Gems & gemology pdf


It is considered a geoscience and a branch of mineralogy. Some gems & gemology pdf are academically trained gemologists and are qualified to identify and evaluate gems.

Recently, the demand for gemological services has grown, as increasing quantities of synthetic gems such as cubic zirconia and synthetic moissanite are manufactured. Gemologists perform such work as the identification of synthetic and natural gemstones, fracture-filled gemstones, and color-enhanced or treated natural gemstones. A gemstone is a mineral, rock, or petrified material that when cut or faceted and polished is collectable or can be used in jewelry. Gemstones are basically categorized by their crystal structure, specific gravity, refractive index, other optical properties, and hardness.

The word jewellery is derived from the word jewel, which was anglicised from the Old French “jouel” in around the 13th century. Further tracing leads back to the Latin word “jocale”, meaning plaything.

100,000 year-old Nassarius shells that were made into beads are thought to be the oldest known jewellery. Jewellery is made out of almost every material known and has been made to adorn nearly every body part, from hairpins to toe rings and many more types of jewellery.

While high-quality and artistic pieces are made with gemstones and precious metals, less-costly costume jewelry is made from less-valuable materials and is mass-produced. Diamond is the hardest natural material known to man and the third-hardest known material after aggregated diamond nanorods and ultrahard fullerite.

Its hardness and high dispersion of light make it useful for industrial applications and jewelry. About 100,000 kg are synthesized annually.

They have been treasured as gemstones since their use as religious icons in ancient India and usage in engraving tools also dates to early human history. Popularity of diamonds has risen since the 19th century because of increased supply, improved cutting and polishing techniques, growth in the world economy, and innovative and successful advertising campaigns. Mourning jewellery: Onyx Brooch, 19th century. This page was last edited on 11 October 2016, at 06:04.

By using this site, you agree to the Terms of Use and Privacy Policy. Please forward this error screen to sharedip-1601533298. Review of Secrets of the Gem Trade, Second Edition by Richard W.

Retail jewelry and watch sales ahead of 2016, but wages still lag and limit disposable income. A report on the September show, including the Argyle tender, synthetic diamonds and colored gems. Located on GIA’s Carlsbad campus, The Richard T. Liddicoat Gemological Library and Information Center is the largest, most complete library of its kind.