Chain: 18 inches lightweight chain
Pendant: 18mm dia x 2 inches.
Material: unknown metal content, stone (turquoise may be real or color may be dyed Howlite)
Picture is an example, each is extremely similar.
Beautiful and unique handmade Tibetan jewelry made in Nepal and Tibet by Tibetan refugees.
Repoussé refer to a metalworking technique in which a malleable metal is shaped by hammering from the reverse side to create a design in low relief.