The Royal collection of jewels does contain a major amount of jewels that used to be worn by the Male Princes for formal wear. These pieces are large and heavy and has not been worn for almost 200 years. Those pieces are kept and protected in case fashion dictates changes in the future.
The actual origin of the ‘Royal Kisses’ Bracelet is unknown, but the name was given by Grace when she saw the “X”s on it. Princes Rainier did not understand what she was talking about as the use of ‘X’ for Kisses is a North American thing.