Diamond

"Zis is nothing. At ze Palace of Beauxbatons, we 'ave ice sculptures all around ze dining chamber at Chreestmas. Zey do not melt, of course… zey are like 'uge statues of diamond, glittering around ze place."

- Fleur Delacour.

A diamond is a very valuable gemstone with remarkable physical characteristics: it has the highest hardness and thermal conductivity of any bulk material and a relatively high optical dispersion which results in its characteristic luster.

For Christmas, in 1996, Fred and George Weasley offered their mother a brand-new midnight blue witch's hat glittering with what looked like tiny starlike diamonds. Diamonds were among the gems set into Muriel's tiara, as well as moonstones.

Appearances

 * Harry Potter and the Prisoner of Azkaban
 * Harry Potter and the Goblet of Fire
 * Harry Potter and the Order of the Phoenix
 * Harry Potter and the Half-Blood Prince
 * Harry Potter and the Deathly Hallows