Mosaics were used since antiquity to decorate floors and walls. Coloured natural stones such as marble and limestone were cut into small cubes, called tesserae. The Romans often used mosaics, the designs ranging from fairly simple geometric patterns to extremely large and complex representational scenes. Later on, during the middle ages in Byzantium, an important innovation took place: instead of natural stones, coloured glass tesserae were created. To make golden tesserae, gold leaf was sandwiched between two layers of clear glass. This innovation created a much more intense, colourful and luminous effect, many examples can still be admired around the Mediterranean today. When Renilde visited Monreale in Sicily for the first time in her early twenties she was struck by the beauty and intensity of the colour and the gold. Thinking of the elegant mosaics on the small columns of Monreale, Renilde created tesserae in gemstones. Sugarloaf cut gems are set in a gold bezel and can move in the jewel. In the ring, the gem-tesserae move around and in the hanger the gems glide into a pattern of your own choice, as a sliding puzzle.