Lab-Grown Diamond Prices – March 2025
For the first time, PriceScope is proud to launch our comprehensive Lab-Grown Diamond Price Analysis, at the beginning of each month, we will provide actionable insights into this rapidly evolving…
When it comes to evaluating a diamond’s quality, most people focus on the 4Cs: carat, color, clarity, and cut. Among these, the cut is often considered the most crucial because it directly impacts how a diamond sparkles and shines. Two key aspects of a diamond’s cut are its depth and table, which significantly influence its brilliance and overall appearance. In this guide, we’ll explore what these terms mean and how they affect the beauty of a diamond.
What is a Diamond's Table?
Image Source: Robbins Brothers
The table of a diamond refers to its flat, top facet, the largest facet that you see when looking at the diamond from above. The size of the table is crucial because it allows light to enter the diamond and then reflects it back, contributing to the diamond’s brilliance.
Ideal Table Percentages
| Shape | Round | Oval | Princess | Cushion |
| Table % | 54 – 57 | 52 – 60 | 63 – 69 | 58 – 63 |
| Depth % | 61 – 62.5 | 60 – 68 | 69 – 76 | 58 – 66 |
The ideal table percentage varies depending on the shape of the diamond. For example:
- Round Cut Diamonds: An excellent table range is 54% to 57%.
- Princess Cut Diamonds: The recommended table range is 69% to 75%.
Table percentage is calculated by dividing the width of the table by the overall width of the diamond. A well-proportioned table enhances the diamond’s ability to reflect light and sparkle.
Shop Lab-Grown Diamonds: Some of our vetted vendors offer lab-grown diamonds – both loose or set in finished jewelry. Check out Whiteflash and their precision cut lab grown diamonds, and James Allen extensive online collection.
What is a Diamond's Depth?
The depth of a diamond is the distance from the table (top) to the culet (bottom), expressed as a percentage. This percentage is determined by dividing the diamond’s height by its width. The depth percentage affects how light travels through the diamond and is reflected back to the viewer’s eye.
Ideal Depth Percentages
As with table size, the ideal depth percentage varies by diamond shape:
- Round Cut Diamonds: Ideal depth is between 59% and 62.6%.
- Princess Cut Diamonds: Ideal depth ranges from 68% to 74%.
Image Source: Cape Diamonds
A diamond that is too shallow or too deep can result in light leaking out from the sides or bottom, reducing its brilliance.
The Impact of Depth and Table on Brilliance
Together, the depth and table of a diamond determine how effectively it reflects light. A diamond with optimal depth and table proportions will capture light and reflect it in a way that maximizes sparkle and brilliance. On the other hand, diamonds with poor depth and table proportions may appear dull or lackluster.
Excellent Diamond Depth of 61%
How to Choose the Right Diamond
When choosing a diamond, consider the following tips:
- Look for Ideal Proportions: Use the recommended depth and table percentages as a guideline for selecting a well-cut diamond.
- Balance with Other Cs: While cut is king, don’t forget to balance it with the diamond’s carat, color, and clarity to ensure you get a diamond that meets all your criteria.
- Seek Expert Advice: If you’re unsure, consult with a diamond expert who can help you evaluate the cut quality and other factors.
If you're in the market for lab-grown diamonds, consider checking out the offerings from our vetted vendors. A few reputable retailers to consider include Whiteflash, James Allen all of which have a comprehensive online collection of certified lab-grown diamonds.
Bottom Line
The depth and table of a diamond play a significant role in its appearance and value. There’s no one-size-fits-all “best” depth and table for every diamond; instead, the ideal proportions depend on the diamond’s shape. By understanding these elements and considering the recommended ranges, you can choose a diamond that maximizes brilliance and beauty.
For more personalized advice and recommendations, reach out to our diamond experts who can guide you in finding the perfect diamond for your needs and budget.
