Diamond mining company Alrosa showcased a unique collection of polished diamonds at the Carnegie Hall in New York on Tuesday. The collection, named Dynasty Diamond, includes five diamonds which are cut from the same crystal. The original diamond was polished in Moscow and has been worked on for the past year and a half. Alrosa Diamonds CEO Pavel Vinikhin described the five diamonds as a... Еще “master piece” due to the fact they “meet the highest standards, the greatest colour and quality.” According to Alrosa, this could be the most expensive diamond ever manufactured in Russian jewellery history due to its quality. Alrosa will sell the collection at an online auction on November 29.