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Each of these ends in a kettle full of precious metal and the double variety is quite awesome.
Common Wrong Answers
“Pot of gold”
While a pot of gold is often associated with the end of a rainbow in folklore, it does not directly answer the riddle, which refers to 'each of these' implying a broader concept rather than a specific item.
“Treasure chest”
A treasure chest may contain precious metals, but it does not relate to the 'double variety' aspect of the riddle, which points towards a rainbow's multiple colors.
“Gold coins”
Gold coins are a form of precious metal but do not encompass the idea of 'each of these' or 'double variety' that relates to the colors of a rainbow.