I think you are going to find that Chatham is premium syn.
emerald and doesn’t even wholesale below 80/ct cut, or about
$30/ct rough, if you can find it. sounds prohibitive to me for
what you describe. You might try some of the Russian companies
for their hydrothermal emerald, which, I’m told, goes as low as
$6/ct in the rough. You might also explore other synthetics of
simlar color, but they probably won’t be included. Could be as
low as five to ten cents a carat in the rough, tho’. HTH