Gold Cluster is not rare, its a common drop. You can currently buy them for a silver or less during busy times of the day.
Rares:
T1: Bronce, Lapis, Copper, Yarrow, Alder, Low Quality Pelt
T2: Blackened Iron, Silver, Coral, Sisal, Severed Bone, Average.
T3: Steel, Jasper, Palladium, Dandelion, Fir, Medium
T4: FaySteel, Opal, Ruthenium, ? ? Cant remeber the Woods.
T5: Ebon, Ruby, Rhodium, Figwarts, Cedar.