The optical features and chemical composition of nucleated freshwater pearls accompanied with metallic luster

Abstract

Nowadays freshwater pearl’s entry into a pearl market is remarkable. At one time, many of freshwater pearls were non-nucleated and show distorted shape but nucleated freshwater pearls show nearly round. Freshwater pearls which possess high quality of colour and luster in parallel with marine pearls, can be seen. Moreover, freshwater pearls which emit metallic strong luster beyond pearly luster and show unique beautifully shinning appearance accompanied with rainbow interference colours, can be found very rarely. I introduce this pearl here and report the results by gemmological tests and chemical analysis in the characteristic pearls.