What is carat in Diamonds?

What is carat in diamonds & what does ‘carat’ mean?
To put it simply, diamond carat weight measures how much a diamond weighs.
A metric “carat” is defined as 200 milligrams or 0.2gm. Each carat is subdivided into 100 ‘points.’ This allows
very precise measurements to the hundredth decimal place.
Where did the term ‘carat’ come from?
The word ‘carat’ originates from Ceratonia siliqua, commonly known as the Carob tree. In ancient
times, before scales and units of mass were invented, diamond traders compared the weight of a
diamond to the seeds of the Carob tree because each seed weighed the exact same amount as the
next.
How big is each carat of diamond?
Assuming that a diamond is cut to ideal proportions, the list below shows a carat to millimetre size conversion:

0.10ct – 3.0m,

0.25ct – 4.0mm

0.33ct – 4.4mm

0.50ct – 5.0mm

0.75ct – 5.75mm

1.00ct – 6.5mm

1.25ct – 6.8mm

1.50ct – 7.3mm

2.00ct – 8.0mm

Are diamonds with a high carat weight more expensive?
All else being equal, diamond price increases with diamond carat weight because larger diamonds
are rarer and more desirable. However, two diamonds of equal carat weight can have very different
values (and prices) depending on three other factors of the diamond 4c’s; colour, clarity, and cut.
While now you know what carat means, it’s also important to remember that a diamond’s value is
determined using all of the 4Cs, and not just carat weight.