Invincible, indomitable, inflexible, indestructible: the Greek word “adamas”, which translates as "diamond", has multiple meanings associated with one of the most notable qualities of diamonds – their hardness.

These stones take millions and millions of years to form. They have been known since 3000 B.C. in the East and were introduced in Europe by Alexander the Great. The brilliant cut was discovered towards the end of the 14th century and, soon after, diamonds began to be set in engagement rings. They have since come to symbolise eternal love, boundless loyalty, and unbreakable bond.    

present day

Every diamond is unique, extremely simple, and yet infinitely complex. The 4 Cs (cut, colour, clarity, and carat) are the traditional units of measurement, the components of cut, colour, clarity, and weight all interacting to give the diamond its unique beauty and character.

At Algerini, we pride ourselves on years of experience to guide you in choosing your dream diamond. A stone unlike any other. Our unique pieces are always accompanied by a certificate of authenticity for each purchase.

The 4 Cs of brilliance

Algerini is a member of the Italian Association of Jewellers
(Borsa dei diamanti d’Italia)


The cut of a diamond has the most effect on the stone’s beauty and brilliance. Quality varies, from excellent to poor, depending on the skill of the craftsman.


The colour of a diamond can significantly affect its value. The clearer a stone appears, the rarer it is. Quality varies ranging from D to Z in descending order. 


Experts will look at the presence and location of inclusions (crystals of diamonds or other minerals contained in the stone) and defects (very slight surface markings) to determine the clarity grade of a diamond. The scale ranges from Flawless to Included.


The weight of a diamond is expressed in carats, one carat equalling 0.2 grams or 100 points. The word carat came into being as a derivation of the word carob, as carob seeds, weighing one-fifth of a gram, were used to counterbalance the scales of gem traders in ancient times.