The best replacement for diamonds is cubic zirconia.

The best alternatives to diamonds are rated as following:
★★★★★  cubic zirconia
★★★★  pearls
★★★★  cz
★★★  moissanite
★★  rubies
★★  real diamonds
★  natural diamonds
★  sapphires
★  non certified
★  white diamonds
★  emeralds
★  fake
  fake diamonds
  zirconia
  cubic zirconium
  silver ferns
  crystals
  clubs
  swarovski crystals
  cubic
  regular diamonds
  botswana
  gia
  sapphire
  stones
  diamonique
  spades
  gems
  rhinestones
  non enhanced

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

Other search terms related to diamonds and their ratings are:
★★★★★ fluorescence
★★★ blue fluorescence
★★★ prongs
★ strong blue fluorescence
You have in mind a companion for diamonds and it is not yet here? Propose!



Google Trends

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