Miner will pay a special dividend worth $4 billion, or $2.43 cent a share, as it recorded its highest annual underlying earnings in the last five years.
The rock, a unique transparent one with a visible yellow shade and of gem-quality, is the second major find since the launch of the Verkhne-Munskoye diamond deposit.
The International Council on Mining and Metals (ICMM), a London-based industry group representing 27 companies, is setting an independent panel of experts to develope a global standard for tailings facilities to be enforced to its members.
The portfolio would include their Kalgoorlie super pit 50/50 joint-venture in Western Australia, as well as other regional assets such as Porgera, Tanami and Boddington mines.
The world's largest primary silver producer and Mexico's No.2 gold miner warned of possible lower prices, higher inflation and worsening foreign exchange rates in 2019.