A replica of Kate Middleton’s $1.5 million worth sapphire and diamond engagement ring was “banned from sale” at a royal gift shop under mysterious circumstances, the Daily Mail reported Sunday. According to sources, the Duchess of Cambridge was the reason behind the ban of sale of the replica Royal jewelry.

“I expect the feeling at Kensington Palace is that it’s rather naff to sell cheap copies of Diana’s engagement ring. One can hardly blame Kate for vetoing the idea of them selling a knock-off of the ring she wears every day,” a palace source told the Daily Mail.

The original ring once belonged to Princess Diana was given to Middleton when Prince William proposed her. The official announcement of the engagement was made on Nov. 17, 2010. Prince William said at the time that the ring "was very special to me" and that giving it to Middleton was "my way of making sure my mother didn't miss out on today."

The replica of the ring was expected to be part of a “Princess Diana jewellery collection” sold online and at the Historic Royal Palaces gift shop at Prince William and Middleton’s official residence, Kensington Palace.

A spokesman for Historic Royal Palaces declined to comment on the disappearance of the replica ring from the collection, but said that the “ring charm” had been inspired by Middleton’s engagement ring.

“We do make the ring but they don’t want us to supply it to the gift shop,” a spokesman for manufacturers Bill Skinner Studio told Daily Mail. While the replica ring will no more be on sale, copies of the ring's matching earrings and necklace will still be part of the collection.