Can a wedding and engagement band be made out different materials?

I have a scratch on my wedding ring band. How can I repair it?

My boyfriend got me a gold engagement ring. He insists it's real gold but the ring keeps turning my finger green. Why?

Does glass jewelry work in metal settings, such as gold, silver or other metals?

Which metals should I wear if I'm allergic to fake jewelry?

Does a high gold K weight mean a harder or softer metal?

Which metals are best for body piercings?

What is gold plated jewelry?

Ring or studs to avoid infection? What specific precious metals are the best for earrings?

What is the definition of "fine" jewelry?