Hand engraving is the most exclusive but at the same time the most laborious and painstaking of all types of engraving. This requires a great deal of patience and precision of movement from the master. Handmade engraving has its own special relief and is considered much more valuable due to its uniqueness, which the master invests from himself in each of his work.
The engraving is done by an engraver who is a small cutter made of very hard metal. With this cutter, the chips are removed layer by layer to the required depth, creating the desired pattern or lettering.
In the video below, you can see how a master draws a drawing by hand and then engraves
In the following file, you can see the table of ring sizes for different countries Ring-size-chart.pdf