The value of jewellery depends on the quality of the materials used to make it, its design, maker and condition, and the prevailing fashion and taste.
Rare gems of the highest quality are usually a good investment because the political and physical problems involved in mining them and the scarcity of fine stones means that supply is unlikely to exceed demand. Diamonds are the exception as their supply is controlled by an international cartel to maintain prices, but demand can always be fulfilled so no dramatic rise in pieces is likely.
All that glitters is not gold, or so the saying goes, but what is the true colour of gold? Most of us believe we know the colour of gold, but do we really know the colour of gold? Even the type of polish used to polish gold can slightly change the colour, so what is the colour of gold. White gold, yellow gold, rose gold pink gold, green gold and even black gold are available, so what is the true colour of gold?