6 inch tiles
The rectangular 6 inch x 2 inch glazed fireplace tiles became popular for fireplace hearths around 1900, and they were still in common use for fireplaces into the 1960s.
The earlier tiles were hand produced, with a variation in intensity of colour shading within and between tiles. The arched fireplace insert in which they often feature was the single most popular choice of fireplace insert from 1900 up until the beginning of the Second World War in 1939.
After 1945, the square 6 inch fireplace tile format came more into use, and is still being used as a standard in the fireplace industry.