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I have bought a set of vintage cufflinks and necktie pin with pearl on each item in a Japanese thrift store . Its almost 5.5mm each . What type of pearl is this if its from Japan origin? How much will it costs?

My friend's uncle,also got a non nacreous shell and results from XRD and XRF analyser revealed a 96.41%,99.30%& 99.35% respectively in 3 location points. Aragonite with traces of Calcite. Does it really mean its a Non Nacreous pearl? Its 7 kilograms by weight.