Synthetic single crystal for alexandrite gem

Details Synthetic single crystal for alexandrite gem Synthetic single crystal for alexandrite gem

1979-09-14

1980-12-23

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

156605, C04B 3544

Patent

active

042408342

ABSTRACT:
Disclosed is a synthetic single crystal for an alexandrite gem, which consists essentially of a synthetic chrysoberyl single crystal comprising aluminum oxide and beryllium oxide as the main components and chromium and vanadium as the coloring components, wherein vanadium is contained in an amount of about 0.00075 to about 2.95% by weight based on the crystal.
This single crystal shows a green or bluish green color under natural light and the color is changed to red or reddish violet when the single crystal is exposed to tungsten light the single crystal of the present invention is comparable or superior to natural alexandrite produced in the Ural Mountain Region with respect to the hue and color change characteristics.

REFERENCES:
patent: 1952255 (1934-03-01), Jaeger
patent: 3567643 (1971-03-01), Flanigen et al.
patent: 3723337 (1973-03-01), Yancey
patent: 3912521 (1975-10-01), Cline et al.

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