You can always have a certified appraisal for your jewellery items specially those with precious stones such as diamond. The appraisal would include the real market value on the day of making the appraisal. The certificate would also includes detailed information about your jewellery such as the metal karat, colour and weight as well as the stones’ size, clarity, cut, and colour. A picture of the item will be added to the certificate which an be issued with the owner’s name on it. Remember that insurance would ask for your appraisals in case the insured item was lost, stolen or damaged…etc.