METHOD OF COLORING NATURAL BERYL CRYSTALS AND ARTICLES MADE THEREFROM Russian patent published in 1997 - IPC

Abstract RU 2081950 C1

FIELD: gem treatment. SUBSTANCE: method of coloring natural beryl crystals and articles (jeweler's insertions) to improve their color (simulation of emerald) involves irradiation of natural beryl crystals with ionizing radiation and heat treatment and is distinguished with that thermally treated crystals are submitted to a secondary irradiation, the both irradiation steps being effected with 6-8 MeV electron beam at fluency 10¹⁵-2,5•10¹⁶ electrons per 1 sq.cm, whereas heat treatment is carried out via slow heating and cooling (2-2.5 deg./h) and exposure to 160-170 C for 1-2 h. EFFECT: improved quality of color. 1 tbl

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RU 2 081 950 C1

Authors

Kruzhalov A.V.

Polupanova T.I.

Shul'Gin B.V.

Laskovenkov A.F.

Dates

1997-06-20—Published

1995-03-17—Filed