Oh, I forgot to add another reply from the exhibition curator regarding where Malta sourced their pearls from during the late 1800s:
"Dear Andrea,
Unfortunately we are not sure of the source of the seed pearls. They were certainly available in large quantities, judging by their extensive use on traditional jewellery, in Malta and in Italy however they do not seem to occur naturally in the Mediterranean. Bearing in mind that Malta was one of the chief coaling stations in the Mediterranean and that the opening of the Suez canal meant even more maritime trade passing through our harbours it could well be that pearls were sourced from as far away as india or the gulf. I have heard old jewellers say they would get them from Italy, however the Italian source would likely have brought them from elsewhere so that doesn't help much. It is one of the questions that I am grappling with and hopefully eventually further research will clarify this matter for us.
Kind regards,
Francesca "