Rapaport Diamond Report (RDR) for polished diamonds is named after the Jewish American diamond dealer Martin Rapaport, or by his nickname: “Mr. Bow-Tie”, because he only wears bow-ties. Rapaport Diamond Report In 1978 the RDR was first published. This is the most popular and well known report in the world diamond industry. The report […]
When the polish of the diamond is not good it affects the brilliancy, the fire and especially the luster of the stone. There are 3 defects that can affect the polish of the diamond: Polish Lines – These are very thin, crowded and transparent parallel lines that go in the polish direction of the […]
Girdle Surface Faceted Girdle – Uniformly divided into small and distinct segments. That’s the only girdle surface that the GIA grades. Polished Girdle – Appears smooth. Rough Girdle – Appears uniformly white mat. This is a natural girdle. * * The GIA certificate indicates only faceted girdle. Symmetry The symmetry in the […]
Diamond proportions Excellent proportions are very important to a diamond because they allow the greatest amount of light to be reflected from the crown. Four key characteristics of a diamond are created by proper proportions: brilliancy, fire, luster and scintillations. The round brilliant cut appeared in the 17th century. Since then it has gone through a […]
Diamond substitutes – the differences between Zirconia and Diamond There are two types of diamond substitutes, natural substitutes and synthetic substitutes. Natural diamond substitutes include: White Spinel White Sapphire White Quartz. Artificial diamond substitutes include: Synthetic White Spinel Synthetic White Sapphire Synthetic White Quartz Glass Cubic Zirconia – zro2 Moissanite Synthetic Diamond -Laboratory Grown […]
What are graining lines in the diamond? how do they effect the clarity, the quality and the color of the diamond? Graining Lines in the diamond, are a natural part of the diamond. They affect the clarity and the quality of the polish. The GIA note them in a comment in the Gemological certificate. There are […]
How can we differentiate between internal inclusions and cavities , to external imperfections and dirt? Here are several methods of evaluating the diamonds that will help you see the differences between the clarity characteristics and by that evaluating the clarity and the value of the diamond more accurately. The movement system: When there is an […]
COLOR OF DIAMONDS The most common color of diamonds is white. It usually appears with a yellow or grey or brown hue. the highest color is D, which is completely white, the lowest color is Z which has a very clear yellow hue. D,E,F – These are the whitest diamonds, colorless and are often called […]
The clarity grade of the diamond is determined by its clarity characteristics and by their size, position, amount, kind and color as well as by their appearance in the loupe. The clarity grade of a diamond is determined by its clarity inclusions that divide into three: 1. Internal Inclusions These inclusions affect badly the clarity […]
Color enhanced diamonds Color enhanced diamonds – This treatment is popular especially in small stones up to 0.15ct. The treatment is irreversible. The jewelry industry use the color enhanced diamonds a lot. The treated diamonds are much cheaper than natural fancy color diamonds and you can have a set of diamonds with the same color […]
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