DiabloFans

from 1.07 patch notes:

Crafting Plans and Jeweler Designs have been added for all of the new Rare recipes listed above
These plans (excluding the chest piece) will drop randomly in the world and have a chance to drop off the following bosses when you have 5 stacks of Nephalem Valor:
Skeleton King
Spider Queen
Maghda
Zoltun Kulle
Ghom
Cydaea
Rakanoth
Izual

so do ur usual farming route but keep in mind the mini-boss present in that act.

As a further point of clarification: while those 8 sub-bosses have an increased chance to drop crafting plans when you have 5 stacks of Nephlem Valor, they do not have an increased chance to drop gem designs.

We answered this question in the recent "Ask the Devs" post. You can find the full post here, but I will quote the part that concerns your question:

Andrew: We love that players are able to remove gems from sockets in Diablo III, as it helps provide more flexibility as you gear up rather than locking you to single choice. However, since un-socketing is so painless and costs so little, what we've found is that players will simply recycle the same gem across all their characters rather than creating new ones. An important goal with the new Marquise gems is to act as a gold and Radiant Star gem sink. Currently, there's nothing in the game that actually pulls those gems out of the economy, but to keep their value up, that's important.

In all honesty, I wish the cost to remove the lower tier gems was much higher, more in line with the cost of the Marquise gem. We would prefer players to be crafting new gems of all types rather than just shuffling them around as that makes the gem economy more dynamic (more things coming in, lots of things coming out). Right now it's almost entirely stagnant, with demand going down every day. If you only had to craft one Marquise Ruby for all 10 characters, that would remove some Radiant Stars from the economy, but realistically it won't remove much. With the unsocket cost set to 5 million, you now have a clear choice: "should I move my gem 4 times or just craft a new one?" For the sake of the economy, we actually hope you'd prefer to craft a new one.

So to answer your question as to why the cost is so high to unsocket marquise gems; it's not for the reasons you listed, but to act as a gold sink, but also to stimulate the gem economy because at the moment it's quite stagnant.

Agree. I've never had more than 3 millions...
This would generally mean that you are not going to be able to buy or create a Marquise gem to begin with sadly. A marquise gem costs 20 million to make, and this is not including the other required reagents.

Also all your sad smilies suggests you don't appear to agree with it either since most people wont be able to afford that.
No, it was a sad smiley because I was telling Manif that creating or buying a Marquise gem might be too expensive for him at this time, given his comment.

This week's Community Commentary shout-out goes to Dat Modz and his "fastest" farming route for the new crafting recipes added in patch 1.0.7.

Looking to collect all the new account-bound crafting recipes, but don't want to use the Auction House? Dat Modz has got you covered with a route he's dubbed “the fastest way to acquire BoA item plans." According to this popular Twitch streamer, the route could potentially yield you a crafting plan in just about 1 minute and 30 seconds!

Here're the details:

• MP = Whatever you are comfortable with/Most Efficient
• Kill Ghom Quest (Keep Depths 3)
• TP to Keep Depths 1
• Zone into Keep Depths 2(Kill all elites ignore white mobs)
• TP to Keep Depths 3(Get Final Stacks)
• Kill Ghom

For those of you who prefer visual guides over text, you're in luck! DatModz also has a video of this route from his testing on the PTR:

Did the video help you decide how you are going to find the recipes? Have you found a faster route to farm them? Leave a comment below with your thoughts, or head over to reddit to comment in Dat Modz's original post on /r/diablo!