Exam (elaborations)
Diamond & Diamond Grading Exam/469 Complete Q’s and A’s
- Course
- Institution
Diamond & Diamond Grading Exam/469 Complete Q’s and A’s
[Show more]
Content preview
Diamond & Diamond Grading Exam/469Complete Q’s and A’s
Abrasion (Abr) - -A series of minute nicks along the facet junctions of a
fashioned diamond; gives the edges a white or fuzzy appearance.
(Assignment 10)
-Adamantine luster - -The highest degree of luster possible in a transparent
material. (Assignment 8)
-Aggregate - -A solid mass of individual, randomly oriented crystals,
intergrown or held together by a natural binding agent. (Assignment 7)
-Alluvial deposit - -A deposit where gems are eroded from their source rock,
then transported away from the source and further concentrated.
(Assignment 5)
-Angle of incidence - -The angle at which a ray of light strikes a surface,
measured from the normal. (Assignment 8)
-Angle of reflection - -The angle between the normal and a reflected ray of
light. (Assignment 8)
-Annealing - -Using heat to stabilize irradiated color in gemstones.
(Assignment 12)
-Appraisal - -An estimation of the value of an article, usually for insurance
purposes. (Assignment 1)
-Average girdle diameter - -The result achieved by adding the smallest and
largest girdle measurements of a round brilliant and dividing by two.
(Assignment 14)
-Bast - -Frosted rough diamond. "Bark" in Dutch. (Assignment 9)
-Bearded Girdle (BG) - -Very small feathers that extend from the girdle
surface into the stone; can result from the cutting process. (Assignment 10)
-Belly - -The slightly curving center of the long side of a pear, marquise,
heart, or oval. (Assignment 16)
, -Beneficiation - -A commitment to reserve a portion of the resources
derived from any country for the economic development of that country.
(Assignment 3)
-Best Practices Principles (BPP) - -De Beers' formalized commitment of itself
and its sightholders to the highest ethical standards. (Assignment 3)
-Blemish - -Clarity characteristic that's confined to the surface of a polished
gemstone. (Assignment 10)
-Block caving - -Underground mining that involves building a concrete-lined
tunnel under an ore deposit, then collecting the ore through openings in the
liner. (Assignment 6)
-Blocking - -Placing the first 17 or 18 facets on a diamond. (Assignment 9)
-Bow-tie - -A dark area across the center of an elongated brilliant cut.
(Assignment 16)
-Brick-and-mortar retailer - -A traditional store consisting of walls and a
fixed location. (Assignment 3)
-Brightness - -The effect of all the diamond's internal and external
reflections of white light. (Assignment 8)
-Brilliant cut - -A cutting style in which triangular and kite-shaped facets
radiate from a gem's center toward its girdle. (Assignment 16)
-Brillianteering - -Placement and polishing of the star and upper and lower
girdle facets. (Assignment 9)
-Bruise (Br) - -A tiny area of impact accompanied by very small, root-like
feathers visible at 10X magnification; typically occurs at a facet junction.
(Assignment 10)
-Bruting - -Forming the basic face-up outline of a diamond to prepare it for
faceting. (Assignment 9)
-Bulk sampling - -Large-scale character sampling. (Assignment 5)
-Burn Marks (Brn) - -Hazy surface areas that result from excessive heat or
from uneven polishing caused by structural irregularities; also called polish
marks or burned facets. (Assignment 10)
-Cavity (Cv) - -An angular opening created when part of a feather breaks
away. (Assignment 10)
, -Central Selling Organisation (CSO) - -An agency designed to purchase, sort,
evaluate, and sell rough diamonds. (Assignment 2)
-Character sampling - -Testing for the size, shape, clarity, and color of the
diamonds in a deposit. (Assignment 5)
-Characteristic color - -The basic color of a fancy-colored diamond.
(Assignment 13)
-Chemical vapor deposition (CVD) - -An industrial process adapted to allow
growth of synthetic diamond from carbon-rich gas in thin layers onto a silicon
or diamond surface. (Assignment 19)
-Chip (Ch) - -A shallow opening caused by damage to the stone's surface;
typically occurs at a girdle edge, facet junction, or culet. (Assignment 10)
-Clarity characteristic - -Internal or external feature of a gemstone that
helps determine its quality and establish its identity. (Assignment 10)
-Cleavage (Cl) - -Large, severe, straight break along a plane of atomic
weakness; considered an inclusion. (Assignment 10)
-Cleavage plane - -Plane parallel to a possible crystal face, where a
diamond can split cleanly when struck. (Assignment 7)
-Cleaver - -A person who cleaves, or splits, a diamond along a cleavage
plane. The cleaver might also be responsible for planning the fashioning of a
polished gem. (Assignment 9)
-Cleaving - -Dividing a diamond into two or more pieces along a cleavage
plane. (Assignment 9)
-Cloud (Cld) - -Many tightly grouped pinpoints that might be too small to
distinguish individually at 10X but together have a hazy appearance.
(Assignment 10)
-Color center - -Structural defect that influences an object's absorption of
light and can cause its color. (Assignment 12)
-Conflict diamonds - -Diamonds used to finance violence and terror.
(Assignment 3)
-Consignment - -A selection of goods loaned to a dealer by another
wholesaler or manufacturer. (Assignment 20)
, -Core - -Earth's innermost layer. (Assignment 4)
-Covalent bond - -A chemical bond formed by two atoms sharing electrons.
(Assignment 7)
-Craftsmanship - -The care that goes into the fashioning of a polished
diamond, as confirmed by its finish. (Assignment 15)
-Cratons - -Ancient, large, and stable parts of the earth's continental crust.
(Assignment 4)
-Critical angle - -Angle between the normal and the maximum angle of
refraction, which is the largest angle at which rays inside the diamond can
escape. (Assignment 8)
-Cross worker - -A person who performs the cross-working operations during
diamond polishing; sometimes called a cross cutter. (Assignment 9)
-Cross working - -Placing the bezel and pavilion facets on round and fancy
shapes. Sometimes combined with blocking, especially on smaller stones.
Also called cross cutting. (Assignment 9)
-Crown angle - -The angle formed by the bezel facets and the girdle plane.
(Assignment 14)
-Crown height percentage - -The distance from the girdle plane to the table,
expressed as a percentage of average girdle diameter. (Assignment 14)
-Crust - -The surface and outermost layer of the earth. (Assignment 4)
-Crystal - -Solid matter with atoms arranged in a regular, repeating pattern.
(Assignment 7)
-Crystal (Xtl) - -A mineral crystal contained in a diamond. (Assignment 10)
-Crystal planes - -Internal directions parallel to a mineral's unit cell surfaces.
(Assignment 7)
-Crystal shape (form) - -Geometric shape of a well-formed crystal.
(Assignment 7)
-Crystal structure (lattice) - -Regular, repeating arrangement of atoms in a
mineral. (Assignment 7)
-Crystal systems - -Categories of crystals based on their symmetry and
internal structure. (Assignment 7)
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Nursephil2023. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $16.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
81633 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now