Noun
momme (plural mommes or momme)
A unit of weight used in pearl and paper trading (3.75 grams).
Today, momme weight is still the standard unit of measure used by most pearl dealers to communicate with pearl producers and wholesalers. Source: Internet
Though millimeter size range is typically the first factor in determining a cultured pearl necklace's value, the momme weight of pearl necklace will allow the buyer to quickly determine if the necklace is properly proportioned. Source: Internet