The best replacement for emerald is ruby.

The best alternatives to emerald are rated as following:
★★★★★  ruby
★★★★  sapphire
★★★  jade
★★  diamond
★★  seeker
★★  fire red
★  sapphire pokemon
★  aquamarine
★  princess cut
★  firered
★  leaf green
★  duration
★  ruby diablo 3
★  ruby and sapphire
★  sapphire more expensive
★  peridot
★  radiant cut
★  diamond minecraft
★  ruby d3
  diamond more expensive
  radiant cut diamond
  empire zoysia
  asscher
  radiant
  zeon zoysia
  zenith zoysia
  crystal pokemon
  metacity
  cheats
  compiz
  chrome diopside
  palisades zoysia
  agate
  tsavorite
  chrysoprase
  diamond ring
  asscher cut
  gtk
  green tourmaline
  myers zoysia
  ruby pokemon
  tanzanite

Your alternative for emerald is not listed? Suggest!
Speaking about emerald, one probably shouldn't forget about compiz.

Other search terms related to emerald and their ratings are:
★★★★★ compiz
★★ gameshark
★★ cheats
★★ blue sapphire
★ yellow sapphire
★ diamond engagement rings
You have in mind a companion for emerald and it is not yet here? Propose!



Google Trends

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emerald
ruby
sapphire