Edwardian 18ct Gold Ruby & Diamond Cluster Stick Pin

A smart 18ct75% pure gold (or 750 parts pure gold and 250 parts other metals) gold and square cut rubyOne of the most valuable gemstones on earth. From the corundum family, the red variety being ruby and the blue, sapphire. With the exception of the diamond, corundum is the hardest of the gemstones on the Mohs scale scoring a 9. and rose diamondA precious, lustrous gemstone made of highly compressed carbon. Diamonds are one of the hardest materials known to mankind. Colours of diamonds range from colourless, yellow, orange and brown to almost black. Natural coloured (or ‘fancy’) diamonds can be extremely rare. The cut, colour, clarity and carat weight of a diamond are the criteria jewellers use… stickpin that was made circa 1900-1910.