I recently purchased a 19.5" strand of "Mikimoto" pearls, grade AA, 6mm - 6.5mm. The previous owner purchased them 07/26/1983 in Hong Kong for $14,400.00. They were recently appraised at $1750.00 (Australian dollars). The problem is that, after arrival, it became known that the clasp had been replaced because the original had broken. The new clasp has a small pearl, but no hallmark -- unusual style. On this forum I have read: "remember you're only buying the clasp. Without that, even Miki won't certify the strand. They can't tell their pearls from anyone else's." So, I am in great need of obtaining your thoughts, in that I have a very limited time to return them. I purchased them for $775 (Australian dollars). The pearls are beautiful but I really wanted a Mikimoto strand/clasp. Tried, but can't seem to attach photos.