Diamond carat weight is a measurement of how much a diamond weighs.

200 milligrammes equals one metric “carat.” 100 ‘points’ are distributed into each carat. This enables measurements to be made to the hundredth decimal place. A jeweller can use the ‘points’ alone to convey the weight of a diamond under one carat. A 0.25 carat diamond, for example, would be referred to as a ‘twenty-five pointer’ by the jeweller. Carats and decimals are used to express diamond weights larger than one carat. ‘One point oh eight carats’ is how a 1.08 carat stone is characterised.