Inclusions are internal imperfections in a diamond, such as a spot or any other irregularity. Irregularities may include a fracture, a smaller diamond in a larger one, liquid and so on. In diamonds with an SI-3-purity (low quality), the inclusions can already be observed by the naked eye. In diamonds with a higher quality, the inclusions are only visible with a magnifying glass. Most inclusions arise when the stone is formed beneath the earth's surface. The fewer the inclusions, the higher the purity, the rarer the diamond and the higher the price.