琛 is not common in everyday text, but it is a classical character meaning 'precious treasure/gem'. It has the
王 radical (which on the left = jade
玉) on the left and a phonetic on the right — all
王-radical characters tend to denote jade or gems (
珠,
璃,
瑶…).
许琛 as a name suggests something like 'Xu the treasured one'.
