The top three quartz countertops on the market are Caesarstone, Cambria and Silestone. Caesarstone was the original producer of quartz, however they failed to patent the process and therefore, Cambria and Silestone were able to duplicate their production methods,... 
The Difference between Granite and Quartz: Quartz is harder than granite and therefore more durable. Diamonds are one of the few minerals harder than quartz. The Mohs Mineral Scale of Hardness lists diamonds as number 10 and quartz as number 7. (Source: Wikipedia... 