WHAT IS A GEMMOLOGICAL CERTIFICATE
The gemological certificate is a real identity card of the gem, where all the characteristics are declared, and it is a certificate that must be drawn up by a professional Gemmologist or an independent gemmology laboratory. In fact, professional experts, thanks to specific equipment, are able to evaluate and certify the characteristics that the precious presents.
The certificate shows the declaration of the type of pearl (natural or cultured), the formation environment (salt water or fresh water), any treatments to which they have been subjected, weight, dimensions, color, regularity of the surface, shape and drilling; on request, for the core culture beads, the thickness of the pearly layer can be identified. In these cases, further laboratory analysis with an X-ray instrument is necessary.
READ THE GEMMOLOGICAL CERTIFICATE
- Code: refers to the product sales code;
- Diameter of the bead: the measurement is performed with a micrometer, (example: 5.00 – 5.28) and the measurement is expressed in mm;
- Pearls type: identifies the common name with which they are known in the market es. (Akoya);
Number of pearls: we declare how many pearls the jewel is made of (whether it be a necklace or a jewel);
- Growth environment: indicates if it is cultivated in fresh or salt water;
- Origin: refers to the geographical area in which they were produced;
- Oyster: the scientific name of the oyster, es. (Pinctada Maxima);
- Shape: indicates the shape of the pearl;
- Body color: refers to the base color of the body, eg (White);
- Hypertone: can be seen as a form of gloss or a set of secondary color (s) visible on the surface;
- East: it is the optical effect that makes the surface of translucent pearls, rich in multicolored reflections and characterized by a well defined point of light, called “shining” or “splendor”, observable when the pearl is placed in the shade. It is produced from the set of optical effects, interference and diffraction.
- Gloss: indicates the degree of light, eg (Great);
- Surface characteristics: refers to the natural characteristics present on the surface of the pearl, ex. (small signs barely visible at o.n.)
Quality of the pearling: indicates the quality of the thickness of the mother-of-pearl (nacre) of which the pearl is made. Whether it is a nucleus or whether it is a total pearling, as in the case of some freshwater, Keshi or natural pearls;
- General aspect: refers to the uniformity of the composition of a necklace (thickness of the nacre, brightness, surface aspects, color and diameter);
- Degree: it is the parameter with which a pearl is classified in the context of its group. Eg. Akoya pearls (Hana Dama) or South Pacific pearls (A / B);
- Weight: the weight can be expressed in various units of measure, grams, carats or momme. The Momme is an ancient unit of Japanese measurement still used to measure the mass of cultured pearls. One momme = 3.75 grams = 18.75 carats;
- Length: the length is indicated for the necklaces;
- Drilling: indicates if a pearl is pierced and possibly has a through or half hole.
- Closure: refers to the metal of which the closure is made.
- Comments: any comments in latere es. (unique jewel);
- Treatments: possible color treatments es. (gray color obtained through Gamma rays)
The certificate therefore serves to protect the consumer, as it is the univocal certificate for a specific pearl, or a jewel with pearls, and certainly can not change its value but rather validate its authenticity.
Adriano Genisi graduated from the GIA, known for being among well-known international analysis laboratories. GIA (Gemologic Institute of America), was the first laboratory to arise in the world.