Left is Rubys 'Hood' Badge as it existed on a wall of her Pub before I repainted it. Right is the same badge during re-painting. The finished badge can be seen on the 1919 Official Badge Page. The Bones of every Offical British Navy Badge whatever the shape, is the Crown, Nameboard and Cableboarder, this is also the standard for Fleet Air Arm Squadron Badges and for Ships of the Royal Australian and Royal Canadian Navies.

If your painting a Badge its best to use a Pictorial Reference, having painted many I have observed the following...

The Naval Crown: The crown originates from a Roman design and is gold, the ruby, pearl, emerald, and sapphire jewels should be the only other colours, if you wish to be particular to current MoD badges the inner part of the crown is Red. 

The Nameboard: If you wish to be particular to Charles Ffoulkes the Nameboard on certain badges is the field colour with gold letters otherwise it should be gold with black 3 dimensional lettering, if you wish your badge to be particular to current MoD badges then it should be black with 1 dimensional gold letters.

The Cableboarder: The Cable is alway's gold. 

As with all painting there's an amount of preperation work to be done! Firstly check the badge is clean and free of dust, you can clean the badge briefly with a sponge and hot soapy water then leave to dry!

You can find Replica Badges for sale on Ebay 'type in' hms crests.