 Yogos tend to be beautiful, small, and very expensive. The United States Geological Survey and many gem experts have stated that Yogos are "among the world's finest sapphires." The roughs tend to be small and flat, so cut Yogo gems heavier than 2 carats (0.40 g) are rare. Only about 10 percent of cut pieces are over 1 carat (0.20 g). The largest recorded Yogo rough, found in 1910, weighed 19 carats (3.8 g) and was cut into an 8-carat (1.6 g) gem. The largest cut Yogo is 10.2-carat (2.04 g). Because of the rarity of large rough Yogo sapphires, Yogo gem prices begin rising sharply when they are over 0.5 carats (0.10 g), and skyrocket when they are over 1 carat (0.20 g).
