Signet Ring

by Gail
(Bournemouth, UK)

I have my Mum's signet ring. The mark inside it is very small and I have not even been able to read it even with a magnifying glass. A friend took it to a jeweller who said that the mark just stated that it was 18 carat gold. Why does it not have any other marks? Is it English or has it come from abroad? Is there any way I can tell how old it is?