Vintage 1960s Rivoli Watermelon Rhinestone Cufflinks cheap Set NOS

This is a beautiful pair of rhinestone cufflinks with matching tie tack, unused new old stock, that I acquired from the estate of a jeweller. He used cheap to import cufflinks and watches and would market them under his private label “Tempo”.
These rhinestone cufflinks are made in a silver tone metal and set with what I think are Austrian rivoli rhinestones.
The rhinestones reflect a rainbow of colours depending on lighting conditions - primarily, blue, purple, green and yellow depending on lighting and angle. I believe that these are referred to as “watermelon” stones. The stones are beveled and cut flat in the center.
This is a gorgeous rhinestone cufflinks set - super quality and beautiful colour....