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 / [David Jeffries].

  • Jeffries, David (David J.)
Date:
1750
Catalogue details

Licence: Public Domain Mark

Credit: 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 / [David Jeffries]. Source: Wellcome Collection.

    35/170 (page 3)
    IMs ) - They might be carried on ad infini- tum; and the rule of valuing will hold good, tho’ they thould weigh as much as Governor Pitt's Diamond, _ purchafed by the Duke of Orleans for ‘the prefent French King, which weighs 136 carrats +, or as three others men- ‘tioned by Monfieur Tavernier, in the ~fecond part of his voyages, p. 148, finglifb tranflation, viz. that of *the Great Duke of Tu/cany, which weighs 139 carrats 2, or that in a merchant's hhands, which weighs 242 carrats + or that of the Great Mogul, which weighs 279 carrats 5% If what is contained in this treatife ae be found true, it will confute the no- tion, that fome Diamonds and Pearls are ineftimable, on account of their extraordinary magnitude; which, to this time, prevails, upon the fuppofi- tion that no methods can be found ‘to : Ba deter- i *