Can anyone confirm that this is a necklace of collet diamonds. It is always hard to tell them apart but, if anyone happens to know which necklace this is, that would be great.
At first I thought it might be the South African necklace but there does not seem to be the right spacing between collets.
I do not recall HM wearing collets (other than the Coronation NL) very often so this photo seems a bit rare to me.