An Art Deco Diamond And Ruby Bracelet, Circa 1935 Designed as a series of articulated geometric plaques, with pierced and openwork detail, set throughout with brilliant and single-cut diamonds and calibré-cut rubies, diamonds approximately 4.45 carats total, one ruby deficient, length 16.4 cm Estimate: £4,000 – 6,000 US$ 6,300 – 9,500 This is a very […]Continue reading »
Diamonds Consumer Information
As provided and validated by various gemmological organizations, laboratories and the "World Jewelry Confederation CIBJO"
diamonds remain the most popular. There are more than 20 subtle grades of colour, identified in alphabetical order from D-Z. Variations are so slight that colours must be graded by an expert under controlled lighting conditions and compared against a master set for accuracy. Those at the upper end of the scale will be more expensive, as they are rarer. However, they are difficult to discern with the naked eye. The D-Z colour grades only apply to yellow and brown-tinged stones. If these colours are intense (Z+) in a diamond, they are referred to as “fancy-coloured”. For other colours such as blue, pink, red, green, etc., the colour does not need to be intense to be considered fancy as these colours are rare and highly prized. For fancy colour diamonds, the market value is determined almost exclusively by the intensity of the colour, which can in some diamonds significantly outweigh the effects of lower clarity and of a poor make.
fingerprint within the stone. Usually invisible to the naked eye, these tiny marks are minerals or fractures which appeared while the diamonds were forming in the earth. The number, type, colour, size and position of these inclusions can affect the value of a diamond. Many can only be seen by a 10-power magnification loupe or stronger. Flawless diamonds are rarer and thus more expensive. Small inclusions do not affect the beauty of brilliance of the diamond however.
proportions of a diamond will determine its appearance. The shape of a diamond is a matter of personal taste, with the round brilliant cut the most popular. Other shapes are the asscher, cushion, emerald, heart, pear, marquise, oval, princess and trilliant.
particles; these particles damage the diamond’s internal structure, which may change the color. The longer the bombardment, the more intense the color. Color: The most recent and sophisticated development in diamond colour improvement is to treat brownish coloured diamonds to improve their colour. The colour change is to either colourless or fancy yellow/green depending on the starting material.
percentage, symmetry and other crucial details. The most important factors when determining the quality of a diamond are known as the 4Cs.These are the diamond’s carat weight, its cut, its colour and its clarity. The key thing to note is that no one C is more significant than another. A particular combination of the 4 Cs can be chosen to suit a particular budget, occasion, design or jewellery piece.