Royal jewellery is typically meticulously catalogued and noted by eagle-eyed experts. But there is one piece in Princess Anne 's collection that remains something of a mystery: the silver and amethyst brooch she wore to a rugby training session over the weekend.

The Princess Royal reserves the piece – a large, circular design with jewels placed at the four compass points on the outer ring – for engagements relating to her role as patron of the Scottish Rugby Union, thus leading royal fashion commentators to nickname it the ‘ Scotland Rugby Brooch’. Princess Anne has worn the piece to matches, meet-and-greets and, perhaps most memorably, when she discussed her love of sport with the Prince and Princess of Wales on her son-in-law Mike Tindall's podcast, The Good, The Bad and The R

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