Whilst this is a grey amethyst cluster, the centre area has a very light violet hue.
The red blob is actually a small red area near the base.
It is a lovely piece of amethyst and comes with a detachable stand so that is can be mounted if you choose.
It measures approximately 15.6cm, whilst the width is about 9.5cm and the depth is about 7cm.
Please double check the size and the photos before you buy.