Here's what I did:
This is what the clay looked like to begin with. I rolled it out to about 1/4 inch thick.
I then used little scissors and my fingers to create a heart shape that I was happy with.
I used a tooth pick to poke a hole in the heart. I then baked the clay according the the instructions. For this particular clay, it was baked at 275 degrees for 15-20 minutes. I placed it on a pieced of paper while it was baking so it wouldn't be directly on the pan. I read that this helps if from getting shiny on the bottom side.
I then painted my heart using acrylic paint. I did a layer of black first and then used silver.
I threaded my hemp twine through the heart and I had a necklace.