Corundum is the lovely mineral that makes up sapphires which come in many colors and varieties. Except red, my dears, the red variety is ruby!
Now, as one can see, the typical blue sapphire can also have some variations and with “silk” of mineral rutiles, it becomes a star sapphire which has its own beauty. The center photo is of the famous Star of Asia and has an especially exact star to display.
Pair of paintings on silk in mineral pigments, gofun or powdered clam shell, and sumi ink mounted as byobu or folding screens in two panels, depicting a late spring scene of flowering yamabuki or yellow mountain rose (Kerria japonica). By Maruoka Hiroshi (1892 – 1966). Showa 11 or 1936.