I was making and selling a dog tag made of sterling silver, then cut a heart out of the dog tag and attached the heart to a ring band, making this a set. I was later contacted by an attorney saying that I had infringed on another persons design. My design looks different from the other design. I also made a round pendant with a heart cutout and attached the heart to a ring band, but she said that I infringed on her "design" itself. I stopped selling these sets since receiving the letter from the lawyer. I've talked to several people who have told me that I didn't infringe. I'm so confused! Is this considered infringment?