These agate nodules have been cut, polished and then dyed to accentuate the natural patterns within. Volcanic lava bubbles cool and slowly fill with crystalline bands to produce this effect. We only choose the highest quality Brazilian agate for our range. Each nodule measures approximately 3-4”. Home décor, agate, stone, geode, natural, polished, gift, stocking stuffer, holidays, Christmas, home, office, living, thanksgiving, valentines, mothers day, fathers day, gift, present, mineral, bestseller.