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Blue diamonds are a rare form of natural diamonds that have a distinct blue hue. Their colour comes from the presence of boron in the crystalline structure of the diamond.
Most natural blue diamonds come from mines in South Africa and India. The Hope Diamond and the Smithsonian's Hope Diamond are two of the most famous blue diamonds.
The authenticity of a blue diamond can be verified by a certificate issued by a specialist laboratory, which will contain detailed information about the diamond's characteristics.
To clean and care for blue diamond jewellery, it is recommended to use a solution of warm water and mild detergent by immersing the jewellery in the solution and gently rubbing it with a soft toothbrush. Avoid the use of abrasive products or hot water, which can affect the appearance and brilliance of diamonds and mountings.