'The Loch Ness Monster Biting a Fish' Ring. Why are there two letters symbols on this ring?

by Aika
(Singapore)

What is the item?
It's an intaglio ring.

Can you please provide all background information?
Not sure where it's from. It has a bloodstone with a design of Loch Ness Monster biting a fish. Perhaps a family's crest.

What are the markings?
Correct me if I'm wrong:
'R.N.W' which from my research is Richard Whitehouse
'A Crown' which is from Great Britain
'18' which means 18 ca of gold
'Head of Jaguar' which I know it's an Essay Office in London?
'q' which I calculate year 1863.
For the outer ring, there's a symbol of letter 'h' which I calculate the year 1871.

Where are the markings?
Everything is on the inner ring. Only the letter 'h' is on the outer.