Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prĕtĭōsĭtas, ātis, f. [pretiosus], preciousness, costliness (very rare): anuli pretiositas, Atei. Capito ap. Macr. S. 7, 13; App. M. 2, p. 123, 4.