P.zza S.Secondo,8 - 14100 Asti - Piedmont - Italy | Tel. +39 0141 592236 - fax: +39 0141 322210
E-mail: olivero@oliverogioielli.it



How to choose a diamond

You are about to choose a diamond, one of the most precious gifts from nature. The purchase of a jewel with a diamond deserves attention and knowledge.

A never-ending dream which crosses four continents

The ancient Greeks believed that diamonds were splinters of stars fallen to Earth; others said that they were Gods' tears. The truth is that the exact origin of diamonds is still mysterious even to scientists and geologists. Diamonds formed billions of years ago in the bowels of the earth. Their composition is simple: crystallized pure carbon. Extreme pressure and temperature have miraculously turned pure carbon into diamonds and volcanic forces carried it up to the surface of the planet.
Diamonds, found for the first time in India more than 2800 years ago, today are extracted in Australia, Canada, Russia and Africa, the latter being the continent in which in the late nineteenth century, the modern diamond industry made its appearance.

Light and fire: a miracle of nature that releases its beauty

Tagli più conosciuti dei diamanti
A rough diamond may well go unnoticed, so that most people wouldn't even look at it. It is thanks to the ability of professional cutters that a diamond unleashes all its magic and beauty. Diamonds cut is an art that does not admit mistakes and is handed down from generation to generation. The beauty of a diamond, in fact, also depends on how it is cut and reflects the light. The cut is the set of facets, through which the rough diamond is turned into a faceted gem. The right cutting proportions will guarantee a greater amount of light and the diamond will shine with its fire, brilliance and lustre. The shape , on the other hand, is rather a matter of personal taste of those who choose and wear it. The most popular cut is the brilliant cut with round form but there is a wide variety of shapes:
marquise (or navette), emerald, oval, drop, princesse, etc...
New technologies and studies on diamonds cuts reached very high degrees of perfection.

The solitaire

Anello solitario con diamanteIt is just magical, self-sufficient and with no need of anything else to highlight it.
Maybe it is the most appreciated jewel, in particular when it comes in the form of a ring.
It is traditionally worn on the left ring finger as engagement ring, or at the décolletage, and it might earrings.

Riviere veretta

veretta riviere diamanti

The light of several diamonds that follow one another makes every veretta unique.


Bracelet with diamonds

bracciale tennis diamanti

It is called tennis bracelet. While entering the field at Flushing Meadows, Champion Chris Evert noticed that she was not wearing her talisman on her wrist and asked: Where is my tennis bracelet?".
Since then, this bracelet has been known as a tennis bracelet.



Trilogy ring

anello trilogy diamante
The triumph of romanticism.
A trio of diamonds symbolizing the love of yesterday, today and tomorrow.


The four characteristics of a diamond

The famous 4 C of the diamond are renowned all over the world. This classification allows an understanding of the quality and rarity of diamonds.


It is the only one of the four characteristics dictated by man. Nature establishes the characteristics of the diamond, but it is the ability of the master cutter to reveal its brilliance, brightness and lustre.
If a diamond is cut with a too deep or too low pavilion, light is lost at the sides or the base, reducing the beauty and brightness of the diamond.


The assessment of the colour of a diamond for the purpose of classification is obtained by measuring the degree of proximity to the total absence of colour.
International scale of colours: *(G.I.A.)
D – totally colourless
E – Exceptional white +
F – Exceptional White
G – rare white
H - White
I – Slightly tinted white
J - Slightly tinted white
k – Slightly coloured white
L - Slightly coloured white
M – Very light yellow
N - O - Very light yellow
P - R - Very light yellow
S - Z - Very light yellow
* Gemmological Institute of America


Nature makes the diamond unique, leaving some natural characteristics, called inclusions, which are the fingerprints of the diamond. However, the majority of internal and external characteristics of diamonds are not visible to the naked eye and, although visible with a 10 times magnifying glass, only an experienced and trained eye can identify them. The number, size, colour and position of each inclusion in the diamond determine the degree of clarity and, therefore, the rarity of the gem.
FL (flawless)
IF (No inclusions, only blemishes are visible to a skilled grader using 10x magnification)
VVS 1-VVS2 (Inclusions are difficult for a skilled grader to see under 10x magnification)
VS1-VS2 (Inclusions are clearly visible under 10x magnification but can be characterized as minor.)
SI1-SI2 (Inclusions are noticeable to a skilled grader using 10x magnification.)
P1-P2-P3 (I1-I2-I3) (Inclusions are obvious under 10x magnification and may affect transparency and brilliance.)

Carat weight

The weight of diamonds, as well as the weight of other gems, is expressed in carats.
The word carat has ancient origins, when the seeds of the carob tree were used to weight gems, because of their surprisingly regular weight. Currently, the carat is a decimal unit of measurement corresponding to 1/5 of a gram, divided into 100 points: for example, 0.75 carats correspond to 75 points or to 3/4 of a carat. The more a diamond weighs, the more it is big and rare in nature, and its price increases exponentially. However, the value of a diamond does not depend on its weight only.
Two diamonds with the same weight can have a different value depending on the cut, colour and internal characteristics.

Did you know that...

The first text mentioning a diamond is a Sanskrit text dating back to the fourth century B.C. and it refers to the sale of this stone, already known as the hardest, rarest and most valuable among the stones.
At the end of the sixteenth century, the first brilliant cut with 58 facets, also called Baroque cut, was created.
The northern light allows you to better evaluate the colour of a diamond. That is why in Antwerp and other markets, the negotiating tables are turned to face the north.

:: back to main ::

authorized Dealer