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Cheeky's website lists Thigh Highs as a dark pewter but it definitely gives off a bit of a metallic purple gold as well.
I used a base of Cheeky Monkey Wet Dream, 2 coats of Thigh Highs and a top of Seche Vite.
In the sun, this color looks a little more purple than pewter but there's always the shade!
In the shade, there's a bit more of a brown tone in there but I'm not sure how close it really is to Rihanna's nails. It seems a little too purple to me. Sorry Ericka!
Cheeky Monkey can be purchased on their website [official website] for $15 a bottle.