Featuring an oval aquamarine stone with a diamond setting and a larger diamond surround, The Queen debuted this brooch when opening the 2015 session of the Commonwealth Heads of Government Meeting in Malta.
The name I am using here, the Malta Aquamarine Brooch, refers to that location and not to a known provenance. Some have speculated that use of the piece in Malta at a Commonwealth event could indicate a connection to either Malta or the Commonwealth (however, if one looks at the brooches worn for the same event in recent years, The Queen has more frequently worn brooches without such a connection). Others have wondered where the aquamarine stones that belonged to Prince Philip's mother went (those in the tiara dismantled to create The Queen's engagement ring and Wedding Gift Bracelet, plus the jewels worn with the tiara). But the origin of this lovely and dainty brooch remains unconfirmed at this time.