In this problem you are only given enough information to find the
  values of rubies, saphires and diamonds relative to the price of
  a pearl.<br />
  <br />
  Try writing down what each jeweller has after he has made his
  gift. These four collections all have equal value. Use that to
  find other statements you can make about a number of one kind of
  gem matching for value a number of another kind of gem. <br />