London Blue Topaz is a darker shade of blue compared to Swiss Blue Topaz. It gets its name from its association with the city of London, where it was first treated using heat and irradiation techniques in the 1970s. London Blue Topaz has a hardness of 8 on the Mohs scale like Swiss Blue Topaz. However, due to its darker color, it may not have.. London Blue Topaz is known for its deep blue color, which can range from a pale blue-grey to a rich, deep blue. The color is the most important factor in determining the value of a London Blue Topaz gemstone. The gemstone has a hardness of 8 on the Mohs scale, which makes it a durable option for everyday wear.
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By definition, London Blue topaz is a topaz stone that has a very specific, inky shade of blue. It's darker than regular topaz but lighter than a sapphire. In fact, the colour is best described as a halfway point between the two. The topaz stone is composed of fluorinated aluminium silicate. It measures in with a hardness of eight on the Mohs.. Topaz scores an 8 on Mohs scale, which makes it a hard and durable stone that's perfect for everyday wear. However, as with all gems, a topaz too must be protected from hard impacts. At the cutting stage, the perfect cleavage of this stone can present a challenge. But usually, cutters orient the table of the stone 5-10% off the cleavage plane.
