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Gem Encyclopedia is a virtual journey through the science and lore of Gemstones from across the globe. Each Gem page features Gemological Information, a Buyer’s guide, photos, videos & research.
- English
Iolite is the gemstone for the twenty-first wedding...
- Topaz
Why We Love This Gemstone. 1 Kilos. Topaz comes in some of...
- Turquoise
Why We Love This Gemstone. 1 Spiderweb. The spiderweb of...
- Alexandrite
Why We Love This Gemstone. 1 Color Change. Making...
- Tanzanite
Why We Love This Gemstone. 1 Pleochroic. Tanzanite is...
- Gem Encyclopaedia
Gem Encyclopedia is a virtual journey through the science...
- English
A comprehensive glossary of terms used to describe colored stones, precious and semi-precious gems, minerals and gemstone jewelry. Gemstone and Jewelry Inf...
- Alignment
- Analog vs Digital Angle Scales
- Axis
- Boule
- Brilliance
- Cam and Clam
- Carat
- Carat Scale
- Cheating
- Cleavage and Fracture
Positioning the stone so that the crown break facetsmatch up with the pavilion break facets at the girdle after transferring the stone.
Some newer faceting machines have digital angle scales that allow users to adjust the quill to a 100th of a degree, which corresponds with modern gem designs produced in typical GemCadformat. The average machine has a protractor or analog angle dial which reads to 1 degree, with a vernier scale which allows further adjustment to a 10th of a degree.
This can refer to one of the following: 1. The direction of crystal growth in gem material, such as the A-axis or width, the B-axis or depth and the C-axis or length. In some tourmalines, the C-axis may be blocked, also referred to as "closed,"which prevents light from passing through it. 2. In a symmetrically cut stone, the axis refers to an imagi...
A cylindrical or carrot-shaped synthetic gem formed as the result of a flame fusion process, such as synthetic corundum and spinel. In the case of most synthetic corundum, manufacturers split the boule down the middle, lengthwise, to relieve internal stresses that result from the creation process. These split pieces are referred to as split boules.
A term that refers to the total amount of light return that results from internal and external light reflection. Factors that affect brilliance include the gem's refractive index, design proportions, polish, and the clarityof the material.
Pre-form methods. CAM (Center Point Angle Method) involves cutting 3 or 4 temporary pavilion facets to establish the culet of the stone, then cutting the same number of corresponding girdle facets to establish a basic pre-form. CLAM (Corner Locator Angle Method) involves cutting two pavilion facets that make a line from the culet to the corner of t...
A unit of weight for gems, equal to 200 milligrams or 1/5 of a gram. Don't confuse carat with karat, a measure of the purity of gold, or carrot, an orange root vegetable.
An instrument used to measure the weight of a cut stone in carats. Some digital carat scalescan also weigh in grams, pennyweight, ounces, troy ounces, and drams.
A colloquial term that refers to the common technique for finessing a facet to meet where you want it. It doesn't denote an inappropriate action. Faceters most often "cheat"after cutting and polishing the table to make sure all the facets that should be touching the table are doing so. It involves re-cutting or re-polishing a facet at a slightly di...
Terms that refer to the way a stone breaks. If the stone breaks along a certain flat plane, this surface is called the cleavage plane. If the stone breaks along an uneven or irregular surface, this is called a fracture.
Navigating the World of Gemstones: A Glossary. Welcome to IceMoissanite’s glossary – your go-to guide for the fascinating world of precious gems. Dive into the details of gemstone cuts, uncovering the magic behind brilliance, symmetry, and dispersion.
Gemology glossary. Abalone pearls. colored baroque pearls produced by an edible univalue mollusk which has an ear-shaped shell prized for its multicolored mother-of-pearl lining. These are found in America, New Zealand and Japanese waters. Seldom spheroid, they are usually flattened and ear or tooth- shaped. Absorb.
27 de feb. de 2020 · Are you new to jewelry or just beginning to explore the science behind the stones? Here's a list of gemstone terms you may not know the meaning for.
30 de may. de 2009 · allochromatic: a gemstone is allochromatic when it is colorless in its pure state. Subsequent color is derived from an impurity (usually a metallic oxide) that is not an essential part of the mineral's chemical composition. Beryl, quartz and corundum are all examples of allochromatic gemstones.
