sapphire

check the rare material trader

Are they getting easier to find, or what? beacause they are going down in price at trader, and still no one's found armor/items that use sapphires or rubies?

does the strategy guide say anything about them?

no armors use them..

I think when I posted they went down from 5.5 or wahtever, to maybe 4.5 or 4k. Now they are at a whopping low 2.5k

Now sure, there's no armor that needs them, but we all know they will be used for something...
The only reason I'm not spending a good 100-300k gold buying as many as I can of these, is because I'm not a greedy pig (and I also don't have the willpower to withstand loosing that much gold in case somethign goes awry and their value plummets). I have a good amount of money already... and I've had this money for like 10 months (when I last stopped PvEing mostly)... I don't see how I'll ever need more if I still have that (not to mention I also have a good share of candy canes, potions, fissure armor, and most importantly many rubies and sapphires already).

So yeah, Master Xapti's advice: go buy some if you have some spare change!