This diamond is one of the most famous diamonds in the whole world not because it is very expensive, but because it appeared in Titanic which is also one of the most famous romantic movies. This increases the popularity of the necklace and makes it highly sought after by most of the girls and even men to present it to their wives trying to express their true love. The necklace was created by Harry Winston using a fabulous and rare blue diamond that weighs 15 carats. The Heart of the Ocean diamond necklace was worn by actress Gloria Stuart at the Academy Awards in 1998 to be the most expensive jewelry piece worn at the Academy Awards by an actress. The Heart of the Ocean Diamond is believed to belong to Louis XVI and was was worn as a crown. - See more at: http://www.topteny.com/top-10-most-expensive-diamond-rings-necklaces-in-the-world-2015/#sthash.IykWQOn3.dpuf