These beads are handmade, so sizes are approximate and can vary from strand to strand. There may occasionally be broken, poorly shaped or mis-drilled beads on a strand. Some beads may be C or B quality and/or color enhanced. Please be aware that almost all commercial garnet used for beads is dyed. All strands are 14 to 15" in length.
As you can see from the picture, 'Diamond shaped' is kind of a loose term for the shape of these beads. The garnet is fairly clear though, and the sizes are similar.