Pearls Weight and Pearls measurement
The weight of cultured pearls shall be expressed in:
- carats or
The weight of a natural pearl shall be expressed in:
- pearl grains,
- liang, or
- carats ,
- (four grains are equal to one metric carat) or methgal a unit of weight used in the Arabian Gulf that is equal to 4.5 grams,
- note also the chaw .
IMPORTANT: It is acknowledged that the weight of a natural or cultured pearl may change over time.
NOTE: It is an out of line exchange practice to distort the weight of any natural or cultured pearl or to trick as to the weight of any natural or cultured pearl. It is likewise an out of line exchange practice to state or generally speak to the weight of all natural or cultured pearls contained in any article unless such weight figure is went with equivalent accentuation and unmistakable quality by the words “downright weight”, or expressions of comparable importance, in order to show plainly that the weight so expressed or spoke to is that of all pearls in the article and not that of the inside or biggest one.
NOTE: The SI (Système International) by and large uses the term mass rather than weight. Mass is a measure of an article’s inertial property, or the measure of matter it contains. Weight is a measure of the power applied on an article by gravity or the power expected to bolster it.
The measurements of a solitary natural (5.118) and/or cultured (5.48) pearl should be communicated to the closest one fourth (.25) of a millimeter for sizes beneath 10 mm and closest one tenth (.10) of a millimeter for sizes 10 mm or more.
The accompanying measurements should be contained in the depiction of a solitary natural or cultured pearl;
– round shape: most extensive breadth
– extravagant shape: most extreme length, greatest breadth
The measurements used to portray a graduated strand of natural and/or cultured pearls should incorporate the most extreme distance across of the biggest and the littlest. The measurements should be communicated to the closest one tenth (.10) of a millimeter.
The measurements used to portray a uniform strand of natural and/or cultured pearls should be communicated in one half (0.5) mm to 1.99mm varieties and expressed as the base size, e.g., 6 – 6.5 mm, subordinate upon the normal size of the strand.
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Articles source: THE PEARL BOOK, Natural, Cultured, Composite and Imitation Pearls — Terminology and Classification (Including data on alterations), 2013-08-12, CIBJO/Pearl Commission.