LauraM was the first to find the information about the silver wedding gift from South Australia.

Laura published her find on RJWMB some years ago, and subsequently Ursula did a page on it. See https://royal-magazin.de/england/queen-alexandra/alexandra-south-australia-diamond-collarette.htm

I simply found better quality images of the gift and of course the references to Queen Alexandra, when Princess of Wales, wearing rubies.

I apologise to LauraM for not acknowledging her research yesterday.