All of the four diamond 'C' characteristics play role in determining the stone's worth: Carat Colour Clarity Cut General Rules...All Things Being Equal  The larger the stone, the greater its value.  The more colourless a stone is, the greater its value (this excludes fancy coloured stones)  The fewer the inclusions, the greater a diamond's value.  The better the cut of the stone, the greater its value. To view how carat, colour, clarity and cut play a role in determining a diamond's worth, please visit the online ordering section of this site and search our inventory of stones according to your criteria.