This is a remix of one of the files from: http://www.thingiverse.com/thing:26334. I added a ring to the heart so it can hang on a necklace.

You can buy 3D printed variations of this in my Shapeways shop: https://www.shapeways.com/shops/3dwp

This is a heart shaped pendant, the one in the picture is made on a Form 1.

--> Edit 03-26-2014: I added a model with some support beams. hope they help with printing on an FDM machine. <--

--> Edit 09-28-2014: I replaced the version with support beams, I have tested it and now it works on my Up Plus. I changed the thickness and amount of pillars and now the heart will print without extra support. <--

https://www.3dwp.nl