I don't know if this has already been done. Could be a pinned thread ? ROLEX CRYSTALS REFERENCES GUIDE 1) TROPIC CRYSTALS : TROPIC 3 : 6503-6526, 6615-6623, 6706-6724, 6800-6807, 7936 TROPIC 5 : 6418, 7902, 7932 TROPIC 6 : 6220, 6221, 7910 TROPIC 7 : 6266, 6546 TROPIC 8 : 6434, 6546 TROPIC 9 : 6244, 6246, 6444, 7903, 7913, 7927, 7933, 7955 TROPIC 12 : 1002-1011, 1014, 1022-1039, 5500, 5501, 5506, 5520, 5552, 5590, 6422, 6423, 6426, 6427, 642