Gemologists, and more astutely, certified gemologists.
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Diamonds are VALUABLE
No, people say ROTATED SQUARES are diamonds - It's a common mistake. Diamonds are just rotated squares - NOT diamonds. Just remember that.
Because all the people in the grade are 9, 10, and 11.
There is only one type of diamond, a diamond. Diamond is a stone that can be cut into many different shapes, based on its size and the characteristics it possesses.Another AnswerAccording to Wikipedia's Diamond entry, seven occurrences of the word 'type' appear in that entry:Types of impurities -- which determines the colour of a diamondTypes and concentrations of nitrogen -- again colourType of diamond called Carbonado -- a black diamondImpact-type microdiamonds -- indicators of ancient impact cratersTypes of volcanic pipes near which diamonds are sometimes found -- kimberlite or lamproiteGem-grade diamonds or industrial-grade diamonds -- two types of diamondsSynthetic or natural, irradiated or non-irradiated, each a type of diamond.Finally, there are scientific classes of diamonds which include:Type I -- nitrogen at a concentration of 0.1%Type Ia -- 98% of gem-quality stones, a mixture of Type IaA and IaB. Type IaA -- nitrogen atoms in pairs, which do not affect the diamond's colourType IaB -- large, even-numbered aggregates of nitrogen, imparting a yellow to brown tintType Ib -- rare canary diamonds, only 0.1% of known natural diamonds. Also synthetic diamond containing nitrogenType II - have no measurable nitrogen impuritiesType IIa can be coloured pink, red or brown based on structural anomalitiesType IIb diamonds -- are usually light blue due to boron impurities -- 0.1% of gem diamonds.
There are numerous 'kinds' of diamonds -- too many to list. The number of diamonds cannot be determined, since not all diamonds have been mined to date.