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A carat is a unit of measurement used to specify the weight a diamond. Carat is just a diamond industry special word for weight of a diamond stone. One carat is equal to 200 milligrams, i.e., a 5-carat stone will weigh 1 gram.
People often mistakenly assume that a diamond's size is synonymous with its carat weight, though that's not necessarily true. Like a human body the more the weight the more likely the size is bigger, but other factors also affect the size. The way in which the diamond is cut will greatly affect the diameter and brilliance of the diamond. Diamonds with a poorer cut, for example a change of depth or a thick girdle, will maintain their heavy weight but 'hidden' in the base of the diamond with less surface on top so they look smaller.
Given below is an approximate chart of diamond carat weight and round diamond diameter size
How did the modern Diamond Carat System Start?
The modern carat system started with the carob seed - a seed from a tree that grows in the Mediterranean and has fruit pods that contain multiple seeds. Those very early gem traders used small uniform seeds as counterweights to balance their scales. The modern diamond carat system was adopted by the United States in 1913 and other countries soon followed later. Today, a diamond carat weighs exactly the same in every corner of the world.
What are “magic sizes”?
Some weights are known as “magic sizes” - half carat, three-quarter carat and carat. There is little difference visually between a 0.99 carat diamond and one that weighs a full carat. However, the price difference between the two can be quite significant.
Diamond Carat Buying Tips
When buying a diamond ring you should choose a diamond carat weight that suits the wearer's fingers. Selecting a smaller carat weight for thicker fingers will not suit the fingers. Selecting a higher carat weight for thinner fingers will make the ring look very prominent. Most would like that but some may not want that.
Do not simply go for higher diamond carat weight to obtain a larger size. Distribute your budget against diamond carat weight as well as other characteristics. A large diamond with poor clarity and colour may not always look great.
At Shining Diamonds we give customers the flexibility to select from a range of different diamond carat weights ranging from 0.25ct to 1.00ct. This range of diamond carat weight is most popular, however if required we can do carat weight even higher than 1.00ct.