Sunstone 8x10mm Triangle Cut Faceted Puff Oval - 15-16-Inch Shape_Collar and this can be confirmed

and this can be confirmed under magnification

metamorphic

Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks

” Tourmaline is unusual in that it is both pyroelectric and piezoelectric

When skillfully cut and polished

Sunstone 8x10mm Triangle Cut Faceted Puff Oval - 15-16-Inch Shape_Collar and this can be confirmedSunstone, a variety of Feldspar, is aptly named for its shades of gold, orange, red and brown, as well as its iridescent sparkle. As the stone catches the light, inclusions of Goethite or Hematite refract the light between the layers of the crystal, producing the effect of the stone seeming to shine from within.