Why is a Kashmir sapphire worth 10x more than a Ceylon sapphire? Sotheby’s Jane Ki dives into the world of high gemology to compare two of the most famous sources of blue sapphires. Which do you prefer? Let us know in the comments. Discover these and more in the High Jewelry auction on 23 April at Sotheby's Hong Kong. Luxury Week is presented by @stancharthk. Still haven’t subscribed to Sotheby’s on YouTube? ►►youtube.com/sothebys #sapphire #gemstone #gems #jewelry #jewellery #jewellerydesign #jewelrymaking #luxury #style #fashion #hongkong #auction #explained