These are 1+ carats calibrated 2.5mm carat black round rose cut polished diamonds. Like almost all black diamonds, these diamonds have been heated. Each lot contains at least 13 stones. All our diamonds comply with UN Kimberley regulations. 2.5mm (2.3mm-2.7mm). Or by clicking on our store link! The item “1+ Carats 2.5mm BLACK Rough ROSE CUT POLISHED DIAMONDS” is in sale since Wednesday, June 10, 2009. This item is in the category “Jewelry & Watches\Loose Diamonds & Gemstones\Loose Diamonds\Rough Natural Diamonds”. The seller is “ruffdiastuff” and is located in New York, New York. This item can be shipped worldwide.