I have an issue in that my mother's solitaire engagement ring was stolen. I need to find out what a current value would be on the ring. The last appraisal was done in 1987; it was valued at $7273. the appraisal reads: Lady's 14k yellow gold 6mm flat polished wedding band set with (1) @2.0 ct brilliant cut round diamond in a 6 prong white gold head. Clarity I/1, Color H-I, Mounting wt 4.4 dwt How would I go about getting a current fair market value?