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It is agate. Agate is quartz deposited at low temperature (100-500°F) in layers. The fact that someone put it into a tumbler and smoothed the surface (or that the smoothness may even be natural - wonder of wonders - rules out any softer pinkish hued material. Rose quartz forms at higher temperatures, usually in hydrothermal veins.
Theres no such thing as banded rose quartz to my knowledge
Rose quartz is not popular as a gem – it is generally too clouded by impurities to be suitable for that purpose.
I used to dig quartz crystals out of a layer of ground in West Virginia. They were crystals and have lots of mud and water inclusions and are a nice smoky brown color. Though many are perfectly clear and double terminated. The layer is about two inches thick and is between two layers of sandstone. It never occurred to me that they could be a form of agate.