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You can craft 5 Quality Tuning Crystals by combining 6 Piles of Incandescent Dust. Determining profits for this kind of crafting is pretty easy, so it always surprises me how many people miss this opportunity (and dozens of other ones like it).
Let's look at the math behind it, shall we?
6 Piles of Incandescent Dust ~ buying for 7 silver
5 Quality Tuning Crystals ~ selling for 10 silver
Profit = 1.5 Silver
That's a 21% profit! Like all things your mileage will vary, and I highly recommend that you explore additional markets on your own. In a few minutes you'll discover plenty of crafting opportunities right now, and I think that's because people have written them off for months only to miss out on tons of gold!
By the way, this tip comes from Draco4444 on the forums. He's been buzzing about lots of crafting opportunities lately and I think he deserves a big shout out on here. Thank you Draco!