Jewelry Shop › Lake Superior Agate Necklace Image 1 of 2 Image 2 of 2 Lake Superior Agate Necklace $30.00 Handmade Lake Superior Agate necklace by owner Mark Christensen. Includes 20 inch 925 silver chain. Purchase Added! Handmade Lake Superior Agate necklace by owner Mark Christensen. Includes 20 inch 925 silver chain. Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More