guild-wars-2
In PvP, the amulet are used to summarised all the armour, weapon and Trinkets stats.
How did they come with the Rampager's Amulet
+284 Power
+798 Precision
+569 Condition Damage
+284 Vitality
Plus there is an upgrade in it adding:
+125 Precision
+75 Condition Damage
+45 Power
+45 Vitality
How can I get these stats with PvE armours?
Eh? Jewelers make Amulets.
I'm not sure what else to tell you. If you don't want to make one yourself (or can't!) check the Black Lion Trading House, or Karma Vendors, as I don't think Amulets are very common drops.
The accessory slots you see in the Hero Panel are from left-to-right, top-to-bottom: back, trinket, trinket, amulet, ring, and ring. Here's a picture of what you should see in game (notice the amulet bottom-left):
This may be something other than what you are looking for, but the main thing is going to be to practice. PvE can help to some extent, but you really need to just get in there and start playing. That's the only real way.
I understand you're possibly nervous about not being able to contribute for your first couple times in PvP or WvW, but that's really just how it's going to be. You will get much better much faster by actually playing. People probably won't even notice, and even if they do, it's just part of the game.
Beyond that, the biggest piece of advice I can give is to be familiar with your skills. You will tend to get nervous in PvP, moreso than in pressure situations in PvE. Make sure you are familiar with your CC effects -- which skills they're on, how they work, how long between uses, that sort of thing. Again, gauging how effective each skill is will only be able to happen through actual experience.
Other than making sure you know how to use all of your skills (with focus on CC), you'll want to practice kiting -- again, this is best done against other players, but you can try kiting mobs around as practice.
Familiarity with other classes/skillsets will help -- I suppose you could try playing with all sorts of weapons/classes/races so you will know ahead of time exactly what to expect from every opponent. Jumping right in will still be a faster way to gain this knowledge than trying to prepare without actually PvPing.
Best Answer
It is not yet possible to recreate the Rampager's amulet outside of sPvP.
PvP has different stat combinations available than in PvE. The Rampager's amulet seems to duplicate a set that is half Precision / Condition Damage / Power (Aka, the Rampager prefix), and half Precision / Condition Damage / Vitality , a combination that is not present on PVE gear. (if the link doesn't work, click "Show Filters" and try the link again) The Jewel (equivalent to PvE accessory upgrade slots) replicates these ratios.
Almost all level 80 gear in Guildwars 2 has a 3-stat combination, but not all possible combinations (including variations in the Primary stat, which there's always twice as much of) are in the game. The Halloween Event added in a new combination (Magic % / Power / Condition Damage ) of stats, so it seems likely that future updates may also fill in the missing distributions.