Indeed, Astrid emeralds seems to be hidden in the vault :s
We have:
* the emerald & diamond tiara * the huge emerald earrings * the enormous emerald brooch + pendant * the Stockholm Tiara * the star-brooch
I think that we should wait untill the death of HM Queen Fabiola untill we can see those jewels again. Remember that we only saw the emerald choker-bracelet-tiara back after the death of Grand-Duchess Joséphine-Charlotte in 2005.