6.64 ct Royal Blue Oval Sapphire
A wonderful 6.64 ct oval sapphire in vivid royal blue colour. This beautiful gemstone would make a perfect sapphire pendant or ring especially if surrounded by sparkly diamonds.
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More care is needed with treated stones.
Sapphires can be treated to improve colour by a process called diffusion. Older stones treated in this way may only have treatment near the surface, so if you become aware that you or a customer has a stone treated in this way avoid repolishing.