10-carat pink diamond could fetch $25 million at Sotheby's auction (1/5)

A 10.64-carat fancy vivid purplish pink internally flawless diamond is the top lot of Sotheby’s Hong Kong Magnificent Jewels and Jadeite sale on October 7. Its estimate is $19.1-$25.5 million. (Photo: China News Service/ Zhang Wei)

A 10.64-carat fancy vivid purplish pink internally flawless diamond is the top lot of Sotheby’s Hong Kong Magnificent Jewels and Jadeite sale on October 7. Its estimate is $19.1-$25.5 million.(Photo: China News Service/ Zhang Wei)

The Dunhuang Pipa Necklace by Anna Hu with a $6.25 million high estimate.(Photo: China News Service/ Zhang Wei)

The Dunhuang Pipa Necklace by Anna Hu with a $6.25 million high estimate.(Photo: China News Service/ Zhang Wei)

The Dunhuang Pipa Necklace by Anna Hu with a $6.25 million high estimate.(Photo: China News Service/ Zhang Wei)