The company should obtain a creative patent for this product.
Step-by-step explanation:
A creative patent comes with a creative license which can either be made revenue-able or kept in the free common license which does not produce profit when used by someone else.
This would ensure that the design of the jewelers will not be copied by anyone else under any circumstances as they will have the right ot use the design or let others use the design on their now terms which they can then use as a stable source of revenue for themselves.