The origins of the customary units of measurement in South Asia are varied. As in Europe, there were various local systems of everyday measurements of length, mass and dry volume (the latter being a de facto measure of mass for many staple grains), while gold, pearls and gemstones were weighed on a different, slightly more standardized scale. Several of the more important units were cognate with units of measurement in the Arabian Peninsula to the West or in China to the East, to facilitate trade.