New-old-Stock 6 Strand Nat Pearl and Nat Amethyst 19" 'twist' Necklace 14k by Lake Biwa? or possibly Mikimoto?exceptional quality natural pearl necklace pearls are of Japanese origin and are probably from Lake Biwa Pearl Fields necklace originally dates circa 1870 1920 and comes from the estate of an individual related to the Mikimoto Pearl Field Family, but i do not know if Mikimoto and Lake Biwa fields were related in any manner this exceptional quality necklace is comprised of 6 total strands of naturally grown 4. 55mm (approximate based on pearls being