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.