A natural ruby corundum rough crystal measuring 13.9x11.4mm and weighing 15.5 carats, presented in its unprocessed mineral state. The exterior surface has the rusty brownish-orange iron oxide coating typical of Madagascar ruby rough, and the opaque body reveals the corundum's characteristic red color in patches across the natural crystal faces. The somewhat flat, plate-like form makes this piece easy to display or handle, with the natural surface giving a good sense of the mineral's raw character. Madagascar is the world's primary commercial source of natural ruby, and individual opaque crystals of this weight are well suited for mineral specimen collections, lapidary raw material, and natural gemstone display. The piece is entirely untreated - no heat or any other enhancement - as it came from the deposit. UV fluorescence typical of Malagasy ruby corundum is present. Large opaque ruby rough at this size is an accessible entry point for collectors interested in natural mineral specimens rather than cut stones. Stone type: Natural Ruby Weight: 15.5ct Size: 13.9x11.4mm Color: Red Cut: Rough crystal Clarity: Opaque Treatment: Untreated Origin: Madagascar Hardness: 9 Natural ruby corundum, July birthstone - sold loose.
