The term ‘carat’ refers to the weight of the diamond. More than a hundred years ago, the diamond industry measured weights using carob seeds, as they were small, similar-sized, and acted as a counter weight to the diamond. Thus, the carat weight in diamonds in use today has its origins from the word ‘carob’.
Diamond Size and Carat Weight
Diamond size is proportional to carat weight. As rough diamonds are cut and polished into finished ones, it is not uncommon that close to 2/3 of the carat weight could be lost.As it is the case that larger rough gems of high quality, when mined, are found far less than small rough gems of high quality, it is clear that a two carat diamond will be far more expensive than two one carat diamonds of equal quality.
In North America, the majority of loose diamonds used and sold in jewelry are one carat or less. In fact, the average diamond engagement ring sold is less than a 1/2 carat in weight.
The weight of a diamond will proportionally increase much greater than its ‘face up’ diameter, i.e. an ideal cut one-carat diamond measures around 5.5mm in its depth, while a two carat diamond, twice the weight,, measures only 8.2mm wide, an increase of less than 30%.
Which Carat weight Should You Choose
As you can imagine, there is no perfect answer. Your choice certainly depends on your preferences, tastes and budget.
Most importantly, the most visible part of a diamond engagement ring is its surface area looking at it from the top.
You will not see or gauge the weight of your ring merely by looking at it.
While carat weight is a great determinant in the overall cost of a ring, we advise particular attention be paid to the diamond cut and its diameter.