Can You Solve this Ice Diamond Riddle? ft. Vsauce’s Michael Stevens

The water lvel goes down and we can prove this using numbers.
Let the mass of diamond be 3.5g and volume be 1cm3.
Then initially before the ice melts the diamond will displace water equal to its weight and that is 3.5g of water will be displaced.
Once the ice has melted the diamond will displace water equal to its volemu and that is 1cm3 of water and 1 cm3 of water is equal to 1g of water hence the WATER LEVEL DROPS as more water is initially getting displaced than later and this is due to the more density of diamond as compared to that of water.