I've never used commercial jewellery cleaner - gin and / or normal soap was what my Granny taught us to use. And gin does bring gemstones to a lovely shine.
I've been taught to use detergent liquid for diamonds as it removes grease. The only jewelry cleaner I've owned turned out to have a label warning against potential cancerogene substances.
The indoseapearls is still on facebook. There are postings that they are going to be away for "A few weeks" and advising a client not to send her pearl until they are back.