Yeah, I don't know too much about diamonds. I'm not sure how you move them quietly, like, at all.

The center of the diamond trade is in Amsterdam, and increasingly Mumbai (or Kolikat - I get the two confused).
You'd need a middleman in either city as the dealers in both cities are a small group known to each other. Harry couldn't just walk up to one with a pocketful and get anywhere. That being said, because the groups are small and close knit the sales are handshake deals, no written contracts.

Given the breadth of the White council and Harry's connections with Binder and Anna Valmont, he would probably be able to find contacts in both cities. Moving a few at at time, he shouldn't have too much problem selling them. He also wouldn't get retail pricing. He'd be more likely to get maybe 20 cents on the dollar value resale.

You can't shape or throw heat.

That's not exactly true. Magnetic fields can shape plasma (fire is low energy plasma) Superheated gasses and liquids can be thrown. Fire is just the most common form.
Similarly when Harry uses "Infriga" he's moving heat out of an object/area. In one case (White Night?) Where he drew heat from Lake Michigan and used it to fry (I'm blanking on whom)

I've been enjoying the Laundry books by Charles Stross, where magic is a function of higher math, and if you discover one of the functions that can summon one of the outsiders (he doesn't call them that) the folks from the Laundry show up and make you a job offer you (literally) can't refuse.

Tilly, now as a member of the Special Collections unit of the Library of Congress (the Loup Garou tape et.al.)

Or who loaded the gun for the Red Court and got Harry to pull the trigger on their own assisted suicide?

I've worked from the view that Martin had played the Red Court waiting for some opportunity (e.g. Harry, Susan and Maggie) The spell was WAY overkill.

The other possibility is that Uriel and Mab had a hand in the setup, in order to balance the sheets and demonstrate what happens to folks who dis the Winter Queen.

If you're looking for a big noise that without much damage that can be made from chemicals found in most school chemistry labs, look up the prep for Nitrogen triiodide. It's made from crystaline iodine and high concentration ammonia. It's been the naughty schoolboy's friend for a long time. Jerry Pournelle made reference to making some in the 1930s.

I'm not being clear because I don't know the correct terminology for what I'm seeing, so I'll just give some examples of what I'm trying to decipher.

I have 1 yellow square below my member name. I assumed that was a decimal code abbreviation for the number of posts (1 for 1 to 100, 2 for 100 to 1000 etc) but then I noticed that Ms. Duck has over 17,000 posts but only 3 squares. I was also wondering about the colors of squares, and why some folks have a paper icon by their post title, and others have what looks like a phone or radio.

I figured there was some kind of guide to what means what, and I was just too dim to find it.