VISCOUNTESS CHURCHILL ART DECO DIAMOND TIARA BY HENNELL
This Art Deco diamond tiara by Hennell can be converted into necklace/brooch/two bracelet and pair of ear-clips
With estimated price at £40,000-60,000. The tiara dated circa 1930 belonged to Viscountess Churchill (1895-1972), the second wife of the 1st Viscount Churchill. It was worn by Viscountess Churchill at the 1937 coronation.
Viscountess Churchill, born Christine McRae Sinclair, married Victor Albert Spencer the 1st Viscount Churchill in 1927, as his second wife. The Viscount was a distinguished courtier whose career spanned the late Victorian and Edwardian eras and was a second cousin of Sir Winston Churchill.
Pictures of converted form of the tiara can be found in this source link