This is a Cuban link chain, a classic style known for its bold, thick, and tightly interlocking oval links that lie flat. It is a fully "iced-out" piece, meaning the surface of the links is paved with numerous stones to create maximum sparkle.
The stones used are Moissanite, a lab-created gemstone chosen for its exceptional brilliance and fire, which often surpasses that of a diamond due to its higher refractive index. Many moissanite Cuban chains feature high-quality stones, such as VVS1 clarity and D color. This option is significantly more affordable than a comparable diamond chain and is popular for making a high-end luxury statement.