Certain diamond cutters have a tendency to salvage rough diamonds by implementing deeper cuts. It is crucial to understand that the purchase of a deep-cut diamond might not necessarily align with the best course of action for you. For instance, the visual and dimensional equivalence between a 0.80-carat diamond and a 1-carat diamond can be achieved if the latter is cut with increased depth. Presented below are a two examples that illustrate the concept of deep-cut diamonds.
The second important point while selecting a slightly deeper cut diamond with the right proportions would be to look at its overall dimensions in millimeters. For example, you might come across a round-cut diamond with 64% depth. However, if it has a thinner girdle and a larger table size, it might make up for the lost size. Thus, one of the best ways to analyze the visual appearance of a stone is to look at its dimensions in millimeters, as shown below:
Round 1ct. (Actual Examples)
Option 1) Deeply cut:
5.93-6.02x4.17mm – Table 55% Depth 68.8%
Option 2) Excellent Cut:
6.57-6.59x3.92mm – Table 58% Depth 61%
Option 3) Very Good Cut with 64% Depth:
6.30-6.34x4.03mm – 64% Depth Table 57%
Princess Cut 1ct. Square (Actual Examples):
Option 1) Deeply Cut:
5.03x5.01x4.00mm – 80% Table and 80% Depth
Option 2) Excellent Range:
5.47x5.39x3.87mm – 70% Table and 71% Depth
Option 3) Slightly Deep Cut:
5.48x5.37x4.08mm – 71% Table 76% Table.
The table imparts two significant insights:
- In round cut diamonds, a slightly deeper cut can lead to a smaller diamond, contingent on the stone. This difference is observable in millimeters, comparing excellent cut with very cut diamonds having a depth of 64%.
- In the case of fancy cut diamonds, this principle may not always hold true. It's possible to acquire a slightly deeper cut diamond with the same or larger millimeter dimensions as one with ideal proportions. It's important to note that fancy cut diamonds are crafted differently, and the establishment of ideal proportions by the GIA for such cuts is still under consideration. Therefore, opting for a slightly deeper fancy cut diamond, provided it has appropriate dimensions and a commendable table, could be a prudent choice if the price is right.
This leads us to the third critical aspect of diamond cut. While the cut holds importance, it's crucial not to excessively emphasize it, especially if budget constraints are a factor. While observing a diamond in person, the disparity between a very good and excellent cut is minimal. The GIA maintains strict criteria, and a minor discrepancy could result in a diamond being categorized as a very good cut rather than an excellent one. Therefore, if the depth, table, and other proportions align well, there's no hesitation in opting for a very good cut diamond. This advice extends to the polish and symmetry level decisions for both round and fancy-cut diamonds. While an excellent cut is desirable, it might not be justifiable if the associated price increase is substantial.
The fourth and final takeaway is that a detailed examination of cut proportions and specifics is essential for each stone, based on its shape. It's crucial to recognize that the guidelines for selecting a round diamond cannot be uniformly applied to a radiant cut diamond. To ensure precision, consult our comprehensive guides tailored to each specific shape, which will provide you with the exact criteria to seek and how to evaluate proportions: