WATCH OUT FOR TREAT­MENTS

Hong Kong Tatler - - Style -

Treat­ments that won’t af­fect the trans­parency of the stone, such as wax­ing, are ac­cept­able, but heavy en­hance­ments and the in­tro­duc­tion of for­eign ma­te­ri­als and dye de­value the stone. Chow says that buy­ers must look out for resin-treated stones or con­cave cabo­chons, as th­ese have un­der­gone pro­cesses to re­move de­fects or ar­ti­fi­cially im­prove translu­cency.

In lab­o­ra­tory re­ports, jadeite is clas­si­fied as Type A, B or C. Type A refers to a stone that has been waxed but un­der­gone no chem­i­cal treat­ment. Type B jadeite has been im­preg­nated with a syn­thetic sub­stance to en­hance translu­cency. Type C refers to a stone that is usu­ally colour­less or of very faint tone that has been ar­ti­fi­cially dyed to en­hance its sat­u­ra­tion—an en­hance­ment that will fade with time. With Type A jadeite com­mand­ing some of the high­est prices of gems to­day, Chow says it’s al­ways worth pay­ing for an in­de­pen­dent re­port to con­firm that what you are buy­ing is gen­uine. Auc­tion houses such as Bon­hams en­sure each piece comes with a lab re­port from an in­de­pen­dent agency.

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