Yes, but its not the color of the pistils as chitownsmokin stated. When looking for ripeness in Sativa it is better to harvest when 30% cloudy and 70% clear, this wil give a higher soaring stone, which will accent the strains (sativa) natural high. For indica 50/50 cloudy clear, this will add to the body stone which indica strains naturally produce. The window for harvest is 5-7 days so watch close.