Antique 18ct 750 Gold Ruby & Old Cut Diamond Ring Navette boat shaped Cluster M.5 - N egyptian revival base metal and sometimes pitch

base metal and sometimes pitch or plaster of paris inside these - besides destroying it to find out there's no way to know how much actual gold is in there

Would warrant a little more research

opal doublet

We think its  a generic

Antique 18ct 750 Gold Ruby & Old Cut Diamond Ring Navette boat shaped Cluster M.5 - N egyptian revival base metal and sometimes pitchDescription: Lovely, clear, fat little old cut diamonds and natural rubies in this eternally popular design (up and down ring? Right hand ring? Cocktail ring? Whatever you want to call it!) Age: c1910 Edwardian Size and weight: UK Size M and half N, US 6. 5. Bear in mind that Its a little difficult to measure the ring size precisely with long rings. This one can be sized a little but please ask before purchasing. Materials: 18ct Yellow gold, platinum,