To convert carats to grammes divide by 5. I've generated some hopefully helpful examples randomly below, as with most random sentences please excuse the repetitive and occasionally comic outcomes.

How many grammes of diamonds are there in 0.2 carats? Just divide by 5 to get the answer of 0.04 grammes.

You've got 2.3 carats of emeralds but someone only wants to buy that in units of grammes, to change the units divide by 5. Now you have 0.46 grammes.

To convert 4.8 carats into grammes divide by 5 giving 0.96 grammes.

You have 3.6 carats of platinum but you need to know how many grammes that is. To get the answer divide by 5 which gives you 0.72 grammes.