Jewellery › Edwardian Banded Agate and Diamond Shell Stickpin Image 1 of 2 Image 2 of 2 Edwardian Banded Agate and Diamond Shell Stickpin £1,400.00 The hardstone scallop shell set to the centre with an old mine-cut diamond Reference. SN7527 Add To Cart Added! The hardstone scallop shell set to the centre with an old mine-cut diamond Reference. SN7527 You Might Also Like Antique Agate and Diamond Pill Box Late 19th-century Diamond Star Brooch/Pendant Edwardian 9ct Gold Stock/Tiepin Antique Diamond and Enamel Pheasant Stock pin Pair of 9ct Gold Mother of Pearl and Amethyst Cufflinks