Birthstone jewelry has become increasingly popular in recent years, but not everyone can afford the beautiful but expensive genuine birthstone gems. Synthetic birthstone gemstones are the solution. Just as beautiful as genuine gems, but at a fraction of the cost, these imitation gemstones allow you to create affordable birthstone finished jewelry. Esslinger carries imitation birthstones for every month from simulated garnets, the January birthstone, to simulated blue zircon, the December birthstone.