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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: 3861021 pcs
9.74ct Star Sapphire
13.78mm x 10.16mm x 5.79mm
USD 93.89
Item in Stock
ID: 3547641 pcs
270.20ct Star Rose Quartz
37.22mm x 27.67mm
USD 540.40
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: 3885381 pcs
6.32ct Star Sapphire
14.65mm x 11.58mm x 3.20mm
USD 150.54
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: 3506381 pcs
6.35ct Star Sapphire
11.27mm x 8.59mm x 5.48mm
USD 122.62
Item in Stock
ID: 3052491 pcs
156.55ct Star Rose Quartz
32.05mm x 28.33mm x 23.24mm
USD 344.41
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: 4140941 pcs
6.47ct Star Moonstone
10.90mm x 9.86mm x 7.89mm
USD 25.88
Item in Stock
ID: 3547651 pcs
200.00ct Star Rose Quartz
34.83mm x 23.58mm
USD 400.00
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: 2888231 pcs
26.52ct Star Garnet
15.06mm x 9.94mm
USD 132.60
Item in Stock
ID: 4140451 pcs
29.48ct Star Garnet
19.21mm x 15.16mm x 8.94mm
USD 88.44
Item in Stock
ID: 3861121 pcs
8.94ct Star Sapphire
12.48mm x 9.46mm x 6.48mm
USD 86.18
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: 4029541 pcs
13.92ct Star Moonstone
17.13mm x 13.21mm x 8.72mm
USD 49.14
Item in Stock
ID: 3444381 pcs
236.30ct Star Rose Quartz
38.16mm x 36.21mm x 25.38mm
USD 590.75
Item in Stock
ID: 4038871 pcs
60.59ct Star Garnet
23.75mm x 10.29mm
USD 181.77
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: 4141941 pcs
10.34ct Star Moonstone
13.93mm x 10.54mm x 9.02mm
USD 41.36
Item in Stock
ID: 2135191 pcs
22.41ct Star Moonstone
16.50mm x 11.78mm
USD 89.64
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