Here is a list of pearl terms that should help you better understand this site and the discussions within the community forum. It is compiled from multiple sources and we believe it to be one of the most comprehensive lists available.
yakkah: Historical Persian quality factor describing natural pearls of secondary quality.
yellow grains: Nineteenth century theory of natural pearl production stating that yellow grains found in some freshwater pearls were from shell-production reserve material. This organic material made its way into the mantle and catalyzed pearl growth.
yoyo: Japanese term for a host mollusk’s 45-day convalescence period after implantation of a bead nucleus and donor-mollusk tissue piece.
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