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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

by: Jeffries, David

Publication date: 1750

Topics: Diamonds--Early works to 1800, Diamonds--Prices--Early works to 1800, Pearls--Early works to 1800, Pearls--Prices--Early works to 1800

Publisher: Printed by C. and J. Ackers for the author

Collection: gialibrary; additional_collections

Language: English

"The first book in English to describe how diamonds and pearls can be evaluated on the basis of the factors of size (or weight) and style of cut, with allowances being made in the case of diamonds where cut stones depart from the ‘ideal’ proportions that were accepted as standard in Jeffrie’s time….The ‘ideal’ cut in Jeffries’ time is a cushion brilliant, ‘old mine’ cut, with the pavilion much deeper than employed in modern stones…."--Gemology by J. Sinkankas, entry no. 3195.

Includes tables of values for diamonds and pearls.