Heart of the Ocean

The Heart of the Ocean is one of the most recognizable pieces of jewellery in the world. It is the original replica of the exquisite necklace featured in the movie, Titanic. Gloria Stuart, who portrayed the elderly Rose in the movie, wore this replica to the 1998 Academy Awards. It was created by the well-known jeweller Harry Winston, with a real blue diamond of 15 carats. Priced at $20 million, the necklace is one of the most expensive pieces of jewellery worn to the Oscars, and among the world’s costliest necklaces. Even its imitations sell for $3.5 million at auctions, due to its history of love.
source by https://www.wonderslist.com/10-most-expensive-jewellery-pieces-in-the-world/