Scotch Pebble Celtic Cross. $ 53.99. "Scotch Pebble" Real Pebble Jewellery. 3/4" x 1 1/8" long. 20" chain. Hand wrought in Scotland. Scotch pebbles are thought to protect wearers from "evil spirits". The 3000 year old Pictish and Celtic art heritage of Scotland developed in no more than beautiful forms than in the traditional jewellery now so famous throughout the world.