Echinopsis chamaecereus 'Violet' - Peanut Cactus hybrid
This cactus has stunning flowers on columns with prickly spines. The flowers are irridescent pink leaning towards purple tones. Each flower lasts for one day but more coming. The plant grows lots of segments and will form a clump, or you can remove and root segments to grow more plants.
Last pic shows 'Violet' (left) and 'Rose Quartz' (right) together.