An uncut 1,109-carat diamond is set to be auctioned off Wednesday in London. It's the largest uncut diamond in the world and the second largest ever found. The sale comes at a time that the British pound has lost more than 10% of its value due to the Brexit vote. That has already put a damper on a recent London art auction held earlier this week. The diamond auction will be held at Sotheby's (BID) in London at 6:30 p.m. local time. The tennis-ball size diamond is so large that it does not fit into conventional scanners used to evaluate a stone's potential worth. It was discovered in Botswana in November. It is named Lesedi La Rona, meaning "Our Light" in Botswana's Tswana language. It is surpassed in size only by the 3,106 "Cullinan Diamond" found in 1905 in South Africa. A cut of that diamond, known as the "First Star of Africa," now is part of British royal family's crown jewels.