REPUBLICAN DIAMOND MANUFACTURING UNITARY ENTERPRISE
GOMEL PRODUCTION ASSOCIATION "CRYSTAL"
BRANCH "ENTERPRISE JUWELLER"


At purchase of a jeweller ornament it is necessary to pay attention to the following:

- obligatory presence of a brand of the Byelorussian inspection of assay supervision;
- the front surface excludes cracks, bowls, agnails;
- inserts are fixed in a frame motionlessly;
- pair products are selected on the size, the form and a kind of a facet, color of inserts.

USEFUL ADVICES:

Jeweller ornament demands the careful treatment and attentive care:

Try to not suppose mechanical damages; interactions with aggressive chemical environments (synthetic washing-up liquids, medicines, cosmetics, perfumery).

1. Jewels from gold without inserts it is possible to wash out in a soap solution with addition of liquid ammonia, further to rinse in clean water, to wipe with soft fabric.

2. Jewels with inserts are to wipe cautiously with the fabric moistened in a similar solution only polluted surfaces, then to wipe with clean fabric.


IT IS NECESSARY TO KNOW ABOUT IT:

At purchase jewel with brilliants
in the commodity check should be included:

- exact weight in carats;
- a class of color;
- a class of cleanliness;
- the form of a stone;
- the exact sizes of a stone in millimeters.


How correctly to choose a jeweller ornament with a brilliant.

CARAT

The carat is a unit of weight, not of the size. Since 1913 the weight of carat is considered equal to 200 mg, or 1/5 grammes. On weight brilliants of all forms are subdivided into three groups:

- fine (0.29 carat)
- average (from 30 till 0.99 carat)
- large (from 1.00 and more carat)

CLEANLINESS

Depending on admitted defects brilliants are classified on groups of cleanliness. On the high quality brilliants which are not having defects and with insignificant defects seen traces of grinding, porosity, rundist, fine chips are not supposed. 
Brilliants are qualified on the corresponding scale named a scale of cleanliness.
This scale begins with 1 (clean) and comes to the end 11 (with inclusions) and based on visibility of various inclusions at 10 multiple increase.


COLOR

White color of brilliants can change from cold winter up to warm summer. Brilliants are classified on a color scale which begins from 1 (colorless) and comes to the end 9. Color distinctions between two brilliants are very thin, therefore color of a stone is defined at corresponding illumination in comparison with the standard. The colorless stones appreciated as 1 are very expensive because of rarity and are at top of the Pyramid of quality of brilliants.


FACET

The brilliant faceted with observance of parameters, designed under formulas, reflects inside a maximum quantity of beams and disseminates them at the top a stone so "plays" - sparkles and èñêðèòñÿ. Therefore well faceted brilliants are closer to top of the Pyramid of quality, than "deep" or "low" in which light is lost or passes through a bottom of a stone that results in reduction of game and, accordingly, the prices. At a facet of diamonds in brilliants the greatest distribution was received with two kinds of facets:

- a diamond facet. The diamond type of a facet is applied basically at manufacturing round and ôàíòàçèéíûõ brilliants;

- a step facet. Step type of a facet apply at manufacturing brilliants of the rectangular form.


THE FORM

The form of a brilliant should provide his external beauty, a high degree of game and shine.
The most widespread forms of brilliants:

- round (a simple and full facet)

The round form of a facet is considered classical, brilliants of this form are most symmetric and capable to reflection almost all light which will penetrate into them. Qualitative brilliants have "good round " form.

- fantasy (the form "pear", "marquis", "oval").
- rectangular ("baguet")
- rectangular with the cut off corners ("emerald")