Hi, I have friends who have just come back from Sri Lanka, they are experienced at buying rough and cut gemstones and have had 5 or 6 trips to Thailand and Myanmar as well as a trip to India on gem buying
I do not know what areas they visited but;
they reported that the gem dealers they visited wanted ridiculous prices for their stone compared to what they have purchased in Thailand and Myanmar in previous years. last trip was 2016 to Thailand. subsequently they came back with virtually nothing.