http://advices-and-information-engineering.blogspot.com/ information about Gems and Jewellery information about Gems and Jewellery :- as we have senn jewellery has been in use since the stone age . reasons for the popularity of jewellery included the love of beautifu things. the desire for personal adorment and the wish to show to others the wearer s wealth or power. jewellery was also associated with super-stitions and magic . all these factors apply in one awy or another today . Famous Gemstones ;- many gemstones have become famous in ther own right . for example :- the largest diamond ever found was the Cullinan , which was named after Sir Thomas Cullinan ,chairman of the permier mining company in South Afrrica . this diamond measuring about 12.5 centimetres about (5 inches) across was found at permier mining in 1905 . it weighed ( 3.106 metric carats ) Carats are the units used for weighing gemstons . 5 carats =1 ...