In recent years, several important diamonds recovered from Letšeng have been sold to London luxury jeweler Laurence Graff.While the Premier (now Cullinan) mine in South Africa is usually cited as the traditional source for very rare large diamonds, in recent years the Letšeng-la-Terae mine in Lesotho has become the major producer of such stones (figure 1).Background We think of a battery today as a source of portable power, but it is no exaggeration to say that the battery is one of the most important inventions in the history of mankind.

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Although its total output is relatively small—about 100,000 carats yearly, compared to two million or more carats from most major diamond mines—the average value of its production in 2014 was just above US$2,500 per carat (Gem Diamonds Ltd., 2014, 2015a).

This is by far the world’s highest per-carat value, more than 21 times higher than the $116 average for diamonds mined worldwide, according to Kimberley Process data.

They did not have the benefit of cheap, off the shelf, mass produced batteries. Bronze is a relatively hard alloy of copper and tin, better suited for the purpose than the much softer copper enabling improved durability of the weapons and the ability to hold a cutting edge.

For many years the telegraph, and later the telephone, industries were the only consumers of batteries in modest volumes and it wasn't until the twentieth century that new applications created the demand that made the battery a commodity item. The use of bronze for tools and weapons gradually spread to the rest of the World until it was eventually superceded by the much harder iron.

Da ciò deriva che tutte le azioni che in un normale libro cartaceo sono immediate e scontate, come ad esempio lo scorrere le pagine o l'inserimento di un segnalibro, possono essere emulate dal software del dispositivo di lettura.

Il libro elettronico, nell'imitare quello cartaceo, approfitta ovviamente dei vantaggi offerti dalla sua natura digitale, che risiedono principalmente nelle possibilità di essere un ipertesto e inglobare elementi multimediali, e nella possibilità di utilizzare dizionari o vocabolari contestuali.

Si tratta comunque di attività slegate dalla piattaforma di vendita, ossia il sito vero e proprio in cui l'ebook viene acquistato.

Malgrado un qualunque computer sia potenzialmente in grado di permettere la lettura di un ebook, si dovrebbe parlare di e Book reading device solo riferendosi a quei dispositivi dotati di caratteristiche tali da poter essere usati in maniera analoga a quella di un libro cartaceo.

Photo by Robert Weldon/GIA; courtesy of Gem Diamonds Ltd.