Its become a very competitive business with everyone trying to come up with their own "Branded" diamonds, and jewelry and design, the so called Calla Cut is nothing more than a modified round stone it appears, this is the first I have heard of it, similar to an Ascher Cut which came out a few years ago and then just died!!! No one is buying Aschers anymore and the same will happen to this Calla. A cutter can make much more money with a "new" designer cut diamond and promote it, hopefully someone will fall in love with it and pay 30-40 more money than it should be.

If you love the cut then I would say go for it but be aware that the actual value will never come back to you since it is not main stream. over time, the round diamond has proven itself the most popular. We have sold many princess cut diamonds the past 5 years but even those have slowed down. We almost never sell any marquise diamonds lately, all these cuts are cyclical, the round diamond has been most consistent.

The Jeweler who told you about certified cut may have meant that he cant distinguish the table
and the depth to determine if the diamond is a good cut or not. More than likely he is blowing smoke and trying to get you to "doubt" the Calla Cut. When a diamond is sent to the laboratory such as the Gemological Institute of America (GIA) or European Gem Labs (EGL) they are evaluated for Color Cut Clarity Carat Wt. hence the "4 C's" of the diamond. The cut or of the table and depth ratios are the reason the diamond has "fire" or lacks "fire".

If a diamond is cut with a table of 60 and a depth of 60 without getting too technical, you will have a stone with fire. An "Ideal" cut which means maximizing the light back to your eye would be a 55 table and a 61 depth. This is also known as an American Ideal cut or a Tolkowsky Ideal cut (tolkowsky was a famous mathematician)

Certified cut and certified stones are one of the same, if you have a diamond that is "certified" or lab graded it will have the cut evaluation which wont mean much to you. Just look at the diamonds and see if they have "fire" if it does they are cut well, if it lacks brilliance something is not cut to full potential. You can mfg a ring which will look like the "calla" for less money with well cut marquise diamonds and a round stone in the center. The trick is to get high color (F-G) and very well cut diamonds all matched.