and cognitive function

warm to the touch

smooth enough to hold without thinking about it

Amethyst is violet quartz colored by trace iron and natural irradiation

Watermelon Tourmaline Faceted Sterling Silver Earrings Oval and cognitive functionPink at the center, green at the rimthe color zoning visible through the facets like a cross section of fruit. Watermelon tourmaline is a color zoned elbaite tourmaline in which the core of the crystal grows pink or red (from manganese) while the outer zone grows green (from iron), producing the characteristic concentric color pattern. This zoning develops as trace element concentrations shift in the surrounding pegmatitic fluid during crystal growth.