A mid 20th century old-cut diamond single-stone ring

Diamond estimated weight 0.50ct, J-K colour, SI clarity.
Stamped 18ct.
Ring size K. 2.8gm.

Condition Report:
Scratches and small marks.
Wear to the gallery.
Thinning to the band, acid discolouration to the band.
Diamond is in an illusion mount and appears fairly bright.
Electronically tests to white metal as approximately 9ct gold, with silver and other metals.
Fellows uses a Thermo Scientific Nitron Handheld XRF Analyser to test metals. This technology is limited to examining metal to a depth of approximately 8 microns.
Fellows does not guarantee the standard of gold or platinum unless an item is hallmarked. Results from electronically tested items should only be used as a guide and with caution, as false readings are possible.
Free virtual viewings are available by appointment. Please email jewellery@fellows.co.uk for more information and to book an appointment.
Condition reports are offered as a guide only and we highly recommend inspecting any lot to satisfy yourself as to its condition.
For any further questions you may have on this lot, please do not hesitate to contact Ben Randall at ben@fellows.co.uk