It looks like undefined yellowish metal alloy with some patina & iridescent. Gold’s quality is that there’s minimal decay and mainly no patina/oxidation, no iridescence… So you mixed it with what??? All gold consumer products are alloys. Are yours fake (quasi/similar) or physically based (correct)?
There are great resources for gold (property tables of gold alloys in consumer production, scientific IOR values for different gold alloys, free materials for render engines (lux, yafaray, indigo, thea, vray, cycles…), tutorials on how to make’em…), and you go make some shiny quasi gold material to sell on market?!?
Also I prefer Swapping: http://www.blendswap.com/blends/view/38983 (gold)
Is my critique & observation worth 10$ or more? Wanna help you make ‘correct’ products. So do you refund if customer is not satisfied?