While eternity rings had already been in use for over a century by the early 1900s, the Art Deco era's focus on precision and innovation saw the development of the now-classic channel setting and used it at length for diamond and gem-set eternity bands. 

Very good vintage condition with wear in line with age and use. c1950s. Originally manufactured in US. 

Details:
• Platinum, unstamped but tested
• Fits size 6 1/4 and do not recommend resizing
• 31 single cut diamonds approximately 0.41 carat total weight
• Ring measures 2.4mm wide and 1.4mm thick
• 2.2g