Hello from Russia! It is impossible to determine the maturity of marijuana by the color of trichomes, everything is accurate, guess on the coffee grounds! No microscope will tell you when to assemble. It is easy to notice by eye! Even when the above trichomes become marijuana amber color, they can continue to gain weight and density of the flower. Watch the maturation of the white antennae on the inflorescences. As soon as the new antennas cease to be born, and the old ones turn brown or opal, then your plants are ready. Judging by the photos from your diary, you need to grow at least 4-5 weeks. Do not rush to harvest early. In a few weeks, the most important plants in life. I hope I helped you!