Tiffany & Co Sugar Stacks by Paloma Picasso in silver with black onyx T 48 Silvery

Tiffany & Co ring. Sugar Stacks designed by Paloma Picasso with a black onyx stone. She is still on the site at 460 euros: https: // www.tiffany.fr/jewelry/rings/palomas-sugar-stacks-ring-GRP07846?fromGrid = 1 & origin = search & trackpdp = search & fromcid = -1 & trackgridpos = 3 On the site the ring is described as: "Sumptuous colors to wear alone or superimposed. Silver ring 925 thousandths and black onyx. Total carat weight: 8,00. Original creations, all rights reserved to Paloma Picasso."
The ring has been worn but has been polished. The signature is still present on the inside of the ring but it is difficult to see. You have to search with a jeweler's magnifying glass.