Each is available on either gold or silver, and can be had as Mod/Copy, or Mod/Transfer
Each has a different style of chain and here are some sample pictures:
Celtic Heart, on a very fine chain and featuring a very unusual celtic style knot made of intertwining open hearts:

a closeup of the knot:

Double Heart - big and more modern styling with intersecting hearts and on a heavier chain:

Inward Heart - one heart within another, on a medium chain:

Pearl Heart - a beautiful ivory pearl inside an open heart, on a delicate chain fitted close around the throat:

Slurl: direct to Dellybeams Gem Gallery in Goun
While you're there, don't forget to step outside to the courtyard where I've put out a sidewalk type sale of all my prior heart jewelry. The prices are slashed to well below half their originals and when Valentines Day has come, I'll be retiring most of those to the big prim farm in the sky, so now's the time to pick up pieces you might have wanted before!