Sorting Diamonds: The Art and Science

One of the things I’m most proud of is the diamond sorting process at K. Rosengart. When it comes to sorting diamonds, we are able to do so in a way in which our clients are never disappointed by what they receive. Really, this is no small feat!

Sorting Diamonds | Diamond Sorting Process | K. Rosengart

There are so many different categories that determine which diamonds get put into what quality. The assortments are endless, but at K. Rosengart, we divide all our stones by color clarity and carat weight. We also adhere to Gemological Institute of America (GIA) standards to ensure consistency and to provide our clients with a baseline for understanding. This last part is key, as it clearly defines what our clients can expect from us.

The Sortascope

Sorting diamonds is truly both a science and an art form. The different categories of color and clarity can be considered a science, while the art is using the human eye and making judgement calls about whether diamonds are VS1 or VS2, etc. To enhance the human eye's abilities, we use a special tool called a sortascope during our diamond sorting process.

A sortascope is essentially a microscope with a tray that holds the stones, so you are able to sort thousands of carats in an very efficient way. As the stones are looked at, they are reviewed for color clarity and the overall cutting. In addition, when the diamonds first arrive on my desk in New York, we test for treated diamonds to ensure our clients are only getting 100 % natural stones.

Going Over and Above

Our diamond sorting process often goes over and above testing and overall grading, as we happily help our clients meet specific criteria. For example, a client might request there be no fluorescence in a melee parcel. In this instance, we would take extra time and care to pull out any fluorescent stones.

Another special request we frequently meet is in regard to stone sizes. Although our diamond inventory is kept by mm size, a parcel marked 1.5 mm could range from 1.45 mm to 1.55 mm. A client might specify a need for stones ranging from 1.48 mm to 1.5 mm, and we would proudly provide just that.

Will My Diamonds Be the Exact Size I Ordered?

Diamond Sorting Process | Sorting Diamonds | K. RosengartAt K. Rosengart, we pride ourselves on giving you exactly what you ordered. So many in the industry complain that there is too much of a range when it comes to mm sizes. That’s one of the many ways we win our clients over, as not only do we provide perfectly graded stones, but we also pay close attention to details.

Sieve plates are used industry wide and are considered to be a precision measuring instrument specially made to meet the strict requirements of the trade. At K. Rosengart, we think that still offers our clients too much of a range - so we take it one step further.

It’s essential to have accurate measurements on all your stones when you place your diamond order. In addition to sieving, we also use a mm gauge to ensure that you get exactly what you asked for.

With designers, manufacturers, and independent retailers producing jewelry using CAD, we find it’s crucial to be spot on. We welcome our clients to be as specific as possible, and we are happy to accommodate any size requirements requested. It can be extremely frustrating to be in the final stages of setting diamonds in your piece of jewelry and not be able to complete the piece because the diamonds sent to you are the wrong size. Whether you are ordering one diamond or 5,000 diamonds, we want you to know we are using all the tools available to ensure you get exactly what you ordered.

What About Diamond Color?

The same way that clients want specific sizes, they also request specific colors. Typically, a parcel would be sorted and the range could be FG color, but if a client only wants the F color, then that’s what we would do. We give you only what your specific need and want is. It’s a tedious process, but one that we feel is what separates us from everyone else.

We like to think of ourselves as your in-house diamond department. There is immeasurable value in how we prepare the diamonds so they arrive on your desk exactly as needed to suit your specific needs.

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