85mm x 11.66mm
USD 197.97
Item in Stock
ID: 3734541 pcs
85.89ct Star Lemon Quartz
24.98mm x 22.98mm x 19.88mm
USD 257.67
Item in Stock
ID: 3861101 pcs
8.96ct Star Sapphire
12.85mm x 10.42mm x 5.81mm
USD 86.37
Item in Stock
ID: 4040091 pcs
93.53ct Star Garnet
29.36mm x 24.28mm x 12.24mm
USD 280.59
Item in Stock
ID: 3153761 pcs
14.61ct Star Moonstone
13.47mm x 10.84mm
USD 58.44
Item in Stock
ID: 4038901 pcs
73.16ct Star Garnet
23.31mm x 12.05mm
USD 219.48
Item in Stock
ID: 2135191 pcs
22.41ct Star Moonstone
16.50mm x 11.78mm
USD 89.64
Item in Stock
ID: 4139731 pcs
8.03ct Star Moonstone
18.13mm x 11.05mm x 5.28mm
USD 32.12
Item in Stock
ID: 3875341 pcs
6.57ct Star Sapphire
11.79mm x 8.72mm x 5.93mm
USD 131.40
Item in Stock
ID: 3861021 pcs
9.74ct Star Sapphire
13.78mm x 10.16mm x 5.79mm
USD 93.89
Item in Stock
ID: 4031961 pcs
13.75ct Star Moonstone
15.92mm x 11.76mm x 11.08mm
USD 48.54
Item in Stock
ID: 4141001 pcs
8.80ct Star Moonstone
13.89mm x 9.58mm x 8.54mm
USD 35.20
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: 4139671 pcs
12.79ct Star Moonstone
15.93mm x 13.43mm x 8.27mm
USD 51.16
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: 4141441 pcs
51.33ct Star Garnet
22.92mm x 19.10mm x 10.35mm
USD 153.99
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