Diamond Carat

Diamond carat/karat:

Carat is probably the most talked about aspect of a diamond. It refers to its weight and its overall size. Usually, the bigger the diamond, the higher the carat number. However, when comparing two diamonds, a smaller diamond may be more valuable than a larger diamond if it possesses a far superior cut, whiter colour and higher clarity grade.

Remember, the cut of a diamond is above all the most important, so bear that in mind when shopping for the perfect diamond. You want the cut to be absolutely perfect or the carat becomes just another number.

Measurement of a Diamond

Like many other gemstones, diamonds are also weighed in metric carats where 1 carat = 0.2 grams. Fraction of a carat can make a huge value difference, even in the case of smaller diamonds. That is why diamonds are weighed in a thousandth of a carat and rounded to the nearest hundredth point. Diamond range starts from a small point to more than 100 carat, but in regular diamond market people shop for diamonds ranging from 5 points to 3 carat.

While purchasing diamonds, people generally consider the total carat weight of all diamonds present in a jewellery piece and do not talk about the individual weight of each diamond. E.g. if a ring carries fifty 1 point diamonds or two quarter carat diamonds or a single half carat diamond, the total diamond weight is observed as half carat in all cases, however the prices may vary considerably, being the highest for a single half carat diamond.

Cullinan is the largest rough gem diamond ever discovered and it weighs around 3,106.75 carats, while Golden Jubilee Diamond weighing 545.67 carats is the largest polished diamond.

Diamond Relative Carat / Size Comparison

Carat is a measurement of weight, not size and so the overall diameter (mm) could differ slightly even though the carat weight is correct. Image is not to scale. Diamond pictures are shown for comparison purpose only. Actual size 

can vary depending on your screen resolution, monitor size, etc.

Loose diamonds can be weighed on a jeweller’s balance. However, if the diamond is mounted, the weight is estimated using the weight-estimation formula. Estimating weight in this fashion is less precise but enough to let appraisers make reasonable evaluations without demounting the diamonds.