Midgaard's economy is based on GOLD and SILVER coinage (and the lowly copper,
which you as an adventurer are far too proud to carry). GOLD coins are worth
100 SILVER coins, but are also four times as heavy (25 to the pound, as
opposed to 100 to the pound for silver). Gems can be bought to alleviate weight problems
from the Midgaard jeweller, he charges a mere 10% more than they are worth.
10 gems weigh one pound, and they can be worth more than 100 GOLD pieces for
the highest quality stones.