CHARCOAL ( DARK GREY ) QUARTZCharcoal Dark Grey Quartz has a grey surface background and features a grained and slightly veined effect created by multiple dots. This stone goes well with white cabinets and can be used in both modern and classic style kitchens, to add a unique touch to your environment. Quartz is offered by Work tops in thicknesses 20mm and 30mm, with 20mm more suited to contemporary kitchen designs and 30mm better suited to more classic, country style kitchens.