Heavy Mossed 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 English mos, moss. As a color modifier, mossed implies a moss-covered-and-aged quality, the visual register of English-and-Welsh-mossed-and-lichen-covered moss-and-lichen-covered stone-and-tree-and-cobble mossed-and-lichen-covered surfaces under English-and-Welsh moss-and-lichen-covered atmospheric light. Sits at the modifier-and-texture end of the grid, parallel to pitted and limed 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.