What material is the Swarow necklace?

Hello. Swarovski necklaces are made of precious metals.

Yes, it's rhodium. Rhodium is a rare precious metal, its color is

Silver white, metallic luster. Because of its stable chemical properties, it is corrosion resistant.

Corrosion and good luster, so it was designated as the necklace material of Swarovski. I hope my answer can help you.