Question

real diamond cant show up in x-ray ?

Answer 1

Answer:

It is sometimes said that diamonds don't show up on X-ray images. That's not true, as diamond smugglers can be caught in X-ray checks. However, it is true that, in the early days of X-rays, diamond rings could be distinguished from synthetic or 'paste' stones used in costume jewellery using X-rays.

Answer 2

Diamonds appear radiolucent because they are usually small and are composed of carbon. Carbon has a low atomic number of 6 and attenuates x-rays to a much lesser degree than high atomic number elements such as lead which has an atomic number of 82.