I recently found out by an estate jewerly broker that the mikimoto pearls I inherited 35 years ago were probably switched by the jeweler when I had them restrung by a local jeweler in bloomington Minn. I was 20 years old didint know anything about pearls,my mother said they were genuinely round pearls. The clasp doesnt have the M brand and there's no knot in between each pearl. was told the quality was very poor. I did have another jeweler offer me $500 for them several years ago,but he didn;t even check the clasp to see if it was mikimoto, I did have them in the original box. red velvet with blue velvet on the bottom and yellow silk on top. I am completely sick about this. My only hope is that possiblythese pearls were purchase prior to 1949 and the clasp wasn't branded. My gut tells me they were switched. The estate broker told me the box was worth more then the pearls. Gina