I'll quote Steve Jobs: "Simple can be harder than complex. You have to work hard to get your thinking clean to make it simple. But it’s worth it in the end because once you get there you can move mountains."The materials recommended by the designer are gold/rhodium plated.
Maybe we'll not move mountains but this is the last of my heart pendants, born on all the work to create other hearts. I like his simplicity, I like clean models. Moreover... it's pretty cheap :)
If you're low on budget but you want a polished nice finished surface choose polished brass