Lot of three gold rings

18k yellow gold setting buckle shaped, embellished by set diamonds.
1) ring with a single big buckle:
N. 02 round shaped diamonds, brilliant cut. Hallmarked "750". IT size 16 - US size 7 1/2.
2) ring with two buckles:
N. 06 round shaped diamonds, brilliant cut. Hallmarked "750 - 1538 AL". IT size 15 - US size 7.
3) ring with one white gold buckle and a yellow gold setting:
N. 02 round shaped diamonds, brilliant cut. Hallmarked "750 - 1538 AL". IT size 16 - US size 7 1/2.
Total weight 12.5 gr.
Item condition grading: ***** excellent.