This massive Art-Deco men's signet ring features a traditional Russian technique called 'Northern niello'. Black niello inlay is made of a mixture of copper, silver, and lead sulfides. Niello technique is frequently used to produce vintage-style jewelry because this beautiful black finish was first developed and used in the northern provinces of Russia in the XVII century AD. Only Russian gentry used to wear such jewelry at that time to the amazement and envy of the foreign ambassadors. Nowadays 'Northern niello' is successfully conquering the world markets. We bring you this irresistible masterpiece made in the best traditions of Russian jewelers.