Did you get caught up in the hype?
Some sites were promoting the possibilty of an epic gem transmutation cooldown removal. Other people interpretted what was only a possibility as an actual truth. Let us not forget that you can't believe everything you hear. Anything is subject to change or could be just speculation.
What can we learn from the alchemy cooldown removal fiasco?
Becoming fluent with working the auction house takes more than just following specific advise. A true auction house player understands various elements of the auction house. Figuring out what will sell better at what times is a big part of the puzzle. Forecasting and speculating also can read huge rewards. In order to be wise about investments you only want to invest in changes that have a very slim chance of not happening. Stick to blue posts by Blizzard officials that you can count on. If a site promotes something that is speculation, remember that it is just that - Speculation.
Divide and Conquer
Some people got caught with a massive stockpile of eternals for use when the cooldown was removed from alchemists. When it wasn't removed, they were stuck holding onto mass quantaties of rare gems and eternals. Some auctioneers may not recover from these investments. Expecting to see some eternals flooding the market soon. I can't preach enough about diversity. By playing multiple markets, you can cushion a big hit in one market because your other markets continue to provide income. The gem and glyph markets should continue to provide increased sales through this weekend as some players are still fumbling to get the patch installed and log in. The weekend population should be the biggest it has been in a while, so be prepared in all markets.