Blue Green Gneiss Hand Hewn Slabs 15L. The product is available in free length and slab thickness 1.5 cm - 2 cm. Hand-hewn gneiss looks exquisite in any interior and exterior project. The material is suitable for overall and decorative cladding and combines very well with various plasters, metal, wood and other types of natural stone. SIM2007 - natural gneiss stone at top prices in Sofia. Order from us - fast and secure delivery to your address. Large stocks and lower prices for distributors and builders.