Note 12 — DAVIES GILBERT, (continued 2)
Reading edition
The exact weight of the diamond is said to be 136¾ carats. A carat is equal to 3⅙ grains (see the Universal Cambist by Dr. Kelly, vol. i. p. 220, article London). It weighed therefore 433 grains, very nearly nine-tenths of an ounce troy of 480 grains.