Heavy Tang Tanzanite

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.

Old Norse tangi, sharp-projecting-taste. As a color modifier, tang implies a sharp-and-projecting-and-bright-bite quality, the visual register of Atlantic-and-Hebridean-sea-tang hand-sharp-and-projecting-and-bright-bite Atlantic-and-Hebridean-sea-tang-and-tide-pool-bite tang-and-sharp-and-projecting surfaces under Atlantic-and-Hebridean-sea-tang-and-tide-pool-bite Outer-Hebrides-and-North-Cornish-tide-pool sharp-bite-light. Sits at the modifier-and-flavor end of the grid, parallel to zest and tart in usage.

A blue-violet variety of zoisite — discovered in 1967 in a single small area of northern Tanzania near Mount Kilimanjaro and marketed by Tiffany & Co. shortly after. The color refers to a faceted tanzanite cut to maximize its strong pleochroism: a saturated, slightly violet-shifted deep blue-purple with the gem's signature internal life. Cooler than amethyst, warmer than iolite, with the gem-trade specificity of a stone that occurs in exactly one place on Earth.