If you want something you can actually find in stock at a major dealer like APMEX or JM Bullion, you should look for .
: Officially the world's smallest gold coin, it weighs just 0.05 grams and measures 1.99 mm across (about twice the diameter of a sewing needle tip). Only 199 were minted, and they originally only came as part of a set with a 1 oz coin. smallest gold coin you can buy
: Even smaller than the 1/10 oz, these are offered by some mints and are often the smallest available "traditionally" shaped bullion coin. If you want something you can actually find