The main opals that Mac deals with and creates jewellery with are from the Koroit and Yowah Opal fields. Generally on a visit out to one of these opal fields Mac will have dealings with the miners. He stays at their camps, looks at opal with them in the 'rough', and buys 'parcels'. Some of the miners come to the shop with their rough and Mac will set up chairs downstairs, a tub of water, which you dip the rough into and you hold it in the sun (hence, the chairs outside if you have ever been to the shop) and you then get an idea of what sort of colour you are chasing when you cut it. It is a...