The DIAMOND planet
One of the most expensive element in this world are diamonds. these shining pieces looking like glass and are outrageously expensive and strong. they cost about $60,000 per gram.

these are nearly indestructible and rare. what would u think if i say that there is a complete planet made of diamonds.
the name of this diamond planet is 55 Cancri E and was found in 2004 by astronomers and they claim that atleast one-third of the planets mass is pure diamond.
this planet is worth 384 quadrillion times the earth's GDP. the planet is twice the diameter of earth and its mass is 8 times the mass of earth.