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  • Metal Guide

    As jewellery anoraks we believe that the more you know about different precious metals the more interesting they become and the more transparent your online jewellery purchasing becomes. This section provides you with a little bit of information on the properties that some of the precious metals used in a Michael Isaac creation possess. If you are a fellow anorak like ourselves then read on…

    “Fine jewellery only becomes all the more enjoyable, all the more alluring, the more you come to know about precious metals and gemstones. Many years on and I’m still as intrigued by this world today, as I was when I first set out”.

    Michael Isaac, Creative Director, Gemologist

    Metal Guide


    Known as the everlasting metal, platinum is the rarest of the precious metals. Pure white, as it is worn and ages it develops a beautiful and distinctive soft dull finish known as patina. It is the least reactive precious metal, both strong and durable and is highly resistant to corrosion or tarnishing. Platinum’s superior durability makes it the most secure metal for holding in diamonds and gemstones which is why many of the world’s most important diamonds, including the 60ct Taylor Burton diamond use platinum as their choice of setting.

    Platinum is heavier than other precious metals and its high density gives it a more opulent and luxurious feel. Platinum is 95% pure, and stamped 950, this high purity makes it hypoallergenic so it can be worn everyday and is ideal for those with sensitive skin.


    Metal Guide

    White Gold

    White gold has the same fundamental properties as yellow gold, but is combined with different alloys, such as silver and palladium, that are white in nature to give it its colour. White gold is usually plated with rhodium, an even whiter metal to give it a white bright luster, Many pieces in the Michael Isaac collection are not rhodium plated as we appreciate the natural gold colour.


    Metal Guide

    Yellow Gold

    This is gold’s natural colour. Yellow gold is combined with other alloys such as silver and copper to strengthen it and give it its prized rich sheen. How yellow the gold is is determined by its gold content. Higher gold purity like content 22ct an 18ct is generally deeper and with a more saturated yellow hue as it contains content of pure gold.

    Metal Guide

    Rose Gold

    Different alloys are combined with pure gold to create different shades. Gold is graded by its purity, the higher the gold content, the higher the purity and therefore the higher the karat weight. 24-carat gold is this metal in its purest form. It is seldom used in making diamond jewellery as it lacks the high polished look and durability that we expect from our diamond jewellery. Various alloys are added to the pure gold to create different beautiful shades. The carat system used by jewellers refers to the quantity of pure gold in the mixture.

    Golds purity is measured in karat, abbreviated to ct. For example, 22 carat gold is 22 parts pure gold to 2 parts alloy and 18ct gold is 18 parts pure gold to 6 parts alloy.

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