When buying a diamond, consider the "4 Cs" to judge its quality & cost: color, clarity, cut & this weight
[DOC] [TLE] Diamond Appraisals: The 4 C's - Color, Clarity, Cut & Carat Weight [PAR] div >< a href = "http://gemguide.com/learning/education-diamonds/4-cs/" > ... for 
consumers and the trade to judge quality, and hence, value when buying or 
selling.