Above Theresa Marchioness of Londonderry is seen in full gala dress.
The ornament can be divided into three brooches. Garrards made it in
1853 for Frances Anne, widow of the 3rd Marquess of Londonderry The
estimate for manufacture was £175.
The diamond stomacher consisted of 230 carats of diamonds in total;
the largest diamond was 15 carats and mounted in silver and gold. The
diamonds were taken from a Garter insignia and sword of the Viscount
Castlereagh which he had worn at the coronation of George IV in 1821.