Commonly encountered in daily life is the avoirdupois ounce, an Imperial weight in countries still using British weights and measures or United States customary units. One troy ounce is equivalent to 31.1034768 grams. Gold is measured in troy ounces, often simply referred to as ounce when the reference to gold is evident. A hologram security feature known as a Kinegram can also inserted into packaging, bars that contain these are called Kinebars.Ĭredit Suisse Gold Bar Serial Number Video In most refineries serial numbers are only reserved for large bars (over 250g) with smaller ones having no serial number at all due to their small value.Ĭompared with cast bars which are often handled directly, minted bars are generally sealed in protective packaging to prevent tampering and keep it from becoming damaged.

To prevent bars from being counterfeited or stolen manufacturers have developed ways to verify genuine bars with the most common way being to brand bars with registered serial numbers or providing a certificate of authenticity. These are identified by having a smooth and even surfaces.

Minted bars are made from gold blanks that have been cut to a required dimension from a flat piece of gold. Cast bars are also cheaper compared those that are minted because they are quicker to produce and require less handling. This process often leads to malformed bars with uneven surfaces which although imperfect makes each bar unique and easier to identify. Cast bars are created in a similar method to that of ingots whereby molten gold is poured into an a bar shaped mold and left to solidify. Based upon how they are manufactured gold bars are categorised as having been cast or minted with both differing in their appearance and price.

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