Diamonds occur in a variety of colors — steel gray, white, blue, yellow, orange, red, green, pink to purple, brown, and black, virtually in every color of the rainbow. Colored diamonds contain interstitial impurities or structural defects that cause the coloration, whilst pure diamonds are perfectly transparent and colorless.A chemically pure and structurally perfect diamond is perfectly transparent with no hue, or color. However, in reality almost no gem-sized natural diamonds are absolutely perfect. The color of a diamond may be affected by chemical impurities and/or structural defects in the crystal lattice. Depending on the hue and intensity of a diamond's coloration, a diamond's color can either detract from or enhance its value. For example, most white diamonds are discounted in price when more yellow hue is detectable, while intense pink or blue diamonds can be dramatically more valuable. Out of all colored diamonds, red diamonds are the rarest. The Aurora Pyramid of Hope displays a spectacular array of naturally colored diamonds, including red diamonds. Diamonds occur in a variety of colors — steel gray, white, blue, yellow, orange, red, green, pink to purple, brown, and black, virtually in every color of the rainbow. Colored diamonds contain interstitial impurities or structural defects that cause the coloration, whilst pure diamonds are perfectly transparent and colorless. Diamonds are of two main types and several subtypes, according to the nature of impurities present and how these impurities affect light absorption. Type I diamonds have nitrogen atoms as the main impurity, commonly at a concentration of 0.1%. If the nitrogen atoms are in pairs, they do not affect the diamond's color; these are Type IaA. If the nitrogen atoms are in large even-numbered aggregates, they impart a yellow to brown tint. About 98% of gem diamonds are type Ia, and most of these are a mixture of IaA and IaB material: these diamonds belong to the Cape series. If the nitrogen atoms are dispersed throughout the crystal in isolated sites, they give the stone an intense yellow or occasionally brown tint of Type Ib; the rare canary diamonds belong to this type, which represents only 0.1% of known natural diamonds. Synthetic diamond containing nitrogen is Type Ib. Type I diamonds absorb in both the infrared and ultraviolet region. They also have a characteristic fluorescence and visible absorption spectrum. Type II diamonds have no measurable nitrogen impurities. Type II diamonds absorb in a different region of the infrared, and transmit in the ultraviolet below 225 NMI. They also have differing fluorescence characteristics, but no discernible visible absorption spectrum. Type IIa diamond can be colored pink, red, or brown due to structural anomalies arising through plastic deformation during crystal growth—these diamonds are rare, but constitute a large percentage of Australian production. Type IIb diamonds, which account for 0.1% of gem diamonds, are usually light blue due to scattered boron within the crystal matrix; these diamonds are also semiconductors, unlike other diamond types. However, a blue-grey color may also occur in Type Ia diamonds and be unrelated to boron. Also not restricted to type are green diamonds, whose color is from exposure to varying quantities of radiation.

Celebrity

A celebrity is a widely-recognized or famous person who commands a high degree of public and media attention. The word stems from the Latin verb "celebrere" but they may not become a celebrity unless public and mass media interest is piqued. There are degrees of celebrity status which vary based on an individual's region or field of notoriety. While someone might be a celebrity to some people, to others they may be completely unknown. A global celebrity on the other hand is someone who is known by most people or is a mainstream celebrity. Such celebrities are also known as either a household name or superstar. For example, Virgin Director Richard Branson was famous as a CEO, but he did not become a global celebrity until he attempted to circumnavigate the globe in a hot air balloon and generate publicity for himself. Another high profile categorisation of celebrity status is the A-list, based on the marketability of celebrities. Generally speaking, a celebrity is someone who seeks media attention and most frequently have extroverted personalities. The desire to be famous is implied by some to be a part of western culture and more specifically the American Dream as a measure of success. Celebrities that shy away from the public eye or keep a very seperate private life are called a reluctant celebrity. A notable example is Kurt Cobain. On the oher end of the spectrum, those that seek out publicity for themselves are often called a media tart whereas those that use their private life as a vehicle for enhanced celebrity status, sometimes desperately, are referred to as a media whore. Examples of this are fake or planned relationships, reality television appearances, celebrity nudity and in extreme cases, scandal or celebrity sex tape. There are a wide range of ways people can become celebrities, from their profession, appearances in the mass media, beauty or even by complete accident or infamy. Instent celebrity is the term that is used when someone becomes a celebrity in very short period of time. In some places, someone that somehow achieves a small amount of transient fame through hype or mass media, is stereotyped as a B-grade celebrity. Often the stereotype extends to someone that falls short of mainstream or persistent fame but seeks to extend or exploit it.