gold

all that glitters is not gold: seeglitter.

fool's gold: seefool.

go gold (of a recording) achieve sales meriting a gold disc.

heart of gold: seeheart.

pot (or crock) of gold a large but distant or illusory reward.

☞ This expression alludes to the traditional story that a pot of gold is to be found by anyone who succeeds in reaching the end of a rainbow.

worth your weight in gold: seeweight.