This is the luxurious "Bakst" silk reference by Designers Guild, available here in the Noir colorway.
Only one available
Measures: 139cmW x 115cmL
Composition: 68% Cotton 32% Silk
Its official description is: "A contemporary striped silk weave in brilliant colours with a soft washed finish. Distinctive spirals create depth within the bands of energetic tone. A favourite silk for its fusion modern Classicism."