The necklace worn by CPss Victoria for the State visit to Finland 2004 and two or three times before is a sapphire, pearl and diamond necklace. It was a gift from Crown Prince Gustaf (late Gustaf V) to his wife Princess (late Queen) Victoria (née Baden) when they came home to Sweden after their wedding. Both Queen Silvia and Princess Lilian has worn the necklace.
Victoria always wear a portrait of her father when she is dressed in gala and i think its a frame of diamonds this was given to her when she turned 18 years old. In the past the it was a painted portrait now a days the miniature is a photo
On the other thread, CP Victoria's jewellery part II, Josefine asked information concerning a diamond riviere necklace. I've lost count of the number of the different collet necklaces of the Bernadotte's but this particular necklace, Josefine pointed out, consists of quite large, graduated diamonds and can be worn with a pendant (usually the pear shaped diamond). It's said to have belonged to Queen Victoria's mother, the Grand Duchess Louise of Baden.
This picture from Danjel's site shows that there must be several collet neckaces of different lenghts. Part of them might be possible to shorten or lenghten or combine together... Also the pear shaped diamond can be seen on the shortest necklace.