I told Fishura what I needed to make a Platinum Ingot, and he went ahead and bought a stack of Platinum Nuggets and a Platinum Ore, which puzzled me, since this was a whole 20k more expensive than just buying one off the AH! He said it'd take too long to buy the Nuggets off the AH one at a time, so >_<.
I didn't take the specific time into account, but I know it was in the last few hours of Earthsday, since I was kinda trying to hurry Fishura up before it turned over to Watersday, and I would have greater chance of breaking his materials.

As it turned out, the first attempt failed, and fortunately, only four Platinum Nuggets were lost. The second time went fine though, and Fishura let me keep the leftover Nuggets.
This got me wanting to skillup again, and so, while I normally wouldn't do this, bear in mind that I had been gone from the game for a month, and in addition to that, because I will be going on holiday tomorrow, I have not been able to grow any Platinum Nuggets for my consumption. And so, I decided to satisfy my impulse for skilling, and bought five stacks of Platinum Nuggets off the AH for 349k total. In combination with the extra stack of Platinum Nuggets I had from the last skillup session, I now had just enough to last exactly twelve synths- enough to quell my need to skill, and not so much so as to break my walletaru. >_<
I also incidentally, picked up one more Platinum Ore off a random mining trip to Oldton Movalpolos, but due to my philosophy behind farming materials to "save" costs, (it doesn't save you anything), I'll count it as though I bought it off the AH.
The starting conditions for this skillup session were:
Starting Goldsmithing skill: 61.0
Skillup synth: Platinum Ingot (cap 64)
Imagery Support: None
Equipment of note: Shaded Spectacles, Vulcan's Staff
Direction: North
Location: Mog House
Moghancement: Powerful Fire
Moon phase: Windsday, Waxing Crescent (17%)
61.0
06:10 Success.
06:23 Success.
06:36 Success, +0.1!
61.1
06:50 Success.
07:02 Success.
07:16 Success, +0.1!
61.2
07:39 Success.
08:00 Success, +0.1!
61.3
08:14 Success.
09:52 Failed- lost 3 Platinum Nuggets.
10:06 Success, +0.1!
61.4
10:19 Success.
And then my twelve synths was up. Too bad for the break, otherwise I would've had a very nice stack to add to my mule's collection, but since I had nine loose Ingots in Storage, I just shipped one over and the stack was complete. ^^
Over the course of today, including Fishura's synths, I used up a total of 14 Fire Crystals, 79 Platinum Nuggets, and 12 Platinum Ores. Current AH prices for these are:
Fire Crystals: 5k/stk
Platinum Ore: 50k/ea
Platinum Nuggets (12): 70k
Doing the math, that's 1,066,667 gil out to make a total of twelve Platinum Ingots, or one stack, which sells for 1.1m at the moment, leading to a 33,333 gil profit (although 20k of this would normally get taxed if I chose to sell to AH). However, of all this, I only actually spent 399k on my own ingredients.
The skillup rate seems to be fairly consistent, skilling up once every three synths. It shouldn't be too much longer before I hit 62, although I'll get around to that once I get back from my trip. ^^
Summary:
Today's accounts: +33,333 gil
Amount invested from 60.0: 4,834,240 gil.
Overall cost from 60.0: +54,044 gil.
Overall cost from 61.0: +33,333 gil.
