This model offers both .3dm and .stl files then you can modify dimension and details easily as you want.

The clean and classical style is never died, as this ring, it's designed for everyday wearing for women.It looks simple but luxury and elegant with requirement of round shape gems/diamond 6 mm - Diameter

Internal Diameter: 16mmExternal Shape (wide x Length x Height): 7.21mm x 19.77mm x 24.70mmThe gem used in this model is round shape with brilliant cut 6 mm - Diameter