teardrop-shaped pendant resting on a dark, porous surface resembling volcanic rock

teardrop-shaped pendant resting on a dark, porous surface resembling volcanic rock. The pendant has a silver-colored twisted wire frame surrounding a black stone or glass insert. Two small, circular white markings are visible on the black insert, one near the top and one near the bottom. The pendant appears to be lying on a natural dark stone surface. Given the lighting and texture of the stone, the location of the city of Riga, Latvia cannot be determined based on only the image, as there are no clear identifying landmarks or features within the photograph.