By Erika Winters

An 8.41-carat fancy vivid purple-pink diamond is expected to fetch between $12.8 and $15.4 million at Sotheby's Hong Kong. Image: Sotheby's

An 8.41-carat fancy vivid purple-pink diamond is expected to fetch between $12.8 and $15.4 million at Sotheby's Hong Kong. Image: Sotheby's