Once the Average Girdle Diameter and the Depth are discovered it is possible estimate the weight of a Diamond just by applying a simple formula.
The formula is as follows;
Average Girdle Diameter x Average Girdle Diameter x Depth x 0.0061
So a Diamond with a Average Girdle Diameter of 6.5mm and Depth of 4mm will wight:
6.5 x 6.5 x 4 x 0.0061 = 1.03ct
It is important to know that the formula works only for Diamonds with good proportions, in some cases some modifications have to be made, so never rely only on the formula (non of the changes is extremely big, however if the estimated weight is 1.00ct it is possible that the Diamonds real wight is 0.94ct which have a lower per-carat price).
Showing posts with label Cut. Show all posts
Showing posts with label Cut. Show all posts
Sunday, January 23, 2011
Thursday, January 20, 2011
The Table
The Table has an extremely important role in the brightness and fire of a Diamond.
It is the biggest facet and largest visible part of the Diamond with an unaided eye, the table is essentially a door that lets light enter end exit the Diamond.
The Table size is generally expressed by its relation to the Diamonds diameter, some times it is expressed as "Table Size" and in most cases as "Table Percentage".
For example if the Diamond diameter is 100mm and the Table is 56mm, the "Table size" will be 56mm and the "Table Percentage" will be 56%, if the Diamond diameter is 8.05mm and the Table is 4.66mm, the Table size will be 4.66mm and the "Table Percentage" will be 57.88% [the equation is ("table size" x 100) divided by the Diamond diameter).
Most modern cut diamonds have a Table Percentage starting at 55% to 65%, Some old cuts have 45% or lower.
It is the biggest facet and largest visible part of the Diamond with an unaided eye, the table is essentially a door that lets light enter end exit the Diamond.
The Table size is generally expressed by its relation to the Diamonds diameter, some times it is expressed as "Table Size" and in most cases as "Table Percentage".
For example if the Diamond diameter is 100mm and the Table is 56mm, the "Table size" will be 56mm and the "Table Percentage" will be 56%, if the Diamond diameter is 8.05mm and the Table is 4.66mm, the Table size will be 4.66mm and the "Table Percentage" will be 57.88% [the equation is ("table size" x 100) divided by the Diamond diameter).
Most modern cut diamonds have a Table Percentage starting at 55% to 65%, Some old cuts have 45% or lower.
Tuesday, January 18, 2011
Total Depth Percentage
Once you know the Average Girdle Diameter and the Depth, the next step in order to get the Total Depth Percentage would be as follow:
Depth divided by the Average Girdle Diameter X 100 = Total Depth Percentage.
For Example:
Depth = 3.50
Average Girdle Diameter = 6.20
(3.50 / 6.20) X 100 = Total Depth Percentage.
(0.564) X 100 = Total Depth Percentage.
56.45% = Total Depth Percentage.
For Jewelry the ideal Total Depth Percentage is somewhere between 55% - 65%.
However when it comes to investment the ideal Total Depth Percentage would be 58% - 62%.
It is important to add the even if the Diamond is within the safe Total Depth Percentage there is no guarantee that its a excellent cut, there are many other factors involve, and it only takes one to jeopardize the investment.
Depth divided by the Average Girdle Diameter X 100 = Total Depth Percentage.
For Example:
Depth = 3.50
Average Girdle Diameter = 6.20
(3.50 / 6.20) X 100 = Total Depth Percentage.
(0.564) X 100 = Total Depth Percentage.
56.45% = Total Depth Percentage.
For Jewelry the ideal Total Depth Percentage is somewhere between 55% - 65%.
However when it comes to investment the ideal Total Depth Percentage would be 58% - 62%.
It is important to add the even if the Diamond is within the safe Total Depth Percentage there is no guarantee that its a excellent cut, there are many other factors involve, and it only takes one to jeopardize the investment.
Monday, January 17, 2011
Depth.
Depth is the second step needed to obtain the Total depth percentage, depth is the distance (in millimeters) from the top of the Diamond (the table) to the bottom (the culet).
Average Girdle Diameter.
Average girdle diameter is the first and most basic measurement taken, as you know every proportion of a Diamond is essential to its interaction with light, a shining Face-up look is extremely important in a Diamond.
The average girdle diameter is calculated by measuring the diameter of a round diamond from several locations in the girdle, adding the smallest and largest and dividing by 2. (all the measurements in a Diamond are expressed in millimeters)
For example:
after taking 4 measurements the biggest was 2.30mm and the smallest 2.22mm.
2.30mm + 2.22mm = 4.52mm
4.52mm / 2mm = 2.26mm
The Average girdle diameter is 2.26 mm.
Average girdle diameter is only one of two steps needed to get the Total depth percentage which is the most important factor in the Diamond cut.
The average girdle diameter is calculated by measuring the diameter of a round diamond from several locations in the girdle, adding the smallest and largest and dividing by 2. (all the measurements in a Diamond are expressed in millimeters)
For example:
after taking 4 measurements the biggest was 2.30mm and the smallest 2.22mm.
2.30mm + 2.22mm = 4.52mm
4.52mm / 2mm = 2.26mm
The Average girdle diameter is 2.26 mm.
Average girdle diameter is only one of two steps needed to get the Total depth percentage which is the most important factor in the Diamond cut.
Wednesday, January 12, 2011
Diamond Passport
This characteristics are the most basic for a proper Diamond evaluation, so we are going to take some time to explore each one and see what happens when they are not the way they should be.
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