Know your diamonds!

Gemology or Diamondology
Speak the diamond cutters jargon
Blemish: It is a flaw on the outside of a diamond. It could be from a scratch, cut, or chip.
Blue-White: Some diamonds glows under a fluorescent blue light.
Brilliance: It’s the white light reflected from a diamond.
Brilliant: It’s term used to describe a round diamond consisting 58 facets.
Carat: One unit of weight is the equivalent to 200 milligrams.
Carbon: Diamonds are made from carbon. Sometimes you may get a flawed diamond with tiny black spots.
Cloud: Sometimes there are tiny cluster, within a diamond.
Crown: Refers to the top of a diamond.
Culet: The bottom of an uncut diamond.
Dispersion: Can be called fire. May describe any colored light entering the diamond.
Eye Clean: Some diamond doesn’t show any flaws on the surface.
Facet: Describes the cut and polished diamond. A full-cut diamond always has 58 facets.
Full Cut: A diamond with 58 facets.
Gemologist: A highly trained person skilled in grading precious stones.
They can also issue certificates on diamond jewelry.
Girdle: Describes the narrow, unpolished band around the widest part of the diamond. The girdle separates the crown from the pavilion uncut stone.
Inclusion: It’s a term to describe carbon spots or fractures inside the raw stone.
Carat: Measurement of the purity of gold; 24-karat being pure gold. Jewelry is made from 18K and 14K gold.
Laser-Drill: Diamonds can be treated with a laser to clean carbon spots.
Lou: A magnifying glass to view gemstones
Off-Make: Poorly proportioned diamond.
Pave: A unique way of clustering diamonds close together.
Point: A diamond weighing one-and-a-half carats must weigh 150 points.
Single-Cut: Diamonds that have only 16 or 17 facets.
Sparkle: The intensity of light reflecting from the diamond. It could also be called dispersion.

Why won't the counter viewpoint push my apparent sketch?