Can I place a custom jewlery order in like this?

I really want a custom ordered star of david /cross pendant for the holidays this year. My parents are both jewish and christian so it represents who i am. I look for already made ones for sale but none of them WOW me. I want it to be classy but unique. Some design or crystal. Personally i like silver mor ethen gold. I visualize the perfect necklace to be silver star of david and a cross made of aquamarine or diamond stone =D Where can i place a custom order like this?