....However the question remains why it is in the form of 100 grams ingots which are commonly used by individuals but not companies. The latter prefer 1 kg bars.
It doesn't really matter gold bullion bars stored at bullionstar vault weigh 100 gram or 1 kg. .
Nope, it really matters because the whole value of the gold they are possesing depends on the weight of the separate ingot due to the difference in margin. But probably they have their own reasons to do just that.