Gem Surfaces® Slabs Specifications   TRANSLUSCENT BACKING GRANITE BACKING ALUMINIUM BACKING SOLID SLABS SOLID 20MM LAYERED 30MM GEM LAYER (mm) 5 10 5 10 5 10 20 20-30 BACKING LAYER (mm) 20 20 20 20 10 10 10 0-10 LENGTH (mm) 1250 1250 1400 1400 1400 1400 1400 1400 WIDTH (mm) 2500 2500 2500 2500 2500 2500 2500 2500 SQUARE METER PER SLAB (m²) 3.125 3.125 3.5 3.5 3.5 3.5 3.5 3.5 GEMLAYER(inches) 0.20 0.39 0.20 0.39 0.20 0.39 0.79 0.79-1.18 BACKING LAYER (inches) 0.79 0.79 0.79 0.79 0.39 0.39 0.39 0-0.39 LENGTH (inches) 49.21 49.21 55.12 55.12 55.12 55.12 55.12 55.12 WIDTH (inches) 98.43 98.43 98.43 98.43 98.43 98.43 98.43 98.43 SQUARE FEET PER SLAB (ft²) 33.64 33.64 37.67 37.67 37.67 37.67 37.67 37.67