Heads up...
Your not looking at pistil color to determine flower maturity. Those are the two white hairs extended from the calyxes. Calyx development is important when determining flower development. When at the end of its life cycle the pistils will shrivel and recede back into a swelling calyx.
I look at the stalk of the plant for the first pre flowers. If you watch them throughout flower they reach maturity well before the terminal colas. This gives you a glimpse at the size of a mature calyx, and is a good indicator of flower maturity when the majority of the calyxes reach this size on your terminal buds. When your to this point checking the maturity of the resin glands is critical.
What hxcplayer is saying is to check the actual trichome, the resin gland. At maturity, the color of the resin held in the capitate head of the gland determines readiness. Also, the size of the resin head should be bulbous in comparison to the stalk it is supported by. Size of resin glands will also vary between strains.
Hope that helps clarify. Dub