Diamonds are judged by many factors, and their ratios play a significant role in determining their appearance and brilliance. The “diamond ratio” usually refers to the proportions and dimensions affecting a diamond’s look. This is particularly important for fancy-shaped diamonds like ovals, marquises, and pears. This article will cover how a diamond ratio calculator works, its purpose, functionality, and some important formulas.
Introduction to the Calculator
A diamond ratio calculator helps you assess the key dimensions and proportions of a diamond. By inputting certain measurements, the calculator can provide valuable insights into the diamond’s shape, brilliance, and overall appeal.
Purpose and Functionality
The main purpose of a diamond ratio calculator is to:
- Evaluate the Shape: Determine the length-to-width ratio for fancy-shaped diamonds.
- Assess Brilliance: Calculate the table and depth percentages to understand how light interacts with the diamond.
These calculations help in deciding the quality and value of a diamond.
Important Ratios in Diamond Grading
1. Length to Width Ratio
This ratio is crucial for fancy-shaped diamonds. It is calculated by dividing the length of the diamond by its width.
Formula:
Length to Width Ratio=LengthWidth\text{Length to Width Ratio} = \frac{\text{Length}}{\text{Width}}Length to Width Ratio=WidthLength
2. Table Percentage
The table percentage is the ratio of the width of the diamond’s top facet (table) to the overall width of the diamond.
Formula:
Table Percentage=(Table WidthTotal Width)×100\text{Table Percentage} = \left( \frac{\text{Table Width}}{\text{Total Width}} \right) \times 100Table Percentage=(Total WidthTable Width)×100
3. Depth Percentage
The depth percentage measures the height of the diamond from the culet (bottom point) to the table (top facet) as a percentage of the overall width.
Formula:
Depth Percentage=(DepthWidth)×100\text{Depth Percentage} = \left( \frac{\text{Depth}}{\text{Width}} \right) \times 100Depth Percentage=(WidthDepth)×100
Implementation for a Diamond Ratio Calculator
To use a diamond ratio calculator, you need to input the following:
- Length
- Width
- Table Width (optional)
- Depth (optional)
Sample Inputs and Calculations
Let’s take an example to see how these calculations are performed.
- Length: 5 mm
- Width: 3 mm
- Table Width: 2 mm
- Depth: 2.5 mm
Calculated Values:
- Length to Width Ratio:
Length to Width Ratio=5 mm3 mm≈1.67\text{Length to Width Ratio} = \frac{5 \, \text{mm}}{3 \, \text{mm}} \approx 1.67Length to Width Ratio=3mm5mm≈1.67
- Table Percentage:
Table Percentage=(2 mm3 mm)×100≈66.67%\text{Table Percentage} = \left( \frac{2 \, \text{mm}}{3 \, \text{mm}} \right) \times 100 \approx 66.67\%Table Percentage=(3mm2mm)×100≈66.67%
- Depth Percentage:
Depth Percentage=(2.5 mm3 mm)×100≈83.33%\text{Depth Percentage} = \left( \frac{2.5 \, \text{mm}}{3 \, \text{mm}} \right) \times 100 \approx 83.33\%Depth Percentage=(3mm2.5mm)×100≈83.33%
Relevant Information Table
| Measurement | Value (mm) | Formula | Result |
|---|---|---|---|
| Length | 5 | – | – |
| Width | 3 | – | – |
| Table Width | 2 | – | – |
| Depth | 2.5 | – | – |
| Length to Width Ratio | – | 53\frac{5}{3}35 | 1.67 |
| Table Percentage | – | (23)×100\left( \frac{2}{3} \right) \times 100(32)×100 | 66.67% |
| Depth Percentage | – | (2.53)×100\left( \frac{2.5}{3} \right) \times 100(32.5)×100 | 83.33% |
Conclusion
A diamond ratio calculator is a valuable tool for assessing the proportions and dimensions of a diamond. By calculating the length-to-width ratio, table percentage, and depth percentage, you can gain a quick understanding of a diamond’s shape and brilliance. This information is essential for both buyers and sellers in evaluating the quality and value of different diamond cuts.