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PRECIOUS STONES 51
in
price occur. Few importers and dealers assort their goods exactly
alike, and after the assortment is made, the ratings of the various
lots by different dealers seldom agree. Take, for instance, an original
lot of one hundred carats, of which seventy-five are clean. Of the
twenty-five imperfect, probÂably one-fifth would be badly so; these are
the rejections. Then the parcel may contain, for example, twenty-five
per cent, averaging two-grainers, thirty per cent, three-grainers,
twenty-five per cent, four-grainers, and twenty per cent, five-to
eight-grainers. This gives an assortment as follows:
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Suppose
the lot cost one hundred dollars per carat, the problem is to place a
valuation on these different lots so as to come out even on the cost of
the parcel, with none of them too high to meet competition, or so low,
if sold first, as to leave the others unsafe at their respective
ratings. A fair rating of these various lots as the demand is to-day
would be as follows:
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