The best replacement for diamond is cubic zirconia.

The best alternatives to diamond are rated as following:
★★★★★  cubic zirconia
★★★★  moissanite
★★★★  white sapphire
★★★★  pearl
★★★  cz
★★★  graphite
★★★  chakrabarty
★★★  emerald
★★  rhombus
★★  iphone
★★  platinum
★  gold minecraft
★  gold
★  ruby
★  sapphire
★  simon
★  glass
★  platinum pokemon
★  omnia
★  sedaka
★  crystal microdermabrasion
★  cirrus
★  pearl better
  fake
  emerald more expensive
  low
  square
  zirconia
  white diamond
  princess
  quartz
  stone sharpening
  kraftmaid
  pearl which is better
  bronze
  touch pro
  palillo
  graphite structure
  pearl pokemon
  cubic
  zircon
  crystal
  scanpan
  visiontek
  insec
  fake diamond
  princess cut
  young
  cubic zirconium
  ceramic sharpeners
  pokemon pearl
  stone sharpener
  rhombus shape
  summit white
  blair

Your alternative for diamond is not listed? Suggest!
Speaking about diamond, one probably shouldn't forget about sapphire ring.

Other search terms related to diamond and their ratings are:
★★★★★ sapphire ring
★★★★ question mark
★★★ rings
★★ ring
★★ sapphire
★★ setting
★ question mark in it
★ action replay
★ sapphire engagement rings
square halo
diamond
cert
You have in mind a companion for diamond and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of diamond in all years. Click on graph for more.
diamond
cubic zirconia
moissanite