It broke 2 days after I got it? It looked so good though and I'll just see of the company can replace it.It broke twice with in the first hour of my wife wearing it. Buy something better quality.THIS IS NOT A CAFFEINE MOLECULE. I should have realized before purchasing this necklace. Caffeine has three methyl groups, but this necklace only has two. The molecule on the necklace is THEOBROMINE which is a bitter alkaloid of the cacao plant. Theobromine is found in chocolate as well as many other foods. Hey, I love chocolate, so that is cool, but it is NOT CAFFEINE just FYI.Beautiful, wore nicely. It did break after wearing on the third day. Just need jewellers pliers to open the ring to re-link.I bought this as a gift for a friend who doesn't normally wear jewelry, and she's worn it just about everyday since then. It also helps that she loves coffee. I thought it looked cool, and she liked the simple yet classy design. It was not so simple that it was plain, but it also is not so big and flashy that it draws too much attention.The only thing negative about this is that its not actually the symbol for coffee, which I knew when I bought it. Its a gift that I think my neice will love, so I havent seen it on her yet. I would have liked it more if it were accurate!I love this necklace. The design is very simple and elegant, and the shiny black color is just wonderful. I haven't had any problem with my skin in the 3-4 day I've been wearing the necklace (as with another metals). I'm a fan of molecule jewelry, so I hope Rosa Vila continue developing this line.Unique necklace. We did have to close a loop by the charm, but chain and charm are holding up to being worn daily.Impresiona y es un buen regalo, lo recomiendo mucho mas para aquellos amantes del. Café...