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The value of pearls varies considerably, size, shape, quality, color, and freedom from spots and marks all being factors which make a great difference in worth. The judging of pearls requires a keen eye for difference in shades, much experience, and a knowledge of current prices. It is a business at which few become proficient.

There is just one point in connection with the calculation of the shilling base (often written as 1/-x in the trade) which should be made. It will be obvious that, if a graduated string, or lot, of pearls be divided into various sizes, and the 1/- base be calculated for each separate size, the sum total would be greater than if the lot were considered as being of one size. For instance, if three pearls weighing respectively 5 grains, 3 grains, and 2 grains be considered, the sum total of their 1/- base would be 25/-, plus 9/-, plus 4/-, that is, 38/-. But if these three pearls be considered as one lot, the 1/- base would be calculated as 3 pearls weighing 10 grains, which average 3.33 grains each, the 1/- base therefore being 33-3> or 33/4.