Necklace

Design:
Pendant:
The central pendant is circular, featuring what appears to be a double "C" or interlocking ring motif at its center, surrounded by a halo of small, clear stones that resemble cubic zirconia or diamonds. The overall shape is reminiscent of a sun or flower, with radiating elements around the central design.
Chain:
The necklace is suspended from a delicate, silver-toned chain, likely a flat cable chainwhich appears to be of a standard length.
Earrings:
The matching earrings echo the design of the pendant's outer halo, featuring the same circular shape with surrounding stones. 
Finishing:
The metal components exhibit a polished, shiny finish, suggesting a silver or silver-plated material. 
The stones are set in a way that provides a radiant and sparkling appearance, indicative of a quality finish for costume or fine jewelry. 
Material:
Based on the appearance and common jewelry materials, the necklace and earrings are likely made of sterling silver or a silver-plated base metal, possibly brass or alloy. 
The clear stones are most likely cubic zirconia or similar simulated diamonds, given their uniform appearance and common use in this style of jewelry.