Crown Princess Mette-Marit of Norway in her royal family's amethyst tiara
(photo det kongelige hoff)
February is the month of amethysts and while this stone has a very regal colour - what could be more royal than purple - it's not that popular in current jewel collections in Europe's ruling houses. But when it does turn up in a tiara it's hard to ignore - the colour, the sparkle and the settings usually make for impressive pieces. This month's look at the stone in royal settings now arrives in Norway for the latest part in Amethysts for February.

