Actually, in my experience, the price does not go up. In fact, in Hellscream-EU, the price of 1 eternal earth is only 3-4 gold, really freaking cheap. therefore, I can buy gems that are 1-1.7g ea, and still make about a gold profit. for each ring/necklace. But, one thing I DID notice was that every time I bought a lot of gems at once, the prices went up, and stayed up until the weekend. I would advise everyone to only buy gems in the weekend, as many people use auctioneer, and they post their auctions based on the prices that are listed.