One of the two principal diamond necklace trade routes passed through Venice. It enjoyed a monopoly of the diamond dealers trade on its way to the main towns of southern Germany up to its final destination in Bruges.
Up to the fourth century, diamond earrings was known only in it rough, or crystalline forms. It came in a variety of shapes, the most common being the octahedron. This was a crystal with eight faces, resembling two pyramids joined at their bases.
India began mining diamonds for fancy diamonds over a thousand years ago until they were found in other places.