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I came across this video which shows how a crystal chandelier is made. I recommend that anyone reading this post should watch it; it is quite fascinating.

Anyway, at about the 2:15 mark, the video talks about how ruby red crystal is produced by adding 24-karat gold powder to the glass. However, they say the colour emerges after reheating in an oven at $1000\ ^\circ C$.

My question is, why is the reheating step necessary ?

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    $\begingroup$ To nucleate and grow the appropriate sized gold nanoparticles. Both gold and silver were used in medieval cathedral stained glass windows. $\endgroup$ – Jon Custer Nov 1 '16 at 13:32

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