Estate Diamond, Brown Diamond & Purple Sapphire Stacking Rings

One centering a Square Brilliant cut diamond, flanked by ribbon motif sides set with twelve Round Brilliant cut diamonds weighing approx. 0.12ctw., fashioned in 18k white gold, one centering a brown square brilliant cut diamond weighing approx. 0.20ct., flanked by ribbon motif sides set with twelve Round Brilliant cut diamonds weighing approx. 0.12ctw., fashioned in 18k yellow gold, and one centering a round faceted purple sapphire weighing approx. 0.30ct., flanked by ribbon motif sides set with twelve Round Brilliant cut diamonds weighing approx. 0.12ctw., fashioned in 18k rose gold. Size 5 3/4.