Vintage turtle necklace pendant

this is a vintage pendant i found in 2015 in a thrift store in Savannah Georgia. the pendant is a turtle grasping on to a teardrop shaped loop. the joints where the turtles feet connect to the teardrop and very securely attached, no worries that he might fall off :) Absolutely awesome and I love it so much but I just never wear jewelry. no necklace is included. I have no idea what the Black stone is or if this is real silver.