human
I've heard that the more expensive the diamond, the more likely it is to be fake. Is this true?
assistant
Yes, this is true. The higher a diamond's quality grade, the more expensive it will typically be. A diamond's quality grade is determined by its color, clarity, and cut. Colorless diamonds are generally considered the highest quality, followed by D-color diamonds, then E-color diamonds, etc. Clarity refers to the absence of visible inclusions in the diamond, while cut refers to how well the facets of the diamond are aligned. The better these factors are, the more valuable the diamond becomes.