You are admiring an amazing specimen, very high on collectors lists, an Excellichlamys histrionica(Gmelin, 1791) measuring quite large at 40.7mm and graded F++/Gem...wonderful form & a fantastic color pattern & markings are displayed...an exceptional specimen. This beauty was diver collected at 5-10m off Maiton Island, Thailand. A member of the collector favorite Pectinidae family, rarely seen today & an excellent addition for your collection. Thank you for visiting our store this afternoon...great to see you again.