Watches & Jewellery
The $1.5m gem 'not seen for decades'
The Emperor Maximilian Diamond is one of two exceptional treasures for sale at Christie's
World's biggest gem expo in Hong Kong
Expo will feature 3,000 exhibitors from 44 countries and the largest-ever diamond pavilion
Gem unearthed from 2,300 years ago
Carved jewel found in Israel depicts legendary general
