Question 919236
If the bracelet were {{{100}}}% gold, it would weigh 

{{{Weight = Volume * (grams/cc)}}}

Using the info given in the problem, the volume is {{{15cc}}} and gold weighs {{{19.3(g/cc)}}

Thus {{{Weight = 15 * 19.3 = 289.5}}} for a pure gold bracelet. 

This one weighs only {{{238}}}. So it is 'less than {{{18k}}} gold' and the bracelet is {{{not}}} really 18-Karat Gold