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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (169): Star Cabochons 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: 3153761 pcs
thumb image of 14.6ct Round Cabochon Smoke Star Moonstone (ID: 315376)
14.61ct Star Moonstone
13.47 x 10.84mm
USD 58.44
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ID: 2231741 pcs
thumb image of 30.5ct Oval Cabochon Black Star Sapphire (ID: 223174)
30.49ct Star Sapphire
18.85 x 17.41 x 7.76mm
USD 533.57
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ID: 3876811 pcs
thumb image of 4.6ct Oval Cabochon Black Star Sapphire (ID: 387681)
4.58ct Star Sapphire
11.79 x 8.90 x 3.92mm
USD 91.60
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ID: 3258141 pcs
thumb image of 17.3ct Oval Cabochon Cream Star Moonstone (ID: 325814)
17.25ct Star Moonstone
17.86 x 14.00 x 9.45mm
USD 69.00
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ID: 3801961 pcs
thumb image of 52ct Oval Cabochon Reddish Black Star Garnet (ID: 380196)
52.01ct Star Garnet
21.20 x 17.93 x 11.98mm
USD 260.05
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ID: 4038941 pcs
thumb image of 43ct Oval Cabochon Black Red Star Garnet (ID: 403894)
43.01ct Star Garnet
22.23 x 19.80 x 9.42mm
USD 129.03
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ID: 4031961 pcs
thumb image of 13.8ct Oval Cabochon Cream Star Moonstone (ID: 403196)
13.75ct Star Moonstone
15.92 x 11.76 x 11.08mm
USD 48.54
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ID: 4426142 pcs
thumb image of 1.3ct Oval Cabochon Blue Star Sapphire (ID: 442614)
1.29ct Star Sapphire
5.24 x 4.23 x 2.63mm
USD 25.80
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ID: 4030671 pcs
thumb image of 22.8ct Oval Cabochon Cream Star Moonstone (ID: 403067)
22.78ct Star Moonstone
17.78 x 14.53 x 12.06mm
USD 80.41
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ID: 4139691 pcs
thumb image of 16.5ct Oval Cabochon Cream Star Moonstone (ID: 413969)
16.54ct Star Moonstone
18.75 x 12.81 x 9.53mm
USD 66.16
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ID: 4140401 pcs
thumb image of 24.9ct Oval Cabochon Black Red Star Garnet (ID: 414040)
24.90ct Star Garnet
17.72 x 14.24 x 8.80mm
USD 74.70
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ID: 3506401 pcs
thumb image of 32.7ct Oval Cabochon Black Star Sapphire (ID: 350640)
32.74ct Star Sapphire
19.42 x 16.43 x 8.30mm
USD 892.49
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ID: 4318841 pcs
thumb image of 32ct Oval Cabochon Black Red Star Garnet (ID: 431884)
31.96ct Star Garnet
18.43 x 12.52 x 11.61mm
USD 71.59
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ID: 2888231 pcs
thumb image of 26.5ct Round Cabochon Reddish Black Star Garnet (ID: 288823)
26.52ct Star Garnet
15.06 x 9.94mm
USD 132.60
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ID: 4038891 pcs
thumb image of 62.4ct Round Cabochon Black Red Star Garnet (ID: 403889)
62.40ct Star Garnet
24.34 x 9.79mm
USD 187.20
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ID: 4033061 pcs
thumb image of 17.3ct Oval Cabochon Cream Star Moonstone (ID: 403306)
17.30ct Star Moonstone
19.41 x 15.76 x 8.22mm
USD 61.07
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ID: 4141491 pcs
thumb image of 72ct Oval Cabochon Black Red Star Garnet (ID: 414149)
71.96ct Star Garnet
24.69 x 20.07 x 13.11mm
USD 215.88
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ID: 3506601 pcs
thumb image of 7ct Oval Cabochon Black Star Sapphire (ID: 350660)
7.01ct Star Sapphire
12.44 x 9.68 x 5.17mm
USD 135.36
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ID: 3072781 pcs
thumb image of 20.5ct Oval Cabochon Cream Star Moonstone (ID: 307278)
20.45ct Star Moonstone
18.36 x 12.54 x 12.15mm
USD 81.80
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ID: 3906481 pcs
thumb image of 7.2ct Oval Cabochon Black Star Sapphire (ID: 390648)
7.17ct Star Sapphire
12.55 x 9.57 x 5.22mm
USD 107.55
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ID: 4040031 pcs
thumb image of 57.4ct Oval Cabochon Black Red Star Garnet (ID: 404003)
57.41ct Star Garnet
23.79 x 21.00 x 10.57mm
USD 172.23
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Star Cabochons
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