1. A computer-based method for appraising valuable items, the method comprising: receiving, from a first network computer, a description of a first valuable item, the description of the first valuable item including one or more required descriptive elements and one or more non-required descriptive elements; determining, using one or more processors, that the description of the first valuable item is missing a required descriptive element; in response to the determination that the description of the first valuable item is missing the required descriptive element; setting an appraisal quality flag to red, sending a request to the first network computer to provide the missing required descriptive element, receiving, from the first network computer, the missing required descriptive element, setting, in response to the reception of the missing required descriptive element, the appraisal quality flag to green, retrieving a first set of item values associated with the first valuable item, determining, using the one or more processors and based on the description of the first valuable item and the first set of item values, an appraisal value for the first valuable item, and forwarding the appraisal value for the first valuable item and the green appraisal quality flag; receiving, from a second network computer, a description of a second valuable item, the description of the second valuable item including one or more required descriptive elements and one or more non-required descriptive elements; determining, using the one or more processors, that the description of the second valuable item is missing a non-required descriptive element; in response to the determination that the description of the second valuable item is missing the non-required descriptive element; determining, using the one or more processors, a default value for the missing non-required descriptive element, determining, using the one or more processors, that the missing non-required descriptive element is not critical, setting, in response to the determination that the missing non-required element is not critical, the appraisal quality flag to yellow, and forwarding the yellow appraisal quality flag; receiving, from a third network computer, a description of a third valuable item, the description of the third valuable item including one or more required descriptive elements and one or more non-required descriptive elements; determining, using the one or more processors, that the description of the third valuable item is missing a non-required descriptive element; and in response to the determination that the description of the third valuable item is missing the non-required descriptive element: determining, using the one or more processors, a default value for the missing non-required descriptive element, determining, using the one or more processors, that the missing non-required descriptive element is not significant, setting, in response to the determination that the missing non-required element is not significant, the appraisal quality flag to green, retrieving a second set of item values associated with the third valuable item, determining, using the one or more processors and based on the description of the third valuable item and the second set of item values, an appraisal value for the third valuable item, and forwarding the appraisal value for the third valuable item and the green appraisal quality flag.