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.20CTW MM VARIES ROUND SHAPED IRRADIATED BLUE DIAMONDThe name 'diamond' comes from the Greek word 'adamas' which means 'the unconquerable.' It was given this name because it's the hardest gemstones with a cutting resistance 140 times greater than ruby and sapphire which are the next hardest in the Moh's scale. At times irradiation treatment is used to enhance the color of diamonds.