I made my tattoos rings with black nail polish but I don't recommend because it probably will peel off. Try henna or some special ink. I really don't know where to buy henna but I will look for it soon.
Nail polish isn't a too bad idea if you want to wear them for just 24 hours.
Details: Phillip Lim AW - 2012/2013 (nowfashion.com)
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