The value of something is determined by what it is worth to an individual. This could be based on different factors such as its rarity, its usefulness, its demand, its condition, or its sentimental value. Ultimately, the value of something is subjective and will depend on the individual's opinion. For example, a diamond ring may be valuable to one individual because of its sentimental value, while it may be of little value to another individual due to its lack of practicality. Therefore, the value of something will vary depending on the individual.