The gem-tree form is a long-standing decorative tradition in lapidary craft

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it carries the full crystal structure of quartz (silicon dioxide

Black Tourmaline is a boron silicate mineral in the schorl variety

Labradorite Half-Polished Form Size:5"x0.5"x2.75" The gem-tree form is aThe raw face holds the stone's outer character; turn it and the polished face eruptsblue, green, gold, shifting as the angle changes. Labradorite is a plagioclase feldspar, chemically a calcium sodium aluminum silicate, Mohs 6 to 6. 5. Its signature optical phenomenonlabradorescencecomes from light interference between thin, repeatedly twinned crystal layers within the stone. The effect is structural, not pigment based: no color is chemically present,