Roberto Coin Two-Tone Gold Diamond Necklace

18ct two tone gold and diamond and gem set necklace, Roberto…
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18ct two tone gold and diamond and gem set necklace, Roberto coin, Italy, comprising of an anchor link chain supporting a continous line of textured gold rondells centring a graduating fringe of textured bars or batons, decorated at intervals with pave-set diamonds together weighing approximately 0.75 carat, completed by a toggle and annular ring clasp decorated with a cabochon sapphire and circular-cut ruby, gross weight approximately 59.60 grams, signed Roberto coin, length 400 mm adjustable 450 mm, IItalian workshop registration and maker's marks.

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  • Carat - A carat (abbreviated "ct") is a unit of measurement used to describe the weight of a diamond or other gemstone, and separately is a unit of measurement used to describe the weight of precious metals such as gold,.

    For gemstones, one carat is equal to 0.2 grams or 200 milligrams. The weight of a diamond is one of the Four Cs (along with cut, colour, and clarity) that are used to determine a diamond's value.

    It is important to note that a diamond's weight does not necessarily correspond to its size. A diamond's cut, which affects how well it reflects light, can make a diamond of a lower weight appear larger than a diamond of a higher weight. Additionally, the carat is not the only factor to determine the value of a diamond, other factors such as clarity, colour and cut are important too.

    In the gold industry, the purity of gold is measured in carats (abbreviated "ct"), with 24 karats being pure gold and lower carat numbers indicating a lower purity level. So, for example, 18 carat gold is 18/24 or 75% pure gold, and 12 carat gold is 12/24 or 50% pure gold.
  • Cabochon Cut in Jewellery - A cabochon cut is a type of gemstone cutting where the stone is cut and polished in a convex shape with a flat bottom and a domed top, with no facets. This type of cut is typically used for opaque or translucent stones that have natural patterns or inclusions that are best displayed in this type of cut. Examples of stones that are often cut as cabochons include turquoise, opal, and moonstone.

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