Yellow Calcite 10mm Round A Grade - 15-16 Inch bicone_beads It sometimes features dark brown

It sometimes features dark brown to black dendritic inclusions that branch like tiny tree limbs through the stone

Ruby and Sapphire

Crazy Lace Agate is often dyed to produce colors that do not naturally occur in the stone

are more special than most

Many stones in the Russian crown jewels from the 17th century which were thought to be rubies are actually red Tourmaline

Yellow Calcite 10mm Round A Grade - 15-16 Inch bicone_beads It sometimes features dark brownCalcite is a rock forming mineral that is extremely common and found throughout the world in sedimentary, metamorphic, and igneous rocks. Calcite is the principal constituent of limestone and marble. These rocks are extremely common and make up a significant portion of Earth's crust.