Exhibition 2015 " A Royal Welcome " Jewels are not copies.
Zimbio
"As part of the tour of the Palace, visitors also enjoy a special exhibition in one of the State Rooms. Her Majesty’s evening dresses and personal jewellery, Her Majesty’s Coronation gown, Her Majesty’s wedding dress, and the Ballroom set up for a State Banquet."
"The exhibit promised a display of The Queen's jewelry - as it should, since no state banquet would be complete without some dazzling diamonds - and now we get a peek at the selections. From the gallery above, you'll see the following pieces (at least): Queen Alexandra's Kokoshnik Tiara The Queen's Royal Family Orders. The Coronation Necklace and Earrings The Dorset Bow Brooch. Among the orders on display is the Riband and Star of the Darjah Utama Temasek (Order of Temasek) from Singapore. Together with the jewels, this is the same combo that she wore to the 2014 Singapore banquet, except she paired it with the Girls of Great Britain and Ireland Tiara at the time."