The theory is that diamond jewellery first commenced to appear about 5000 in the past. Before that, there might have been several loose diamonds which had been discovered, but it was only about 5000 years back that they were forged into diamond jewellery.
Previously, diamonds tended to experience a role in religious ceremonies. A lot of the diamond jewellery from that point was the biggest market of various rituals and ceremonies, and it was only later who's began to be taken for pure adornment.
At some time, mankind discovered how hard diamonds actually were - this also is when rather than just being used included in diamond jewellery, diamonds actually did start to be used to shape and engrave other metals that were a part of jewellery too!
Through the years, little has changed in terms of diamond jewellery is concerned. Today, it's still as valuable mainly because it was 1000's of years ago.
Something that has changed will be the techniques and operations that are utilized to create diamond jewellery. With advanced machinery and a greater capability to manipulate metals and cut the stones themselves, the jewellery found today is a bit more intricate in many cases.
Through the centuries, colorless diamonds are already considered more 'valuable' than other diamonds. Their sheer brilliance is without a doubt one of the reason behind that, yet it's also the fact that diamond jewellery made out of colorless diamonds is thought to be more 'pure'.
Many beliefs surround diamonds to this very day. Not only is it an important stone inside Western tradition of marriage, however it is also thought to be lucky, along with a symbol of fortune and prosperity.
Also the aesthetic price of diamonds never have diminished in the past.
In older times, diamond jewellery (or at least the diamonds themselves) came predominantly from India. Now that most of those mines are dry though, diamonds generally hail from Russia, Africa, and several parts of Australia.
Today's system of evaluating the 'worth' of the diamond is founded on various factors including its 'cut', 'carats', 'clarity' and 'color'. Naturally the most expensive diamond jewellery are usually those that have essentially the most carats (i.e. the extra weight and size the stone itself).
All said and done, diamond jewellery is a huge part of human civilization for millennia - and seems set to remain down that road for the foreseeable future. Certainly, not one other stone has captured people's hearts and minds up to diamond jewellery has.