Materials we use at ORRO
Au is the chemical symbol for gold and derives from the element's Latin name Aurum. Pure gold known as 24 carat has the alphanumeric designation Au1000 and is a rich yellow colour.
Gold becomes harder and the colour alters when alloys with other metals are created. The alloy known as 18 carat has the designation Au750 (this means that by weight 750 parts per 1000 are pure gold the remaining 250 parts consist of other metals) and is most frequently seen in a pale yellow hue.
Most 'white gold' sold on the high-street is rhodium plated to make it appear like platinum. This plating wears off over time and needs re-plated regularly. We recommend the use of a different alloy which contains the precious metal palladium, a close relative of platinum. This material is slightly greyer than platinum but doesn't require plating. Sometimes referred to as 'grey gold', it is slightly more expensive than the cheaper plated alloys, but over the years the saving on the cost of plating more than makes up for this.
Gold is also available in other colours such as red, reddish, sand grey, green and pale green.