Why don they cut very small Blue Topazes or Aquamarines?
I call it the “seawater effect”. The ocean is an incredible blue until you scoop it up in a glass, and then you think it is completely colorless. Same for many colored gemstones. Blue Topaz, Aquamarine, Peridot, Citrine, are a few that lose so much color when cut to tiny sizes that it’s not worth cutting them.