PoW scrypt and PoS like NovaCoin, but adapted to gem's character, providing semi-scarce, precious and highly valuable currency properties. Mining a block you could to get up to 3 BTGs.
BitGem (BTG) Features
Technology Specifics for BitGem (BTG)
BitGem (BTG) uses the Scrypt algorithm and relies on the PoW/PoS proof type.