Heavy Median Sapphire

Old English hefig, weighty — cognate with heave. Used as a color modifier since at least the seventeenth century to indicate weight in saturation as much as value: heavy with pigment, heavy-bodied. In the engine's adjective grid, heavy sits alongside deep and plush in the dark-and-saturated quadrant. Closer to a fabric description than a pure value word.

Latin Medi, Medes. As a color modifier, median implies an ancient-Iranian-and-Median-Empire quality, the visual register of Median-Empire-of-Ecbatana pre-Achaemenid Iranian-Median highland-kingdom hand-built fortress-and-temple surfaces under Median-Empire-of-Ecbatana pre-Achaemenid Iranian-Highland fortress light. Sits at the modifier-and-cultural end of the grid, parallel to persia and achaemenid in usage.

An iron-and-titanium-bearing corundum — the same mineral as ruby, hardness 9 on the Mohs scale, mined for two millennia from Sri Lanka, Burma, Madagascar, and the Cashmere mines of British India. The color refers to a fine Kashmir-cut sapphire: a saturated, slightly violet-shifted deep blue with the gem's signature internal velvet — a quality of light scattering in the stone that faceted glass cannot replicate. Cooler than cobalt, deeper than azure.