An employee shows the main 51.38-carat round-cut diamond, the Dynasty, among other gems from Russian diamond miner Alrosa's Dynasty polished diamonds collection in Moscow on August 3, 2017. - The collection of five polished stones was manufactured from a 179-carat Romanovs rough diamond, extracted at the company's Nyurbinskaya kimberlite pipe in Russia's far northeast region of Yakutia in 2015. Alrosa plans to sell the whole collection in one set at a special online auction in November with the starting price not less than $10 million, according to the company's CEO Ivanov. (Photo by Yuri KADOBNOV / AFP)