A Treatise on Diamonds and Pearls: In which Their Importance is Considered: and Plain Rules are Exhibited for Ascertaining the Value of Both: and the True Method of Manufacturing Diamonds

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C. and J. Ackers, 1751 - Diamonds - 155 pages
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Page 15 - Ikill facets, are of a triangular figure. Both of thefe partake equally of the depth of the upper fides from the table to the girdle ; and meet in the middle of each tide of the table and girdle, as . alfo at the corners.
Page ix - Royal Highnefs the Prince of Wales. Her Royal Highnefs the Princefs of Wales. His Royal Highnefs the Duke.
Page xxi - Bezilt : the upper sides and corners of the brilliant, lying between the edge of the table and the girdle. Collet : the small horizontal plane or face, at the bottom of the brilliant. • P...
Page 37 - A rough diamond must be chosen uniform, of a good shape, transparent, not quite white, and free of flaws and shivers.
Page xxi - The collet is the small horizontal plane or face at the bottom of the brilliant. The crown is the upper work of the rose, which all centres in the point at the top, and is bounded by the horizontal ribs.
Page 14 - ... the under fides muft be flattened at the top, to anfwer the above flattening at the girdle, and at bottom muft be of each fide of the collet.
Page x - Francis Afcough, DD Clerk of the Clofet to his Royal ' Highnefs the Prince of WALES.
Page 14 - T of one fide of the girdle ; and each corner rib of the under fides, muft be flattened at the top, to anfwer the above flattening at the girdle ; and at the bottom ~ of each fide of the collet.
Page 119 - Stone has, the higher it is in efteem, although fuch holes may prejudice itj if it were to be manufactured ; but as that is never intended, they do not regard...
Page 36 - Stone from the bafe to the point, muft be half the breadth of the diameter of the bafc...

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