Octagon Ring

In 1989 Roberto Callegari created a handcrafted rose gold ring with a magnificent 8 ct antique cut diamond. A unique jewel that combines tradition and innovation by referring to the figure of the octagon.

In the East, specifically in China; the octagon represents one of the greatest known symbols of the Taoist current. This symbol is called Bagua or Pakua. The meaning of bagua (ba gua) is eight numbers. They can be considered symbolic representations of the family units. They represent in fact father, mother and the various degrees of the children, both females and males. It is from this meaning that the Octagon ring is born, a creation that refers to the family and to the importance of bonds with the people we love.

This geometric elegance inspired the new collection that celebrates our 110 years. Elisabetta, Andrea and Beppe, the third generation at the helm of the family business, have reinterpreted the Octagon ring through the use of innovative materials by combining titanium with pink gold. The contrast between the use of these materials and the uniqueness of the stones makes the octagon ring a symbol of history, passion and craftsmanship.

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Diamonds: our selection process

Each diamond is unique, within it there are specific qualities that determine the value of each individual stone.
These are the so-called 4C, from the English Carat, Color, Clarity and Cut, respectively, carat, color, purity and cut. The international classification system uses this method to describe a diamond and determine its value.


To express the weight of the diamond, the carat is used as the unit of measurement. One carat (ct) is equal to 1/5 of a gram (0.200 grams); a 5-carat diamond, therefore, will weigh 1 gram.


Many think that diamonds are only colorless stones, but in reality this is not the case. Each of them has a different shade of color given by its chemical composition. Colorless diamonds are recognized as rarer and more valuable. The international classification system orders the color and consequent quality of diamonds on a progressive scale that goes from the letter D (colorless) to the letter Z (light yellow), in which the D represents the total absence of color and therefore the diamond of greater merit.


Purity, that is the quality of a stone to be "inclusions" free, is a further parameter for the price of a diamond. Depending on the number, color, size and position of these internal characteristics, the degree of purity of the diamond is determined according to a descending scale between I.F. (Internally Flawless - no defects visible at 10x) and the I. (Included - inclusions evident to the naked eye).


The most important feature for us is the cut, that is the process of faceting, polishing and carving of the rough stone in order to maximize the reflection and refraction of light. The secret of a diamond's beauty lies in the complex interaction between stone and light: in the way in which light meets the surface of the stone; in the quantity of it that manages to enter the diamond; and in the way in which and in what form it returns to the eyes of the observer.
The result is a magnificent display of three optical attributes: brilliance, that is the combination of reflections of white light coming from the surface and inside of a diamond; fire, a term that refers to the "flashes" of color emitted by a diamond; and the sparkle, consisting of flashes of light visible when the diamond, the light source or the observer move.

Roberto Callegari's diamonds selection process is defined by the use of gems with the following characteristics: Color (from D to G), Clarity (from VS to SI) and Cut (from Excellent to Very Good).

13 July 2021