Handmade 9k or 18k gold necklace in a 40×4 mm rectangular piece. and sterling silver back plate with 25×12 mm semicircular pieces of onyx and obsidian. Golden sterling silver chain.

The onyx It is a variety of black agate, composed of silica, of volcanic origin. Its name comes from the Latin onyx  which means "nail". According to Greek legend, Eros cut Aphrodite's divine nails and scattered them on the sand so that their power would last, turning them into stone. The ancient Greeks called onyx all varieties of agate, from the lightest to the darkest. Later, the almost black variety was called onyx.
In Greek and Roman antiquity, this stone was used to make cameos in which goldsmiths carved the figures of famous people on pieces of onyx.
Throughout history, it has also been used to decorate seals, a type of ring worn by authorities to certify official transactions.
The largest producer of onyx is Mexico.

The obsidian It is a natural glass of volcanic origin from Anatolia. It is black or dark gray with white veins and has been used since the Stone Age for its cutting qualities and hardness. The word derives from the Latin orbysius.