What is the difference between carat weight and size of a gemstone?
The parameters of a gemstone are influenced by its size and carat weight. These are two characteristics that reflect its different properties. Therefore, it is necessary to dwell on each of them in more detail.
A carat is simply a unit of mass for a stone. One carat (1 kt) is equal to 200 milligrams or 0.2 grams.
Determining the value of a stone using carats is a common method that influences the price. The more carats, and, accordingly, the mass, the higher the price will be for a gem. The size is measured by the external parameters of the stone: its height, width and other characteristics.
Among the additional characteristics, one can single out the determination of the size of the top (platform) and key proportions that determine the quality of the cut. The size of the top plays a big role as it is the most visible part of the stone. It is the top that catches the eye when viewed. At the same time, the depth does not matter as much. this part of the stone will be hidden behind the rim. Cut ratios are also important because they affect the brilliance of a stone, its ability to reflect and refract light.
What is the difference between carat weight and size?
Carats – determine the mass and weight of the precious, and the dimensions – determine its parameters and characteristics. Consequently, two stones with the same carats may have different sizes and proportions. And at the same time, stones of the same size and diameter may have different carats.
What does the size of the stone indicate?
While the carat is a value that is not influenced by the external factor and the quality of stone processing, the size is determined by the cut. Some cutting methods do not require depth, while for others, on the contrary, the depth of the stone is important. For example, for emerald cuts, the design does not imply depth of facets, while for round cuts or princess cuts, depth is of great importance.
How is the size of the stone determined?
One stone may have a greater width, while another has a height. Oddly enough, the depth of the stone affects the visual sense of size. If the depth is large, then the stone in the jewellery will appear smaller than a similar stone with a shallower depth, with the same carat and cut characteristics.
How does the size of a stone affect its weight?
By changing the size of certain parts of a diamond, a jeweler can influence its weight. For example, if you take two round diamonds with the same diameter, but one of them is deeper and with a thick belt, then this stone will be heavier. A deeper stone will be more expensive because it weighs more, although it will appear to be the same size as a shallower stone.
How are round stones measured?
The most important dimensions of a round gemstone are the diameter of its girdle and platform, the height of its crown and pavilion, and the overall depth of the stone. One of the best ways to take these measurements is with a micrometer or leveridge (a tool that jewelers often use to measure gemstones).
Measurement of the belt diameter. If you look at the stone from above, its diameter is a straight line that can be drawn through the center, connecting two points located opposite each other on the diamond’s belt. If you don’t know what a belt is, this is simply the widest part of the diamond (or, its outer edge).
Measurement of the diameter of the site. The platform of the stone is a flat face at its top, and its diameter will be less than that of the belt. The pad diameter is determined by the length of an imaginary straight line that passes through the center of the face and connects two points on the sides of the pad.
Measuring overall depth. The total depth of a round stone is the vertical distance between its uppermost facet (platform) and the pointed lower part of the stone (which can be faceted, in which case the facet will be called “culet”).
Measuring the height of the crown. The height of the crown of a grave stone is part of its total depth. This is the vertical distance between the main face (land) and the chord. The crown is actually the top of the stone above the belt.
Measuring the depth of the pavilion. The depth of the pavilion is also part of the overall depth of the stone. It is determined by the vertical distance from the chord to the lower end. The pavilion is a part of the stone below the belt.