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chap, xxii             FAMOUS DIAMONDS
Remarks upon the largest and most beautiful Diamonds and Rubies which the Author has seen in Europe and Asia, the figures of which are here given, together with those of large Stones which he sold to the Emperor on his return from his last Journey to India, with a representation of a magnificent Topaz, and the largest Pearls in the World.
I shall follow the order of the figures as they are arranged [in PL II] by their numbers, and I shall commence with the heaviest diamond of which I have any knowledge :
No. 1. This diamond * belongs to the Great Mogul, who did me the honour to have it shown to me with all his other jewels. You see represented here its form after having been cut, and, as I was allowed to weigh it, I ascertained that it weighed 319| ratis, which are equal to 279 9/16 of our carats. When in the rough it weighed, as I have elsewhere said, 907 ratis, or 793| carats. This stone is of the same form as if one cut an egg through the middle.2
quios, quoted by Dalgado. Orta does not use the word Chego, although he describes the process of passing the pearls through a sieve. The earliest mention appears to be that in Teixeira (see Ferguson's note on p. 179 of the Hakluyt Society ed., 'The Kings of Ormus'). He says ' the reckoning and weighing is by Chegos, by a method not easy, but very subtle and ingenious '. The system appears to have been used for· seed-pearls mainly or only in the Ceylon fishery. Dalgado says the word is not now in use, and he has not been able to trace its origin."
The relationship between the real weight called the mangelin in Madras, and the nominal weight called chow, though it does not elucidate this table, throws some light on the subject. Buie—Square the number of mangelins, and divide three-fourths of this product by the number of pearls. The quotient is the number of chows. Example—To find value
1 For full discussion of all the facts connected with the Great Mogul's diamond, see Appendix I.
1 This operation may be performed in either of two ways ; from the figure given by Ta vernier he evidently means transversely. The Koh-i-Nûr as it was when brought to England might be described as of the shape of half an egg, cut longitudinally, but this difference of form,