Corpus of Electronic Texts Edition
The Gaelic Maundeville (Author: John Maundeville)

paragraph 138

Other diamonds are gotten in Arabia, and they are large, but not so good. And another diamond is found in Cyprus, and a diamond in Macedonia. And another portion of them is found in Amasee12 when men separate the gold and the ore, and the Indian diamond is no harder than this. Another good diamond is obtained in crystal, and a diamond in the lodestone, and they two are gotten together, cleaving to each other, for there is a male kind of them, and a female, and the dew of heaven nourishes them, and in that country it is commonly said that many diamonds are engendered by those two. I myself have seen this, (that) if they be taken for a little time to the place where they grow, and laid under the dew, they increase in size there.