ALEXANDRITE dikenal dengan Cat’s Eye

ALEXANDRITE	June’s birthstone
Major Sources	Brazil, India, Madagascar, Russia, Sri Lanka & Tanzania
Colors Found	Teal, blue green to forest green changing to violet, crimson red, raspberry, purple & orange
Family	Chrysoberyl: BeAl2O4
Hardness	8.5
Refractive Index	1.74–1.76; Biaxial (+ or –)
Specific Gravity	3.70–3.78
Crystal System	Orthorhombic
Enhancements	May be enhanced

Batu permata ini bagus bila di cutting model Cabochon seperti pada gambar di atas, bila kena cahaya warna bisa berubah-ubah. Permata ini sangat jarang ditemukan jadi harganya lumayan mahal.