(Extra time has been allotted due to the number of gems needed.)
Make gems using 17 oz. fondant. ( Use jewelry fondant & gum paste mold to make 1,000 small round gems. Use brush and white Pearl Dust/lemon extract mixture to paint gems. Let dry overnight on cornstarch-dusted board.
Attach gems. ( Use piping gel in a cut parchment bag to pipe a dot on back of gems; attach to cake. Begin with a row at bottom of each cake, then place successive rows in the spaces between gems of preceding row. Continue over top of 8 in. cake and cover top of 6 in. cake.