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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (175): 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: 4139671 pcs
12.79ct Star Moonstone
15.93mm x 13.43mm x 8.27mm
USD 51.16
Item in Stock
ID: 3053791 pcs
163.20ct Star Rose Quartz
32.07mm x 28.75mm x 23.21mm
USD 326.40
Item in Stock
ID: 3734521 pcs
84.63ct Star Lemon Quartz
25.18mm x 22.54mm x 19.54mm
USD 253.89
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: 3883991 pcs
9.60ct Star Sapphire
13.18mm x 9.80mm x 6.50mm
USD 155.90
Item in Stock
ID: 4140461 pcs
30.14ct Star Garnet
17.24mm x 9.04mm
USD 90.42
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: 4139701 pcs
17.15ct Star Moonstone
17.14mm x 13.65mm x 10.26mm
USD 68.60
Item in Stock
ID: 4141421 pcs
45.93ct Star Garnet
20.79mm x 18.14mm x 10.60mm
USD 137.79
Item in Stock
ID: 4140041 pcs
4.90ct Star Moonstone
11.93mm x 9.62mm x 5.81mm
USD 19.60
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: 4038931 pcs
52.52ct Star Garnet
21.12mm x 18.31mm x 12.11mm
USD 157.56
Item in Stock
ID: 2135221 pcs
19.71ct Star Moonstone
17.79mm x 9.36mm
USD 78.84
Item in Stock
ID: 4038941 pcs
43.01ct Star Garnet
22.23mm x 19.80mm x 9.42mm
USD 129.03
Item in Stock
ID: 3506421 pcs
32.66ct Star Sapphire
18.76mm x 14.98mm x 9.42mm
USD 890.31
Item in Stock
ID: 3734611 pcs
78.67ct Star Lemon Quartz
24.09mm x 22.70mm x 19.18mm
USD 236.01
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: 3906501 pcs
9.89ct Star Sapphire
14.18mm x 11.91mm x 4.84mm
USD 148.35
Item in Stock
ID: 3256251 pcs
31.18ct Star Garnet
17.50mm x 14.10mm x 11.31mm
USD 155.90
Item in Stock
ID: 3506591 pcs
6.22ct Star Sapphire
12.64mm x 8.53mm x 5.14mm
USD 120.11
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
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