Silver tone jeweled cross colorful necklace

Silver tone jeweled cross necklace with colorful gems / jewels. I don't think it's real silver, possibly silverplated? It has no marks. Very nice and shiny, no tarnish. Nice quality. 18" chain with a 3" extender. Pendant is a little over 1" long. Colors are red, purple, yellow, green, light blue. Assuming stones are simulated and not real gems, but I really don't know. Pretty and sparkly!