You are right
Ame, never down, only up and up. Per this article,
http://www.miningweekly.com/print-version/rbc-says-strong-price-rises-ahead-for-diamonds-2011-05-26
What this means, we believe, is that diamond prices are likely to increase at rates greater than the recent past as no material new production is coming on stream, analysts Des Kilalea andPatrick Morton said in the report.
Based on trend analysis from De Beers, if current trends continue, China and India together are forecasted to account for 50% of incremental demand or growth in the world diamond markets over the next five years,
According to another article written in March 2011, that Harry Winston reported record sales for the quarter ended January 31, which rose 61%.