The first few lines of the website:

"Bitgem provides a modular wallet enabling colored gems. Colored gems embody a built-in wallet colored coins, providing sending gems feature, and applying an automatic conversion between BTG and gems {DMD, RBY, SPH, EMD}.
BTG can be forged into Diamonds, Rubys, Sapphires or Emeralds, or abbrev. DMD, RBY, SPR, EMD. There are two processes implied:"

Does the following sound better? Or could someone else improve it?

Bitgem is one of the early cryptocurrencies, founded in May 2013. Only about 30,000 btg exist. While most coins are simple clones, Bitgem was designed to add an extra function. The Bitgem wallet can generate four different types of trading coin or gem, Diamonds dmd, Rubies rbs, Saphires spr and Emeralds emd.

As an American this sounds better to me.

Also there doesn't seem to be a working explorer. I'll pitch in a small amount if someone starts a bounty for one.