Account of the Topazes and of Their Prices in Calicut

The natural topazes are found in Ceylon which the Indians call pur ceraga, it is very hard stone and very cold and heavy like the ruby and sapphire, because all three are of one kind. Its perfect colour is yellow like beaten gold, and when their colour is perfect and pure, whether they be great or small, in Calicut they are worth their weight in fine gold, and this is their price usually; and if the colour is not so perfect they are worth their weight in gold of fanams which is less by half, and if it is almost white they are worth much less, and they make small diamonds of them.