Queen Marie-Amélie's Sapphire, Diamond, and Pearl Tiara and Parure, France (1830; made by Bapst; sapphires, pearls, diamonds). More information here: http://orderofsplendor.blogspot.com/2013/07/tiara-thursday-two-french-sapphire.html
Crown of Princess Margaret of York, sister of Edward IV & wife of Charles the Bold, Duke of Burgundy. Made c. 1461. One of 2 English crown that survive from the medieval period. Via Irish Archaeology FB
St Edward’s Crown 1661 Made from solid 24kt gold and now permanently set with 444 semi precious stones from the personal collection of George V. It weighs more than 2kg and Queen Elizabeth was said to practice wearing it for weeks preceding her coronation to get used to the weight. It is only worn once officially for the act of coronation and never again after that.