Sterling Silver Pearl and Stud Chain Bracelet Two extremes meet in the Birks Rock & Pearl® Freshwater Pearl and Stud Chain Bracelet. Angular sterling silver studs are complemented by lovely 7 mm round freshwater pearls. The Birks Rock & Pearl® Collection is a tribute to the stunning contrasts in the Canadian landscape. From the soaring Rocky Mountains to the delicate pearls found in bodies of water, our natural world is an amazing combination of sharp and round, of strength and softness. The Birks legacy of fine craftsmanship ensures the delicate beauty of this appealing design.