da sapere — March 22, 2019 at 6:00 pm

Diamonds: be careful to symmetry





Beware about symmetry: the cut of a diamond can enhance or make a less brilliant ring. Here’s how to find out.

While you’re ready to invest part of your savings in a diamond ring, think through how to choose the jewel. Of course, a diamond is forever: for this reason it is worth to make a careful choice. You already know what are the four C. You have already read our guide How to choose the diamond ring and How to choose a diamond. But there is still one thing to know: you must pay attention to symmetry. Yes: a diamond can also be «a bit faulty». In this case it will shine less and have less value in the future.

Il diamante ovale da 88 carati messo all'asta
Il diamante ovale da 88 carati messo all’asta da Sotheby’s

What does symmetry?
The symmetry refers to the precision, the shape and arrangement of the diamond facets. The brilliant-cut, for example, has 58 (or 57 if it has not the one on the bottom tip, the culet) that must be perfectly symmetrical: is not simple. We must say that identifying the symmetry is not easy: the Gemological Institute of America (GIA) has put 15 years and has studied 38 million diamonds before deciding how to judge the symmetry of a diamond, in particular the round, brilliant-cut. At the end of so much effort it has established the parameters and classification. The symmetry can be Excellent, Very Good, Good, Fair and Poor.

Anello con diamante solitaire da oltre 10 carati
Anello con diamante solitaire da oltre 10 carati

Because it is important?
Think about it: a diamond should be as transparent as possible to let in light inside. Then, it has to reflect the light through its facets. If these are not perfectly symmetrical, even the sparkle of light will not be perfect. What’s more, the diamond could spark very little because the stone can not make out the light from within. It happens often? Fortunately no. Once time ago, those who cut the stones performed all by hand, in poorly lit environments. Now that the technology helps to avoid mistakes, or almost.

A sinistra, un diamante con una simmetria classificata come Ottima. A destra, una pietra classificata con simmetria Povera
A sinistra, un diamante con una simmetria classificata come Ottima. A destra, una pietra classificata con simmetria Povera

What should you watch?
The images you see are eloquent: the differences in the cut may be minimal, or jump to the eye. The best thing to do is compare different diamonds with the same cut, and in the same light: choose the one that seems to shine better, that you like the most: most likely you will not find a not symmetrical diamond. Cosimo Muzzano




A sinistra, un diamante con simmetria giudicata Eccellente. A destra, simmetria buona. La differenza è poco visibile
A sinistra, un diamante con simmetria giudicata Eccellente. A destra, simmetria buona. La differenza è poco visibile
Diamante taglio brillante
Diamante taglio brillante
Anello art déco con diamanti
Anello art déco con diamanti
Classico solitarie con brillante
Classico solitarie con brillante
Il diamante in vendita da Sotheby's
Il diamante flawless da 102 carati venduto da Sotheby’s
Orecchini in oro bianco, platino e diamanti
Orecchini in oro bianco, platino e diamanti
Chanel Comètes, orecchini Étoile Filante, con 93 diamanti taglio brillante e montatura in oro bianco a forma di stella
Chanel Comètes, orecchini Étoile Filante, con 93 diamanti taglio brillante







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