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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (185): 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: 3884521 pcs
11.87ct Star Sapphire
13.23mm x 10.60mm x 7.33mm
USD 192.77
Item in Stock
ID: 4141931 pcs
8.60ct Star Moonstone
15.60mm x 9.90mm x 7.22mm
USD 34.40
Item in Stock
ID: 4038851 pcs
49.87ct Star Garnet
22.50mm x 9.35mm
USD 149.61
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: 4038891 pcs
62.40ct Star Garnet
24.34mm x 9.79mm
USD 187.20
Item in Stock
ID: 3153761 pcs
14.61ct Star Moonstone
13.47mm x 10.84mm
USD 58.44
Item in Stock
ID: 3153731 pcs
10.60ct Star Moonstone
13.86mm x 12.50mm x 9.08mm
USD 42.40
Item in Stock
ID: 4033101 pcs
24.71ct Star Moonstone
16.79mm x 12.70mm
USD 87.23
Item in Stock
ID: 4139751 pcs
11.25ct Star Moonstone
17.29mm x 11.44mm x 7.34mm
USD 45.00
Item in Stock
ID: 4040071 pcs
92.68ct Star Garnet
29.11mm x 23.96mm x 12.78mm
USD 278.04
Item in Stock
ID: 4140021 pcs
5.46ct Star Moonstone
12.43mm x 9.68mm x 6.24mm
USD 21.84
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: 3547621 pcs
579.55ct Star Rose Quartz
57.01mm x 45.75mm x 34.63mm
USD 1159.10
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: 3258141 pcs
17.25ct Star Moonstone
17.86mm x 14.00mm x 9.45mm
USD 69.00
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: 2231741 pcs
30.49ct Star Sapphire
18.85mm x 17.41mm x 7.76mm
USD 533.57
Item in Stock
ID: 4141011 pcs
7.41ct Star Moonstone
14.19mm x 9.96mm x 6.93mm
USD 29.64
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: 3734551 pcs
89.17ct Star Lemon Quartz
25.23mm x 23.98mm x 19.62mm
USD 267.51
Item in Stock
ID: 3906481 pcs
7.17ct Star Sapphire
12.55mm x 9.57mm x 5.22mm
USD 107.55
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