I personally think so far Ringcrafting is the fastest way to get to a mastery in a crafting skill/Profession
To max out any profession you need to get the skill to 250 points you get 1 point per recipe you make at your tier in that profession.
The items needed to max out Ringcrafting the most cost effective way are:
50 Primordial Flame
First you will need to make a Ringcrafting bench at the Adventurer's Crafting Bench (you will do this during the tutorial quests in the top right hand corner) this will cost 5 flux and 30 shapestone.
Place this bench and then between the below following levels make:
0-50 - Make 50 lots of Diamonds ( 250 diamonds in total - keep these as you will need them later)
50-100 - 50 x of any kind of Shard Box
100-150 - 50 x of any kind of Band Box
150-200 - 50 x of any kind of Ring Box
200-250 - 50 x of any kind of Loop Box
Congratulations you are now 'Lord of the Rings'
I hope this helps, please leave any improvements in the comments before voting negative.