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THE "KOH-I-NOOR" DIAMOND.                   71
Our great mineralogist identifies this with the large Diamond described by Baber, the founder of the Mogul empire, in his Memoirs, the authenticity of •which is unquestionable :—" He mentions it as part of the spoil taken by his son Humajun at Agra, after the battle of Paniput, in which fell Ibrahim Lodi, and with him his ally or tributary, the Eajah of Gwalior, Bikramajeet, custodian of the fortress of Agra. It is reported by Baber to have come into the Delhi treasury from the conquest of Malwa by Ala-ud-deen in 1304."
"Baber gives its weight as about eight miskkah. in another passage he estimates the mishkal at forty rath, which would make its weight 320 ratis." After men­tioning the varying weight of the rati at different times and places, he proceeds : " But the eight mishkals of Baber afford a far more hopeful estimate of the weight of this Diamond. This is a Persian weight, and seems to be and to have been far less liable to variety of value at different times or places. The Persian mishkal, or half-dirhem, weighs 74'5 grains Troy, and eight of these equal 596 grains, or 187-58 carats. The Koh-i-noor in the Exhi­bition of 1851 weighed 186 carats. This would require a weight of 1-848 grain for the rati,—a number nearly approximating to that given by the coins of Akbar."
Applying, then, the conclusion that the great Diamond which was the spoil of Ala-ud-deen in 1304, and had pro­bably been for ages the crown jewel of the independent Eajahs of Malwa, passed to the Mogul conqueror of the Patan sovereigns, and was so inherited by the Mogul emperors, its subsequent history may be thus traced. " It remained at Delhi until another, the fiercest and the last, of the great inroads of the western Tartar peoples broke over the hills of Affghanistan, and flooded the plains of North-Western India.