How much 5 carat diamond cluster worth?

When you use the Word 'cluster' to describe total carat weight of diamonds, this means that there are several diamonds involved.

Every diamond is valued by its cut, colour, clarity and carat weight. Individually, the diamonds, then, have value. You can take your jewelery to a certified gemologist, who will document each diamond and give you an idea of the fair market value of each.

A cluster of diamonds weighing a total of five carats will be worth less than a single stone of the same weight.