Diamonds are water - repellent, and they stuck to the grease while the unwanted material was washed away. At this stage the diamonds were rough.
हीरे जल प्रतिरोधी होते हैं, और वे चिकनाई के साथ चिपक जाते, जबकि अनचाहा पदार्थ धुल जाता था ।