First of all:
in 4.1 appears that small gems will drop down from 9 gold to 75silver at NPC ( mmo-champion source)
So craft it now to sell it now and not after 4.1 common sence.
Its like maelstrom crystal its logical.
Sell quick before 4.1: Alicite Carnelian Hessonite Jasper Nightstone Zephyrite on AH or craft and sell it to NPC
Then :
At every patch people will get new stuff so prepare to stock some rare gems the price will rise. or buy some and resell it after patch
Stock for resell after 4.1 : Amberjewel Demonseye Dream Emerald Ember Topaz Inferno Ruby Ocean Sapphire ( crafted will give you more profit of course)
At the End :
You can make profit before 4.1, lots of people have a lot of chaos orb and the price of some ore or volatil or leather are very very low so you can craft epic item for about 400 to 800gold easy way. So quick craft some and quick sale some Maelstrom crystal before patch release.
For example :
Chestguard of Nature's Fury
Pristine Hide (3) between 300 and 600 gold
Volatile Life (50) 100 - 200
Chaos Orb (3) 100 - 200
To craft it cost you between 500 and 800gold and and maelstrom directly sell on 1k to 1k5
It depend on server of course ( i took price on mine ) but the idea is here normaly you can find epic craft that cost you nothing and can quickly resell it before patch.
Watch and try.
If you have questions ? just ask