Raj,
This set has gold plating throughout but we do not know the karat used. The metals used should be brass, aluminum and a base metal zinc alloy. The various parts were sold as lead free/compliant, but we cannot say if all the components are nickle free. So it is not recommended for those with metal sensitivities. It is costume jewelry and therefore not intended for daily or extended wear, for adults only, and not for use by children. Hope that helps!
Sincerely,
Dana Bates
www.azureaster.com