Since there are more threads asking about the rotation of the stone guards in 10 men, here's a small guideline (currently, it's just speculation, but after looking at some logs it appears to be true):
1) Amethyst, Cobalt, Jade (was 1st EU week)
2) Amethyst, Cobalt, Jasper
3) Amethyst, Jade, Jasper (was 1st US week)
4) Cobalt, Jade, Jasper
So for this week (3rd ID), we will have Amethyst, Cobalt, Jade for US and Amethyst, Jade, Jasper for EU.
Maybe someone wants to create a little script that shows the combination of adds for the current week?