Getting materials for raising your professions is easier than you could have ever imagined in Swtor. With the Crew Skills feature they have in the game you can gather materials for any profession while doing anything. All you need in order to make this work is a few credits, some spare time, a companion and to follow these simple instructions. I recommend that you read this guide if you're not familiar with how missions for Crew Skills work.
Now the best way to gather materials for any profession is by running missions. There are 5 or 6 missions available to you through each Gathering Crew Skill and for most Mission Crew Skills. You will always want to run the higher Yield Missions first when it comes to gathering materials this way. Below is a look at one of the missions that will reward you with Blue Polychromic Crystals.
This mission is worth running if you need Grade 6 Color Crystals. You will be rewarded with either Red, Green or Blue Grade 6 Crystals for completing this mission which can all be used for recipes that involve Artifice. If you're a Synthweaver you will want to be running Power Crystal missions instead.
Note: Also since this mission rewards an "Abundant Yield" I recommend running this before any "Moderate Yield" missions.
Blue Polychromic Crystal - Color Crystal
Red Polychromic Crystal - Color Crystal
Green Polychromic Crystal - Color Crystal
In addition to acquiring the Blue Polychromic Crystals through running missions you can also gather them the old fashion way, by actually going to a planet that has nodes of those items. For Grade 6 materials there are only three planets players can go to, Ilum, Belsavis or Corellia. Ilum offers the most nodes out of all three planets although it has a tendency to get over crowded as everyone knows it is the best planet for farming these materials.
I will be posting an update soon with more information
Blue Polychromic Crystal Farming
This page will be further updated as time goes on specifically for each and every item. Please bear with me as Swtor is still extremely new, I am working very very hard on getting as much done as possible.