Diamonds and precious stones, a popular account of gems .. . Fig. no.—Pendeloque of Tavernier. style have the form of flattened pears almost round,of a pendeloque shape, facetted both superiorly andinferiorly, and having a very small table Babinet thinks that this is the form in whichboth the Koh-i-noor and the Star of the Southshould have been cut. There is also the Star, invented by Caire, andbut little used. It was designed in order to take 264 PRECIOUS STONES. advantage of certain clear portions of rough dia-monds, which could not be otherwise used with-out great sacrifice of mate
Diamonds and precious stones, a popular account of gems .. . Fig. no.—Pendeloque of Tavernier. style have the form of flattened pears almost round,of a pendeloque shape, facetted both superiorly andinferiorly, and having a very small table Babinet thinks that this is the form in whichboth the Koh-i-noor and the Star of the Southshould have been cut. There is also the Star, invented by Caire, andbut little used. It was designed in order to take 264 PRECIOUS STONES. advantage of certain clear portions of rough dia-monds, which could not be otherwise used with-out great sacrifice of material. Fig. m will showthe appearance of stones cut in this manner. Theform on the left represents the upper portionof the stone; the other two figures are alterna-tive forms in which the lower portion of the stonemay be cut. The cutting of the diamond includes three series*of operations: the splitting or cleaving\ the cutting,. Fig. III.—The Star invented by Caire. properly so called; and the polishing. Specialworkmen are required for each one of thesebranches.^ It is to the splitter that the rough diamond isgiven; his quick penetration and ready action areto determine the future of the stone. First of all, he examines very carefully the little * The illustrations in this section relating to diamond-cutting aretaken from fine water-colour drawings sent from Amsterdam andexecuted specially for this work. /
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectgems, booksubjectprec
