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Here you can learn about color , clarity , and intensity ( almost like shopping for diamonds ! A pebble surrounded by diamonds remains a common stone , and a diamond surrounded by pebbles is still a gem . An expected leveling off in diamond mining production overshadow long-term prospects . These include the recommendations that the envisaged scheme should be effective and pragmatic , should be consistent with international law , should not impede the current legitimate trade in diamonds , should be based primarily on national certification schemes , and should secure the widest possible participation . His main field of interest is crystals , everything from diamonds to semiconductors , and how materials condense into solid structures .