This email pretty much sums up what you should do with your twilight opals, forest emeralds, and sky sapphires (SAVE THEM FOR THE PATCH - HINT HINT).
With the newly announced mats for the Alchemist transmutes to make epic gems in the next patch there's a chance to probably make some very good money, the materials are sky sapphires, forest emeralds and twilight opals, all of which sell cheap on my servers (sapphires for as little as 5g per!). The transmute takes 3 of that particular type to create one epic gem (i.e.; 3 sky sapphire transmutes to 1 Majestic Zircon).
Even if you can't transmute them yourself I imagine the prices will skyrocket once people start stockpiling.
I'm definitely going to give this a go and see if it can make serious bank! :)
Sahiel - Medivh
EDIT: This post was prewritten weeks ago, unfortuneatley some of the information is outdated, here is a more accurate summary, thanks Hatch.
This information is outdated the current transmute materials are:* Red: Cardinal Ruby (mats: 1 Scarlet Ruby, 1 Eternal Fire)* Yellow: King’s Amber (mats: 1 Autumn’s Glow, 1 Eternal Life)* Blue: Majestic Zircon (mats: 1 Sky Sapphire, 1 Eternal Air)* Orange: Ametrine (mats: 1 Monarch Topaz, 1 Eternal Shadow)* Green: Eye of Zul (mats: 3 Forest Emeralds)* Purple: Dreadstone (mats: 1 Twilight Opal, 1 Eternal Shadow)