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VALUES AND COMMERCE OF PEARLS 323
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Assuming
that the gram corresponds to 15.43235 English grains, an English
diamond carat will nearly equal 3.17 grains. It is, however, spoken of
as being equal to four grains, the grains meant being "diamond" or
"pearl" grains, and not ordinary troy or avoirdupois grains. Thus a
diamond or pearl grain is but .7925 of a true grain. In an English troy
ounce of 480 grains there are 151-1/2 carats; and so it will be seen
that a carat is not indeed quite 3.17 grains, but something like
3.1683168 grains, or less exactly, 3.168 grains. Further, if we accept
the equivalent in grains of one gram to be, as stated above, 15.43235,
and if there be 151-1/2 carats in a troy ounce of 480 grains, it will
follow that an English diamond carat is .205304 of a gram, not .205409,
as commonly affirmed. The following exact equivalents, in metric grams
and grains troy, of the diamond carat as used in different parts of
the world in 1882, are given by Mr. Lowis d'A. Jackson:
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