Mohs 5—its vivid blue coloration is relatively rare within the apatite group and is prized for that reason

converting the iron-based color center responsible for purple into one that produces pale green

Rose quartz is the pink massive variety of quartz

they will often appear bright orange

Watermelon Tourmaline Faceted Sterling Silver Earrings Oval Mohs 5—its vivid blue colorationPink 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.