History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c17.s3.t4.9
History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c17.s3.t4.9
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v1.c17.s3.t4.9
Diamond was used not only as gem but also as an abrasive. Gwinnett and Gorelick (1988: 187-193) have studied one of the seven rock crystal artifacts obtained from Arikamedu (dated not later than 300 A.D.) and proved that this ‘lapidary training piece’ was drilled with a twin diamond drill.