White diamonds are the classic colour and the most popular for jewellery, especially engagement rings. However white diamonds vary in shade on a colour scale of D - Z, with D referring to completely Colourless diamonds which are of the highest value. Most diamonds exhibit traces of faint or light yellow, so colourless diamonds are highly rare. On the other end of the scale are fancy coloured diamonds, such as deep yellow, pink or blue diamonds, which are also incredibly rare and valuable. Black diamonds, renowned for their mysterious allure, reside on the opposite end of the spectrum. These enigmatic gemstones, with their captivating dark hue, offer a unique and distinctive choice for those seeking an unconventional touch of elegance.