assuming you purchased dia's on dbl dia. time... 12,000 Dias (2 times the $100 option)
On Reni an under dura Puppet Queen is around 60mil gold (cheapest I've seen it) and dias are around 50k per... so there goes 1,200 diamonds and you have a weapon. [10,800 left]
Next up lets T10 said weapon. If you wait for the sale of 1,000 AT charges for 1,000 dia's, and 100 AT charges for 100 dia's... you'll need to buy 3,300 charges at 3,300 dia's [7,500 left]
Left out of the charges above are the cost of the fusion stones (2,187 stones @ 1,900 gold... AND 2,187 T4 vendor belts @ 3,455 gold). We'll round down to 11.7 mil gold ~ 235 dias sold [7,265 left]
If you can wait out for the last +16 jewel sale it would be 209? diamonds per package (which will get you from +12 to +16)... At this point you would use up your rubies you've made to get the weapon to +12 after using the extra items from this package. Total cost 836 dias [6,429 left]
So best case scenario it will cost right around $100 just for a plus'd and tier'd weapon (which will need replaced every 6 months). If half your budget is used on one item... not gonna happen. Especially if you have more than one weapon. Recently a Juggler Cape sold for 300 Million... there goes your remaining 6,000 diamonds.
Sorry for the wall of text, but in Raven's defense, if you spent $200 on the game, you could get yourself decently geared enough to run the mini's to sell stats and start raiding and get accustomed with the game and slowly make your way to end-game... but be prepared to spend a lot of time in the game, because if you are not keeping up fast enough, the next expansion will only put you even further behind.