Mens Vintage (1978) 9 Carat Gold Onyx Oval Set Signet Ring with Diamond Chip - N½

A 9 carat gold oval signet ring set with onyx and a central diamond chip.

Bears hallmarks for Nathan Brothers of Birmingham and the date letter 'D' for 1978.

I measure the inside diameter to be close to 17.3 mm (N½) but should be fine for sizes N & O too.

Has light wear and minor scratching commensurate with age and use but in an overall good condition.

I don't own jewellery scales for the exact decimal weight but is at least 4 grams.