How To Measure a Diamond’s Size

Even when men claim to love you for time eternal, it is their diamonds that outlive their passions. That is why diamonds are a girl’s best friend, or so they say. Diamonds are the ones that truly live up to their promise of forever. (Fun fact: The largest diamond ever discovered is the Golden Jubilee Diamond that weighs 545.67 carats or 109.13 grams in 1985. The diamond was given to the King of Thailand, King Bhumibol Adulyadei, on his 50th coronation anniversary.

An important lesson every girl must learn is how to determine the value of a twinkling diamond. This will come in handy when choosing the perfect stone for you engagement or wedding ring. There are 4Cs to remember when evaluating a diamond- clarity, carat, cut and color. The most important of the 4Cs is the carat or size of the diamond. (One carat is equivalent to 200 milligrams.)

Though carats are used to measure size, one must not get confused because two gems may be of the same size but not of the same weight or carat. Some stones are denser than others.

Aside from carats, another means, which jewelers use to refer to diamond size is through a point system. One hundredth of a carat is equal to one point. Here’s how to measure a diamond’s size. You can do it two ways.

Measuring a diamond’s size using a weighing scale.

You will need a highly sensitive weighing scale that can distinguish in millimeters, any dark colored cloth and tweezers.

Remove the diamond stone from its setting: ring, necklace or earring. Place it on a dark colored cloth. Diamonds are hard to see on light colored cloth, so it’ll be easier and safer to place it on a navy or black sheet of cloth.

Carefully pick up the diamond with your tweezers and set it on the weighing scale. Take note of the registered weight in millimeters.

Compute for the carat weight by dividing the number by 200 milligrams to get its carat weight. (Note: one carat is equal to 200 milligrams.)

Measuring a diamond’s size using a caliper tool.

You will need a caliper, any dark colored cloth and tweezers.

Though you can measure the stone this way even if it’s set, it is still best to remove the diamond from its setting to get a more accurate measurement. Place the diamond on a dark colored cloth.

With a caliper, measure the length and width of your stone. Typically, 6.5 millimeters is equivalent to a one-carat stone.

As you will soon find out, no two stones are alike even when stones look the similar at first glance. Determining their differences and understanding the structure of diamonds will help you understand why they are priced differently. For a more accurate and more thorough valuation of your diamond, it is best that you consult with a professional jeweler. He will not only give you the dimensions of your stone, but he can also discuss the cut, carat, clarity, weight and color.


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