I have a Murano Sculpture it is in Calcedonia Glass Pale Olive Green With other shades running through it and made by Loredano Rosin. It is signed on the base. It is a seated lady with her arms resting on her knees with her head tilted slightly to the side. It was bought 38 years ago at the Murano Factory in Venice. We live in South Africa and have no real experts to valuate this. It is in mint condition. Please can you help us.