You may have heard it the first time you put on one of your mother’s gold necklaces and paired it with her silver bangles. Or the time you came home from the hardware store with brass towel racks for your family’s bathroom, only to be met with stares of disbelief as your spouse pointed out the chrome faucet and knobs. We’ve all heard it somewhere: “You can’t mix metals! Gold with gold, silver with silver, copper with copper, etc.” Finally, there’s good news for those who’ve always bucked the “matchy-matchy” system, since mixing metals isn’t just acceptable—it’s hot! As more and more designers enter the arena to show off their metal-mingling acumen, the look is catching on everywhere. The caveat?