Two geological stones consistent with water-worn river rocks

This pair of stone specimens is displayed in a hand for scale, appearing to be roughly 2 to 3 inches in length each. The upper stone exhibits a light beige/tan coloration with a matte, somewhat pitted or grainy surface texture, which may be consistent with limestone or a similar sedimentary rock. It has an irregular, somewhat wedge-like shape with rounded edges. The lower stone is a darker olive-brown color with a smoother, denser appearance, potentially consistent with quartzite or a fine-grained silty stone. This second stone features a subtle diagonal banding or vein across its surface. Both items show significant rounding on all edges, which is stylistically consistent with natural erosion from water movement (fluvial action), commonly seen in river-worn pebbles. There are no visible maker's marks, inscriptions, or artificial modifications readable in the image. The surfaces show minor scuffs and natural variations in mineralization. Without professional petrographic analysis or physical testing for hardness and porosity, a definitive geological identification cannot be made. No archaeological context is provided, so they are categorized based on their apparent natural physical state.

I have examined the provided image of two geological specimens. Based on what I can see, these items represent common water-worn stones, possibly sedimentary and metamorphic in origin. The upper specimen shows a matte, light-tan surface consistent with limestone, while the lower stone displays a denser, darker appearance suggestive of quartzite or silty stone with a subtle vein. I cannot verify the specific mineral composition or internal density from a photo, as this would require physical testing for hardness, porosity, or petrographic analysis. The value estimate is based on the assumption that these are natural, non-precious river pebbles found globally. Such items currently hold minimal market demand and are typically sold as decorative garden accents, aquarium stones, or educational samples rather than high-value collectibles. Because no rare mineral inclusions or significant archaeological context (such as use as prehistoric tools) are visible or documented, the valuation remains nominal. A physical inspection would be required to rule out any rare mineral variants or fossiliferous properties that might slightly increase their interest to a collector. If these stones were found to have a specific historical provenance or were determined to be rare semi-precious minerals through scientific testing, the value could increase slightly; however, in their current state as natural curiosities, they are appraised according to the general market for similar unworked geological found objects. Without provenance or unique mineralogical features, these specimens function as aesthetically pleasing natural objects of low financial value.