Carved Jade Cufflinks

Carved Jade Cufflinks Carving seems to depict the Lotus Flower Markings indicate gold filled backing. 1/20-12 G.F.K. (Gold filled uses a karat gold overlay which is then bonded to a brass inner core. JK Findings manufactures gold filled with1/20th 12 karat gold, meaning, it is 5% 12 karat gold by weight with a brass inner core.) Actual age unknown. Good condition Mounting Pad is 1.5" across for size reference.