Jewellery or jewelry (American and British English spelling differences) signifies items of personal adornment, such as necklaces, rings, brooches, earrings and bracelets. Jewellery may be made from any material, such as gemstones, precious metals or shells, besides other materials, depending on cultural differences and availability of materials. Jewellery may be appreciated because of geometric or other patterns, or meaningful symbols. Items such as belts and handbags etc. are considered to be accessories rather than jewellery. The word jewellery is derived from the word jewel, which was Anglicised from the Old French "jouel" circa the 13th century. Further tracing leads back to the Latin word "jocale", meaning plaything. Jewellery is one of the oldest forms of body adornment; recently found 100,000 year-old beads made from Nassarius shells, are thought to be the oldest known jewellery. Jewellery is sometimes seen as wealth storage or functionally. Jewellers - Artisan jewelry dates back as far as 7000 BC, when gold and copper began to be sculpted to adorn the human form, and the practice continues today. Although rarely price-competitive with machine-made items, artisan handmade jewelry is prized for its uniqueness, variety, and beauty. Reflecting the talents of the artisan onto the wearer, the broad spectrum of artisan jewelry is available to provide satisfaction to royalty, rock stars, and "everyday folk." Thousands of jewelry artisans exist around the globe. Some fine examples of artisan jewelry can be seen at museums. A goldsmith is a metalworker who specializes in working with gold and other precious metals. Since ancient times the techniques of a Goldsmith have evolved very little in order to produce items of jewelry of quality standards. In modern times actual Goldsmiths are rare. Historically goldsmiths have also made flatware, platters, goblets, decorative and serviceable utensils, and jewelry. Diamonds - is one of the best-known and most sought-after gemstones. Diamonds have been known to humankind and used as decorative items since ancient times; some of the earliest references can be traced to India. Diamond's hardness and high dispersion of light – giving the diamond its characteristic "fire" – make it useful for industrial applications and desirable as jewelry. Diamonds are such a highly traded commodity that multiple organizations have been created for grading and certifying them based on the four Cs, which are carat, cut, color, and clarity. Other characteristics, such as shape and presence or lack of fluorescence, also affect the desirability and thus the value of a diamond used for jewelry. Perhaps the most famous use of the diamond in jewelry is in engagement rings, which became popular in the early to mid 1900s due to an advertising campaign by the De Beers company, though diamond rings have been used to symbolize engagements since at least the 15th century.