Laboratory-Created Gemstone Production Methods

TABLE 2�
LABORATORY-CREATED GEMSTONE PRODUCTION METHODS

Gemstone	Production method	Company/producer	Date of first production
Alexandrite	Flux	Creative Crystals Inc.	1970s.
Do.	Melt pulling	J.O. Crystal Co., Inc.	1990s.
Do.	do.	Kyocera Corp.	1980s.
Do.	Zone melt	Seiko Corp.	1980s.
Cubic zirconia	Skull melt	Various producers	1970s.
Emerald	Flux	Chatham Created Gems	1930s.
Do.	do.	Gilson	1960s.
Do.	do.	Kyocera Corp.	1970s.
Do.	do.	Seiko Corp.	1980s.
Do.	do.	Lennix	1980s.
Do.	do.	Russia	1980s.
Do.	Hydrothermal	Lechleitner	1960s.
Do.	do.	Regency	1980s.
Do.	do.	Biron Corp.	1980s.
Do.	do.	Russia	1980s.
Ruby	Flux	Chatham Created Gems	1950s.
Do.	do.	Kashan Created Ruby	1960s.
Do.	do.	J.O. Crystal Co., Inc.	1980s.
Do.	do.	Douras	1990s.
Do.	Zone melt	Seiko Corp.	1980s.
Do.	Melt pulling	Kyocera Corp.	1970s.
Do.	Verneuil	Various producers	1900s.
Sapphire	Flux	Chatham Created Gems	1970s.
Do.	Zone melt	Seiko Corp.	1980s.
Do.	Melt pulling	Kyocera Corp.	1980s.
Do.	Verneuil	Various producers	1900s.
Star ruby	do.	Linde Air Products Co.	1940s.
Do.	Melt pulling	Kyocera Corp.	1980s.
Do.	do.	Nakazumi Earth Crystals Co.	1980s.
Star sapphire	Verneuil	Linde Air Products Co.	1940s.