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The word opal means “precious stone”, and opals are primarily found in Australia. A distinction is made between opals with a white or black body color. The black opal is the most valuable, because it is rarer than the white. Color variations are due to light diffraction caused by the internal structure of the stone, which comprises spheres of cristobalite that are one ten-thousandth of a millimeter in diameter. It has a hardness of 5.5 - 6.5 on the Mohs scale.

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A brief history of design

Finding a piece of furniture and wondering if it would suit your living room is one thing, but to truly comprehend the era and influence of the style of the item is another. To aid you in better understanding the different styles and origin of items on auction, we have provided a brief history of styles and trends of each era starting from the 16th century until the present day.