18ct Gold Diamond and Sapphire Boat Ring c1900

This is a beautiful antique 18ct gold diamond and sapphire ring.
There are three sapphires and four diamonds.
They are all old cuts and have been claw set in a boat shape, typical of the Victorian period.
This ring has 18ct yellow gold shoulders and shank.

Hallmarked: Sheffield (the date stamp is missing)
Stamped: 18
Weight: 2.1 grams
Measurements: ring head 6mm wide approx. at the widest point.
UK size: M