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DIAMONDS AND PEARLS. 67
of
a carat weight; which, it is presumed, persons of good judgment cannot
be at a loss to know, let them be good, bad, or indifferent ; and that
such will agree in their sentiments concerning the value of a stone of
a carat weight, be it, as it may, to five or ten per cent.
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Of the Table of Prices of Diamonds.
The next
thing to be taken notice of, is a table, which will be found in the
11th, 12th, 13th, 14th, 15th, and 16th plates. This table consists of
the price of diamonds, from one carat weight to an hundred carats;
formed upon the principle of valuing them by the square of their
weight, upon the supposition that the governing price of rough
diamonds, good and bad blended together, is 21. per carat; so that 21. is
to be reckoned the mean or middle price, and will be found of great use
to prevent the trouble of calculating the price of every stone by the
rule. If any stone differs in its value from this mean or middle price,
whether higher or lower, so
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