The value of a diamond is worth whatever someone will pay you for it.
Your question reflects the vagaries of the market more than it reflects the value of diamonds.
Sometimes, people pay more for a diamond than necessary. Then when a subsequent sale is attempted, the mark-up paid in the first purchase is lost, so the seller may believe that the diamond has decreased in value.
Highest quality diamonds per se won't lose value, unless one is sold in a distress situation, in which case, the price may be less than originally paid because the seller simply 'needs the cash'.
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Whatever you have to sell is worth whatever someone will pay you for it. The uncut diamonds could be industrial diamonds or gemstone-quality diamonds. Eighty percent of all diamonds mined are industrial diamonds, which you can purchase very cheaply. Take your uncut diamonds to a diamond cutter for an in-person conversation about the value of each or of the cache.
% change is the % of increase or % of decrease. % change = (difference of the two values / the original value) x 100% =[(original value - new value)/original value] x 100% % increase -if the value increased % decrease -if the value decreased
By weight, diamonds are worth more because they are much more rare than gold.
A diamond is valued by its cut, clarity, carat weight and colour.
work out the difference between the new value and the original value. divide this value by the original value multiply this value by 100 to give you the percentage