While most tiaras are passed down through generations, the one Princess Margaret wore on her wedding day in 1960 was purchased shortly before the big day. This sparkling hair accessory features diamond clusters and scroll motifs set in silver and gold. You could say the Poltimore Tiara appreciated in value considerably after she wore it. While it was originally auctioned for £5,500 (about $7,570), it resold in 2006 for £926,400 (around $1,275,154).