Hi, in regard to good quality Sapphire Ruby and other gems, price does depend on size of the gem for instance
do not take these prices literally THIS IS JUST AN EXAMPLE as I do not know what price per carat Kashmir blue is???
Kashmir blue sapphire top quality cut gem
up to 1 ct $1000
next 2 cts $2000 per carat
next 2 Cts could be $3000 to $4000 per carat
top quality gemstone does not stay the same rate from 1 to 5 carats