Vintage garnet ring in 9k gold. 
Sublime craftsmanship with stamps 
REM -  Maker's mark
Crown - Gold
375 - 9k gold
Anchor - Tested and marked in Birmingham
S - 1992
Thickness 4.5mm
UK K1/2 
US 5.5
Inside diameter 16mm
UK M1/2 
US6.5
Inside diameter 17mm