If you dream of a black agate it symbolizes health, power and strength. If you dream of a red agate it signifies healthy lifestyle, peace and freedom. This dream shows how blissful, auspicious and wealthy life you are going to have. It also could be a sign of happy marriage, good relationships or new start of your better life.
Dream dictionary: Agate dream meanings
To see agate in a dream, signifies a slight advancement in business affairs.
(Quartz, See Stone 2 )
It presages that we will suffer a short illness, but we will overcome it easily.