karma, this is what I found on the carved amethyst brooch - from the Court Jeweler:
The Queen also owns this lovely diamond and emerald thistle brooch, which features a carved amethyst in its design. Above, the Queen wears it for a garden party at the Palace of Holyroodhouse in July 2013. Many have speculated that one of the Queen’s thistle brooches might be part of a quartet of brooches featuring national symbols, given to the Queen by the Sultan of Oman as a Diamond Jubilee present in 2012. To me, this one shares intriguing design similarities with some of the other candidates, including the Diamond Daffodil Brooch, the Diamond Shamrock Brooch, and the Tudor Rose Brooch.
https://www.thecourtjewel...ttish-royal-brooches.htmlSo now that we can count the Queen Mother's Thistle brooch into the mix it makes even more sense to loan one to Sophie.
I have to say I always thought HLM was too chary with the royal jewels. Anne has a good number of patronages in Scotland and spends a deal of time there too - she should have been lent a brooch by her mother.