Dioptase with Calcite Gemstone Carvings Each strand measures 15 inches

Each strand measures 15 inches in length

The very first stone tools were not created by humans

the distinctive pattern of the six-sided coral fossil emerges

commonly schist

Within the "Gemstone community" Zircon is not a commonly used stone

Dioptase with Calcite Gemstone Carvings Each strand measures 15 inchesDioptase crystals are emerald green and translucent. The mineral got its name from the Greek words for "to see" and "through" because of the ability to see internal cleavage planes of the small crystals. The mineral forms in rhombohedral crystals (usually less than 1cm in size) with a chemical composition of CuSiO3 (H2O).