I think you're probably right. Beside the similarities you've already pointed out, there's also this characteristic distance between pendant and necklace in both pictures.
--Previous Message-- : thank you Maud for these pictures..I have : never seen Silvia in that picture..and when : I first saw it, I thought, is it possible : that she is wearing big unidentified pendant : of Groom's grandmother (Crown Princess : Margaret of Sweden)??? : : now before I hear " oh no its not the : same" think about how many pendants : like this we have seen at all in Sweden or : elsewhere ..such an unusual large oval/round : shape..also take into consideration that in : black and white picture the angle of the : pendant is more facing us..thus revealing : more detail... : : the shadows in Silvia's picture have the : five angle shape..plus what ever stones are : surrounding it... : : its not a far fetched idea that it might be : the same pendant..what do you all think ?? : : : : :