Perfect answer man. I needed this little info too. Thx DDTheir is a sticky on this thread title harvesting-a tutorial, by fdd. This info is from it.
we will start with ripeness. most people say to check your trichromes with 30X magnification. i have other ways. when buds are done they look "done". the appearance of the bud changes. the leaves start to hook upwards and become hard and crispy. the calyxes will swell and the hairs will turn brown. you can see a golden tinge to the bud leaves. this is the amber crystals. they start to turn amber on the leaves first.
not ready..........
ready.......
notice the difference? it's pretty easy to see once it occurs.
https://www.rollitup.org/do-yourself/254814-ultimate-diy-carbon-scruber-under.html