Semi-precious stones are hard gemstones that are created organically. They can be sourced from various places including lava or oceanic hotspots, mines, and shells. Types of semi-precious stones include agate, opal, amethyst, pearl, and quartz. Semi-precious stones offer a variety of colors and aesthetics that can be applied to countertops, floor and wall tiles, facades, fireplace surrounds, stairs, elevators, backsplashes, and wet walls.
There is no real differentiation between the stones that are classified as precious and semi-precious. This categorization was determined in the 1800s based off of the revenue generated from the stones. All gemstones have grades or qualities that make them desirable, beautiful, and rare.