The Romans had access at an early period to the gem-producing countries. Ceylon and India had long been known to the Roman merchants, and their caravans traversed entire Asia from the coast of Syria to the Chinese ocean in two hundred and forty-three days. Their fleets sailed regularly in the time of Claudian from the Red Sea to Ceylon, Coromandel, and Malabar. Ceylon was then famous for its luminous carbuncles and the lustre of its pearls. The famous fairs of Armenia and Nisbis, which attracted the merchants of Asia, also furnished the Romans with many of their luxuries. There certainly were no serious obstacles to the introduction of the gem into the bazaars of the wealthy nations of the Mediterranean in early times and subsequent periods if it was then an article of commerce. With the ancient history of the gem there is also a remarkable fact to be considered in its study,--its diminutive size. It is believed by many antiquaries that the diamonds known or used by the Romans were well-defined octahedral crystals, of not over four or four and a half karats weight. It may be stated in reply that the exportation of larger gems may have been forbidden by the Hindoo rulers, as we have seen in later times concerning the rubies found in Burmah. But we place but little confidence in this objection. Large and fine gems, had they been known in the days of Roman prosperity and luxury, would surely have found their way from time to time to the wealthy marts of the empire. There is other evidence to found the belief that most, if not all, of the diamonds of antiquity were of small size. The celebrated traveller and diamond merchant Tavernier boldly asserted in his day, that prior to the sixteenth century the largest diamonds seen in India were about ten to twelve karats weight. Tavernier was well informed of the history of the gem, and had visited several times the most famous mines of India. We are inclined to support the views of the French traveller, and believe that the famous diamonds known as the paragons are of modern discovery, or since the sixteenth century. CHAPTER III. DIAMOND LOCALITIES. The diamond is widely dispersed over the earth, and undoubtedly occurs in countries where its existence is not now suspected. The difficulty of detection has restricted its geographical area in history, yet enough is known to regard its deposition as almost universal, or at least quite as frequent as that of gold. In some countries the deposits are very limited, while in others, like those of Africa, Brazil, and India, they stretch away over immense distances. We will proceed to give brief descriptions of the well-known diamond districts, and mention others but little known to commerce or the mineralogists. For more extended accounts of the historical mines we must refer the reader to the works of the authors quoted in our text. We will commence with those of Asia.