It is the zero hype coin. Even though it was one of the most original of the early coins it has no hype.

1) One of the coolest wallets. Even now few other coins have added extra tricks like creating new kinds of coins or gems.
2) Dev disappears but always comes back. He is sitting on the beach in Puri sipping Margueritas and every now and then he checks and sees if an update is needed. Most coins from that era the original devs are long gone.
3) Market cap is about USD 5k. There is no doubt it is a better investment at this price than almost any other coin.

But

1) Website has rough English and some toxic words like 'forge'.
2) No block explorer as far as I know.

Small amounts of bitgem keep trickling out at current prices so a person can buy slowly. There is not enough depth to buy very much though. About 4 bitcoin would buy the entire sell side of cryptsy. A waiting game right now.