METHOD OF MANUFACTURING SYNTHETIC OPAL Russian patent published in 1999 - IPC

Abstract RU 2132414 C1

FIELD: jewelry. SUBSTANCE: synthetic opal is grown under hydrothermal conditions at 280-300 C and pressure 20-39 MPa, after which crystals are cut into blanks for subsequent mechanical treatment, polishing, and heat treatment in sand at 500-590 C. EFFECT: improved procedure. 1 tbl

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RU 2 132 414 C1

Authors

Dates

1999-06-27—Published

1994-04-12—Filed