That’s kind of a trick question. A better question would be, “What doesn’t go with platinum?” Platinum is known to work with just about any gem. Designer Erica Courtney has this to say about this magic metal that is well-known to bring out the best in colored gems:
The richness of platinum when designed around pavé diamonds and colored gemstones is beyond compare,” Courtney says. “Any gemstone pairs well with platinum, but I’m excited about using platinum with green gemstones, like emerald.”
Source: NationalJeweler.com