Gemological Terms, Tools & Properties
Gemological terms comprise the language gemologists and others use to discuss gemstones. Gemological tools are the instruments gemologists use to examine and identify gem materials. Gemological properties are essential or distinctive attributes or qualities found in gemstones that can help determine their identity and describe their beauty. To delve further into gemology’s engrossing world, choose from the Gemological Terms, Tools, & Properties pictorial glossary below.
Vignettes
Enhancement, when used in gemological conversation, stands for a man-induced treatment that improves the appearance or durability of a gemstone. Gem minerals are rare, durable, and beautiful by definition; this...
Agates have long been attributed with the ability to aid in love, wealth, good luck, longevity, courage, protection and healing, balance, harmony, generosity, strength, security, and the appreciation of nature....
Terms & Definitions
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Adamantine is the term used to describe the luster exhibited by diamonds and gems with a Refractive Index of 1.9 – 2.5. The root word adamant derives from the Greek word adamastos which means untameable. Throughout history the...
Adularescence is an optical phenomena often called the “moonstone” effect. The phenomenon is applied to feldspar, usually orthoclase that, when cut as a cabochon, exhibits a floating, billowy bluish or...
Alexandrite-like refers to the ability of a gem material to change colors when viewed under different light sources such as daylight and incandescent lighting. It is named after the natural “change of...
The term allochromatic is used in reference to gem materials that derive their color from elements that are not an essential part of their chemical composition. In other words, the...
Aqua Regia translates from Latin as “royal water.” It is a combination of hydrochloric acid and nitric acids that dissolve gold and platinum. Mixed in different concentrations, these acids can be used to...
Aventurescence is a phenomenon in gemstones whereby glittering reflections of small inclusions of hematite or goethite in feldspar or fuchsite or hematite in quartz, sparkle and shimmer.
Avoirdupois is a measurement of weight for items other than jewelry and precious metals. Abbreviation: oz 16 oz avoirdupois to 1 lb Avoirdupois Abbreviation: lb 7000 Troy Grains to 1 lb Avoirdupois