vintage 14k gold cross pendant with diamond - pendant only no chain

Vintage 14kt yellow gold cross with one genuine prong set diamond. I do not know the carat weight of the diamond- it is approximately 2mm using a tape measure. This is a large bold piece with a large bail. The chain is for display and not included. I do not see a gold hallmark on this piece, it has been acid tested and it is real gold. There are some scratches to the back of the pendant as pictured.