You are welcome to come by my studio to get your ringsize measured if you are in doubt about your size.
If this is not possible, you can measure the inner diameter as accurately as possible of a ring that fits you. Remember that a wide ring can feel smaller than a thinner ring even though they are the same size.
If you are interested in getting one of my designs in a larger or smaller version, you are welcome to contact me for more information at firstname.lastname@example.org or at +45 27580590. My studio is open by appointment in Lange-Müllers Gade 15, 2100 Copenhagen.