Here are the thickness measures of several typical US coins for comparison:
You may use US coins to obtain a better grasp of how thick or broad a piece of jewelry is. For thicker things, stack many coins to get the approximate thickness or breadth of your chosen jewelry.
The thickness of a dime is 1.35mm, while the diameter is 17.9mm.
The thickness of a penny is 1.55mm, while its diameter is 19.05mm.
Nickel has a thickness of 1.95mm and a diameter of 21.21mm.
The thickness of a quarter is 1.75mm, while the diameter is 24.26mm.