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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (187): 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: 3071711 pcs
17.55ct Star Moonstone
16.40mm x 12.72mm x 11.65mm
USD 70.20
Item in Stock
ID: 4141551 pcs
119.97ct Star Garnet
30.42mm x 25.56mm x 13.41mm
USD 359.91
Item in Stock
ID: 4141411 pcs
43.14ct Star Garnet
23.15mm x 18.96mm x 8.99mm
USD 129.42
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: 2231741 pcs
30.49ct Star Sapphire
18.85mm x 17.41mm x 7.76mm
USD 533.57
Item in Stock
ID: 4141541 pcs
113.94ct Star Garnet
28.67mm x 12.89mm
USD 341.82
Item in Stock
ID: 3884601 pcs
9.40ct Star Sapphire
12.90mm x 10.40mm x 5.67mm
USD 152.66
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: 4040101 pcs
102.57ct Star Garnet
26.47mm x 13.33mm
USD 307.71
Item in Stock
ID: 3508911 pcs
27.29ct Star Sapphire
19.39mm x 16.50mm x 7.09mm
USD 743.93
Item in Stock
ID: 4141921 pcs
8.39ct Star Moonstone
15.73mm x 10.74mm x 6.56mm
USD 33.56
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: 3506471 pcs
7.83ct Star Sapphire
13.77mm x 9.57mm x 5.11mm
USD 151.20
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: 3858501 pcs
13.08ct Star Sapphire
13.82mm x 11.12mm x 7.34mm
USD 196.20
Item in Stock
ID: 3072881 pcs
311.65ct Star Rose Quartz
43.53mm x 42.00mm x 24.42mm
USD 623.30
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: 3547611 pcs
499.60ct Star Rose Quartz
50.25mm x 44.90mm x 35.08mm
USD 999.20
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: 4141521 pcs
97.30ct Star Garnet
26.12mm x 12.55mm
USD 291.90
Item in Stock
ID: 3858591 pcs
12.36ct Star Sapphire
14.05mm x 10.95mm x 6.82mm
USD 185.40
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