According to puregold.io website and whitepaper.
1 EHT = 700 PGT
0.1 ETH is the minimum amount of investment during ICO

One of the recent updates,where we're making announcement about puregold being on Coss Exchange,starting trading on 15/3/18, also in contact with other Exchanges like Etherdelta, Hadex & Openledger .

From there, people will be able to buy/exchange PGT with other tokens and coins