The study is devoted to the boulder resources in Latvia, they have been evaluated and the limits of the practical use have been shown. Therefore the aim of the study was to identify other values and feasible use of the boulders in accordance with the nature protection restrictions. Such values are recognized by identifying the significant cultural and historical values of the boulders. A comparative study conducted in the Buļļumuiža ancient burial cairns in Limbaži region. In the studied archaeological site were made herein used stone material assessments - stones were photo documented and measured using non-destructive methods of research. The study provides omens that allow to estimate the stone material use in the prehistoric times and among them specifically addresses to the symmetric shapes allocated to the stones. It is pointed out that symmetric properties regarding to the stones indicate human activity by choosing stones and giving them shapes as well as placing them in the ancient buildings. In detail have been analysed two widely distributed morphological forms of the boulders that visually resemble loaves and drops giving their characteristic values and the analysis of their symmetry indicators. It is noted that in the studied burial places there have been recognized also some other artificially given stone shapes, but for their analysis is currently insufficient data available. More widely dealt with symmetry evaluation ways and technique, which are leading to the conclusion about their extensive possibilities regarding to ancient cultural objects identification. The simplified method have been developed to determine the type of the symmetry group of the boulders what in study is distinguish as a leading indicator to determine boulders as ancient treated stones.