Here is a lovely modern brooch by the Danish modernist master Niels Erik From (see bio). The design of decreasing rings incorporates From's signature design of an off centre cabochon in a partially oxidised dish.  This brooch has a bale attached to the rear, so you can also wear it as a pendant. 

Condition: Excellent, no visible damage

Marks:  Sterling, Denmark, N.E.From 925S

Size:  1.3" (3.5cm) across. Chain is 18 " (46cm) long

Year: 1960s