Which of the following is true for diamond

Which one of the following is not true for diamond?

Which one of the following is not true for the form of carbon known as diamond?

which of the following is not true about structure of diamond and graphite?

Which of the following is responsible for glittering of a diamond ?

A ray incident at angle 30 degrees on the interface of diamond and vacuum from the diamond side then which of following is correct ( mu_diamond = 2.42 )

Which of the following types of forces bind together the carbon atoms in diamond ?