HCR diary 1.5.1819 Mr and Mrs Banks at Charles Aders
9.5.1819 at Mrs Smith's (the future Eliza Aders) Mr & Mrs Banks there "Mr B: otherwise a formal and tiresome man talked about precious stones a subject he understands being by profession a worker of precious stones - he was a very rich man but ran through his fortune and then took to this occupation in which he has talent - as a means of subsistence - his wife is a quiet good kind of woman much praised by Mrs Smith & Aders &c. I walked with them to give them the protection of my umbrella"
I'm most frustrated that I can't at present identify Mr & Mrs Banks as their story interests me