Is It OK to Copy a Necklace Design and Donate It to a Charity?

by Sherry.

I saw a necklace online, and I want to make it. I wanted to donate it to a church auction/raffle.

I don’t wear jewelry much. I don’t know if it is OK to do, or would it be a copyright infringement?

When I copy another artist on canvas for practice, I always write “study” on it, or I write on back that it’s a study and name the original artist.

But since I cannot write on jewelry, what is the rule? If its wrong, I will not do it.

Thanks for your help.

Sherry