Tips to maintain your Jewellery
Cut refers to the finish and proportions, and how these factors influence the overall appearances of a diamond.
White and contrasted light called "brilliance" the colour flashes called "fire" and "scintillation" or flashes of light that occur when the stones moves, the ratio of weight vs. size, the smoothness and the symmetry of polished faces: all these determine how light enters the stones, in what it returns to the eye, and how the stone performs in terms sparkles. The cut grade is expressed on a scale from Excellent to Poor.
Also called H&A, these are mostly round diamonds with a superior cutting quality. They display a visual pattern of 8 hearts when looking at the same pavilion, and 8 arrows when viewing the stone in the face-up position, while using a Hearts and Arrows loupe.
Most gem quality used in jewellery are colourless and nearly colourless, sometimes with tints of yellow and brown. Among the rarest are the colours D, E and F on a scale that goes to Z.
Colour grades are established by comparing each diamond to a set of each master comparison diamonds. Each grade represents a range of colour. Grading colour is done in a specific and controlled lighting environment and according to strict colour grading procedures.
More colour intensity than Z is called "fancy" colour. Diamonds of colours can be found in nature; over 300 colours have so far been identified, however these came in an infinite numbers of shades and hues.
Since diamonds form under tremendous heat and pressure, internal and external characteristics are common.
These characteristics help gemologists separate natural diamonds from synthetics and simulants, and identify individual stones.
The difference is based on their location: inclusions are inside the diamond while blemishes are only on its surface.
Carat is the standard unit of weight for diamonds and other gemstone.
One carat equals one fifth of gram. When weighing less than one carat, the diamond weight is expressed in "points" : each carat is divided into 100 points, for examples
0.75ct. = 75 points
½ ct. = 0.50ct. or 50 points
¼ ct. = 0.25ct. or 25 points
When diamonds are mined, large gems are discovered much less frequently than smaller ones. Diamonds prices increase exponentially with carat weight. So, a 2-carat diamond of a given quality is always worth more than two 1- carat diamonds of same quality.
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