Importance of 3EX NONE
High-quality diamonds must not only shine, but with three EX cuts and NONE, it can be more beautiful. Do you know how to choose?
Diamond cutting
A diamond must be cut nicely in order to show its beauty. If the cut is bad, the diamond lose its brightness and shine.
The identification of a diamond will detail the cutting ratios of the diamonds, such as depth, percentage of proportions, etc. If a diamond is in diameter, the current standard in the international market, diamond proportions account for 56% to 59%, the depth is about 60.5% to 63%. The girdle thickness should be thin to moderate, the point at the bottom cannot be seen with the naked eye, and within the appropriate medium, the girdle and symmetry should be good.
A well-cut diamond, when the light enters the diamond, it will shine back from the drill surface, but if a diamond is thinly cut or deeply cut, the light will slide away and the diamond will lose its brightness. A diamond with a nice proportion can properly position each facet and angle to reflect the maximum amount of light back into the crown of the diamond and directly into the observer's eye. This reflected light is known as a bright light or firelight. See figure below
The identification of a diamond will detail the cutting ratios of the diamonds, such as depth, percentage of proportions, etc. If a diamond is in diameter, the current standard in the international market, diamond proportions account for 56% to 59%, the depth is about 60.5% to 63%. The girdle thickness should be thin to moderate, the point at the bottom cannot be seen with the naked eye, and within the appropriate medium, the girdle and symmetry should be good.
A well-cut diamond, when the light enters the diamond, it will shine back from the drill surface, but if a diamond is thinly cut or deeply cut, the light will slide away and the diamond will lose its brightness. A diamond with a nice proportion can properly position each facet and angle to reflect the maximum amount of light back into the crown of the diamond and directly into the observer's eye. This reflected light is known as a bright light or firelight. See figure below
The length of the longest set of diagonals on a round diamond surface is divided by the average diameter. Fancy diamonds are divided by the width of the surface according to the proportion of the diamond.
The percentage obtained is the percentage of the surface. The surface percentage is calculated to an integer and the decimal point is rounded off. The most obvious influence on the size is the thickness of the crown. Additionally, the size of the surface is still affected by the thickness of the crown. If the crown maintains a certain thickness, the larger the angle, the larger the surface, and the smaller the it is, the smaller the surface. In modern diamond cutting theory, the most controversial is the size of the surface, so far there is no absolute standard. At the ideal angle of 34 1/2° for the crown, the most common tabletops are 56% to 59%, and the depth is about 60.5% to 63%. Over-the-top or oversized surfaces are not what most people prefer.
The percentage obtained is the percentage of the surface. The surface percentage is calculated to an integer and the decimal point is rounded off. The most obvious influence on the size is the thickness of the crown. Additionally, the size of the surface is still affected by the thickness of the crown. If the crown maintains a certain thickness, the larger the angle, the larger the surface, and the smaller the it is, the smaller the surface. In modern diamond cutting theory, the most controversial is the size of the surface, so far there is no absolute standard. At the ideal angle of 34 1/2° for the crown, the most common tabletops are 56% to 59%, and the depth is about 60.5% to 63%. Over-the-top or oversized surfaces are not what most people prefer.
Hearts and arrows
What is a Hearts & Arrows Cut
The picture below shows a perfect representation of the symmetrical eight hearts and eight arrows in a diamond. It is known as the most accurate and flawless cut in modern times.
The picture below shows a perfect representation of the symmetrical eight hearts and eight arrows in a diamond. It is known as the most accurate and flawless cut in modern times.
Fluorescence reaction
Fluorescence reaction has two main effects on diamonds:
1. Affecting the firelight - a stronger fluorescent light will make the diamond look more opaque
2. Color change - is the same color H of a diamond, the moderate fluorescent diamond will look whiter (GIA has documentary evidence)
On the diamond identification certificate, fluorescent reaction is test item 1, Medium fluorescent and above, the diamond price will have an effect. The fluorescent reaction is blue or yellow, which does not mean that the diamond itself is blue or yellow, the color of the diamond color is based on its own yellow shade as the criterion, rather than the Fluo color of the fluorescent response.
Diamonds with fluorescent reactions are not bad, they just have Medinim's moderately fluorescent diamonds, the price will be discounted. Many jewelry store owners do not want to spend time explaining to the guests, it is best to buy stones without fluorescent reaction because it is more convenient.
For example: there is a GIA certificate diamond, color is the whitest D colour, but if there is a Very Strong (intense fluorescent) reaction, there may be milky, foggy appearance.
But there is another GIA certificate diamond, color is H-color, there is a medium (moderate) fluorescence reaction, but it may look like F color, that is, a whiter phenomenon happening.
In the certificate (diamond quality analysis report), there is a line that notes whether there is a fluorescent reaction. Its effect on diamonds is as follows:
Colorless diamond (color DH), but with Faint's micro-fluorescence reaction, it will look more blue in daylight than NONE (no fluorescent) diamonds, because sunlight has a lot of ultraviolet light, so it will look whiter and slightly yellow if the diamond (below I) emits blue fluorescence which will look better under daylight, better results.
Faint (weak)
fluorescence has little effect on the price of colorless diamonds. On the contrary, some Medium will increase the diamond color to one or two levels, which is the original GIA's H color. It will be judged as F or G color by FAINT fluorescence.
Medium fluorescent
If the price seems foggy, the price will definitely be discounted.
Strong or Very Strong fluorescent
light will make the diamond look milky or oily, the price will naturally be reduced greatly. Fluorescent reaction Very Strong (very strong) diamond,
Transparency will also be affected, so it is better to choose a transparent texture for the fluorescent reaction of Very Strong diamonds.
Older generations buy diamonds and want to buy the so-called "oilie diamond "
where a beam of blue light can be seen under the sun, and even a chrysanthemum phenomenon may appear, which is a Very Strong (fluorescence reaction), is very strong fluorescent reaction of the diamonds. Before, many believed "blue light" diamond, diamonds with beams of blue light are the real diamonds, but now, diamonds with Medium (moderate) or above fluorescent diamonds, unless the discount is great, try not to consider it.