At the end of the nineteenth century, yellow diamonds were most commonly encountered, if at all, in the Cape Province of South Africa. The term 'Cape Diamond'’ became generically employed for stones of a yellow hue, whose colour is created predominantly by clusters of nitrogen impurities within the crystal structure, causing colour centres and absorption lines. In general, these are the diamonds that fall into the fancy light and fancy yellow colour grades. However, in some rarer cases, in stones which make up only 1-2 of all mined diamonds and which are known as Type Ia diamonds, the impurities are much less frequent single nitrogen atoms. In these instances, the saturation of colour may reach an entirely different level of fancy intense or even fancy vivid yellow. Without doubt, vivid is the apogee of colour saturation on the grading scale, being the brightest, liveliest, rarest, and most valuable saturation of any coloured diamond.
Given the comparative rarity of vivid yellow diamonds, a stone weighing over 20 carats is a remarkable appearance on the market. Furthermore, this magnificent 21.40 carat diamond is not simply a vivid diamond, but one of a noticeably strong and fine saturation, even for a vivid colour grade and has, in addition, an internally flawless clarity with additional polish and symmetry grades both excellent. Within the world of coloured diamonds, one could call this heart-shape perfect.