This is the craftsman who actually sets the stones in to jewellery. Some of his vocabulary are:
Pavé – a style of setting whereby many small stones are all set close together in a seemingly random way to resembles a cobblestone pavement.
Rubover – a style of stone setting whereby metal completely surrounds the stone and is pushed, or rubbed, over the edge to hold it securely in place.
Facet – one of the flat polished faces of a gemstone.
Claws – the small prongs of metal that fold over a stone in a piece of jewellery to hold it in place.
Cabochon – a style of fashioning gems into a smooth polished dome.
Inclusions – These are internal features such as tiny crystals of other minerals caught up during the development of the larger host gem crystal. They can be used to identify gemstones, where they are from or whether the stone is natural or synthetic.