SRD said:Glamer: A glamer spell changes a subject’s sensory qualities, making it look, feel, taste, smell, or sound like something else, or even seem to disappear.
yennico said:I want to look normal stones or copper coins like gold nuggets or coins made out of gold.
Can I use the Prestidigitation spell to duplicate the effects of the Ad&d spell "fools gold" ?
KaeYoss said:But there is another, more important question. "Are gold coins exactly the same shape as silver coins, just made of gold instead of silver" Ultimately, this is up to your DM, but I think that gold, silver and copper pieces look different, and not just due to coloration.
kigmatzomat said:I second this. IMC the coppers have a shiled motif and hole in them so they can be kept tied to a string. Silvers are octagonal and bear the crest of the king's clan, gold coins are round with the symbol of the crown, and platinum are hexagonal with an engraving of the royal castle. A set of scales with cut-outs to make sure the coins are the right size is all most merchants need.
Counterfeiting the currency isn't impossible but it generally isn't worth it. Matching the density, pattern, and design becomes work. The profit is so low as to be generally not worth the time. Which is the main goal of anti-counterfeiting measures. You can't stop it but you can make it sufficiently expensive as to be counterproductive.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.