Posted by Johan on April 26, 2014, 5:36 am, in reply to "larger pic"
It looks like the saphire necklace can be broken up in three parts:
The back looks like a bracelet or even a bandeau if mounted on a frame. The central cluster could be a brooch and the two smaller ones on either side could become earrings.
It would hand HRH a second (smaller) tiara or her heirs two sets to use.