Definition: Semi-Precious is a class of natural stone, one mined from the earth, that are not classed as a gemstone. Included in the semi-precious category are stones such as garnets, aquamarine, citrine, apatite, and other mineral stones. However, even diamonds, emeralds, rubies, and sapphires can be sold as semi-precious grade, and are often available as small beads sold in single, graduated-size strands, with the largest bead being approximately 6mm, down to a 3mm or 4mm size. In most cases the definition of semi-precious has more to do with the quality of the stone, and less to do with the composition of the mineral that makes up the stone.
Semi-precious stones are often treated using a variety of methods for coloration and stabilization. Almost all turquoise has been treated with a transparent resin in order to stabilize it, as it is a fragile stone in an untreated state. Many other stones are either heat-treated or irradiated to enhance their colors.
Pronunciation: sim ee presh ush
Also Known As: gem mineral, stones, non-gem grade stones
Alternate Spellings: Semiprecious
Examples: The necklace was made up of a scintillating combination of colored semi-precious stones, giving it the look of a necklace fit for a Queen.
