One hallmarked for London 1968, opening to reveal a cushion cut kunzite in a silver gilt coronet, came in a retailer’s box for Collingwood of Conduit Street.
The second opened to reveal a trio of amethyst crystals in a gilt nest style surround, in a case retailed by Cartier.
Key to their appeal – and a price way above the £200-500 typically commanded by Devlin surprise eggs – was a personal letter from Stuart Devlin confirming their unique design along with signed photographs and an original receipt.
They sold online via thesaleroom.com.