4 Carat Alexandrite Pear (13.53×8.15mm, Bluish Green)
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64 mm
| Your settings | |
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Ring |
Gold |
Skin tone |
Light |
Ring diameter |
16.9 mm |
Ring width |
3.0 mm |
Finger length |
64 mm |
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Ring diameter:
16.9 mm
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Additional Info
Named after Czar Alexander II (1818–1881) Alexandrite is a rare and valuable color-change variety of chrysoberyl. Alexandrite possesses a surprising ability to change color - from green or bluish-green in daylight, it transforms to purplish or raspberry red in incandescent light.
Where to buy?
For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile
Gem Details
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Name:
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Alexandrite |
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Mineral Class:
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Chrysoberyl |
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Shape:
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Pear |
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Chemical Formula:
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BeAl2O4 |
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Crystal Structure:
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Orthorhombic |
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Hardness:
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8.5 |
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Specific Gravity
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3.7 |
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Carat weight:
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4 ct |
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Gram weight:
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0.8 g (0.0282 ounces) |
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Points:
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400 pts |
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Length:
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13.53 mm |
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Width:
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8.15 mm |
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Est. face-up size:
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80.5 mm² |
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Volume:
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216.22 mm³ |
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Length-to-width ratio:
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1.66 |
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Refractive Index:
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1.744 - 1.755 |
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Cleavage:
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1,1 ; 3,2 |
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Luster:
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Vitreous |
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Birefringence:
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0.009 |
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Wearability:
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Durable gem for daily wear |
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Care Instructions:
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No special or unusual care |
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Color:
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Birthstone:
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Alexandrite is a birthstone for the month of June |
Popular comparisons:
- 4ct Alexandrite (Pear, Bluish Green, 13.53 x 8.15) vs. 2ct Diamond (Oval, White, 10.23 x 6.82)
- 4ct Alexandrite (Pear, Bluish Green, 13.53 x 8.15) vs. 4ct Diamond (Pear, White, 14.36 x 8.65)
- 4ct Alexandrite (Pear, Bluish Green, 13.53 x 8.15) vs. 4ct Emerald (Emerald, Dark Green, 11.56 x 8.56)
- 4ct Alexandrite (Pear, Bluish Green, 13.53 x 8.15) vs. 4ct Sapphire (Pear, Blue, 13.18 x 7.94)
- 4ct Alexandrite (Pear, Bluish Green, 13.53 x 8.15) vs. 3ct Diamond (Pear, White, 13.05 x 7.86)
- 4ct Alexandrite (Pear, Bluish Green, 13.53 x 8.15) vs. 2ct Amethyst (Pear, Violet, 12 x 7.23)
- 1ct Alexandrite (Pear, Bluish Green, 8.52 x 5.13) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 0.42ct Alexandrite (Pear, Dark Purple, 6 x 4) vs. 0.5ct Alexandrite (Pear, Dark Purple, 7 x 5)
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