4X4 mm Princess center stone, 2X 2.2mm round stones3d printable model of a preset ring the center stone could be exchangd with a colored stone.the STL file includes has its prongs longer to facilitate the stone setting.3 formats are included, STL, OBJ and 3DM The 3dm files are meshes NOT nurb models.Metal weights are included in the pictures.For any questions or request, don't hesitate to contact me.