![An unmounted coloured diamond of 118.05 carats is displayed, at Christie\'s auction rooms in London, April 9, 2019. The diamond estimated at 2,500,000-3,500,000 US dollars will be sold at the Geneva Magnificent Jewels auction on May 15. (Photo/IC)](http://www.ecns.cn/hd/2019/04/10/e9ec4ae147e143f3b084804f6af4b178.jpg)
An unmounted coloured diamond of 118.05 carats is displayed, at Christie's auction rooms in London, April 9, 2019. The diamond estimated at 2,500,000-3,500,000 US dollars will be sold at the Geneva Magnificent Jewels auction on May 15. (Photo/IC)
![A model wears a rare aquamarine and diamond tiara by Faberge, at Christie\'s auction rooms in London, Tuesday, April 9, 2019. The tiara estimated at 230,000-340,000 US dollars will be sold at the Geneva Magnificent Jewels auction on May 15. (Photo/IC)](http://www.ecns.cn/hd/2019/04/10/dd1a2a247fa942669064c265af140b8b.jpg)
A model wears a rare aquamarine and diamond tiara by Faberge, at Christie's auction rooms in London, Tuesday, April 9, 2019. The tiara estimated at 230,000-340,000 US dollars will be sold at the Geneva Magnificent Jewels auction on May 15. (Photo/IC)
![A model wears a 19th century emerald and diamond fringe necklace, during a media opportunity at Christie\'s auction rooms in London, Tuesday, April 9, 2019. The necklace estimated at 1,500,000-2,500,000 US dollars will be sold at the Geneva Magnificent Jewels auction on May 15. (Photo/IC)](http://www.ecns.cn/hd/2019/04/10/97b6571633d54af89d23dd5ddeb582ba.jpg)
A model wears a 19th century emerald and diamond fringe necklace, during a media opportunity at Christie's auction rooms in London, Tuesday, April 9, 2019. The necklace estimated at 1,500,000-2,500,000 US dollars will be sold at the Geneva Magnificent Jewels auction on May 15. (Photo/IC)
![A model displays a natural pearl sautoir with one hundred and ten natural pearls, at Christie\'s auction rooms in London, Tuesday, April 9, 2019. The necklace estimated at 2,500,000-3,500,000 US dollars will be sold at the Geneva Magnificent Jewels auction on May 15. (Photo/IC)](http://www.ecns.cn/hd/2019/04/10/cf8ca59056bb43ca911839cc039e84c3.jpg)
A model displays a natural pearl sautoir with one hundred and ten natural pearls, at Christie's auction rooms in London, Tuesday, April 9, 2019. The necklace estimated at 2,500,000-3,500,000 US dollars will be sold at the Geneva Magnificent Jewels auction on May 15. (Photo/IC)