Strathmore Rose Tiara Lady Elizabeth Bowes-Lyon (the future Queen Elizabeth, the Queen Mother) received it as a gift from her father, the Earl of Strathmore, for her wedding in 1923. The piece itself is likely older than that; it may have already been an antique when the Earl purchased it.
The Strathmore Rose diamond tiara was made around 1900 by Catchpole & Williams. Allegedly, The Earl if Strathmore gave it to his daughter ( Lady Elizabeth Bowes-Lyon, aka the Queen Mother) in 1923. The tiara is feminine and beautiful; there are five large diamond roses separated by diamond sprays. Additionally the diamond roses can be fashioned into brooches.