A Unique 3 3/4" resin Mermaid Tail with sand from Horseneck Beach in Westport MA but you can choose sand from more than 200 more beaches worldwide to customize your necklace.
https://www.anniemara.com/lovethisbeachcollection
Neckwire is a 14 1/2" beaded memory wire with silver plated tubes, 8 ceramic beads and a lobster claw clasp with a 2" extender.
 
When the silver plating tarnishes, clean it with toothpaste, silver polish will remove the finish.