Best gems on Cryptopia right now are GCC and OPC.
GCC - has already working product, 7.8 mil cap, big new end of month - whitepaper and news about excahnges, check this article:
https://steemit.com/bitcoin/@mrgray/gcc-the-guaranteed-8xOPC - really really undervaluated coin right now, its a very best PoS, and on May 29th there is a swap possible from OPC to OPCx - newer coin with masternodes - also both OPC and OPCx will be added to new exchange - coinexchange - DYOR but thank me later