signed vintage brooch

Hi! I have a vintage brooch, made with seed pearls, and it is shaped like a parallelogram... on one side on the back it is signed but I can't be positive of the name. It looks like a four letter word starting with J, and I think it is either Jado, Jada, or Jade. In researching it, I came across an auction offering a lot of signed brooches, and I thought they mentioned JJ Jado, or J Jado, but now I can't find it! Can you help? I also have a lovely one signed ART(c), and I did manage to come up with some info on that artist. I found a couple of his brooches listed for sale in the $40 range.