Education

The Critical Angle 5.08

The Critical Angle (5.08)The third aspect of light travel in a diamond deals with the internal containment (and distribution). This is the key component in designing the angles of a...

Transmitted Light 5.07

Transmitted Light (5.07)This part is a little more involved -- but not much. Transmitted light is the portion of light that enters the material, or a diamond in this case....

Section 2: Location and Mining

Section 2 Location and MiningOrigin 2.01Primary and Secondary Deposits 2.02Prospecting 2.03Mining 2.04Mining Methods 2.05Study Questions for Sections 1 & 2

Fish-eye 5.23

Fish-eye (5.23)A fish-eye is a girdle reflection seen just inside the table. When light travels through the girdle and reflects from a flat angled pavilion, the image of the girdle...

Handling a Culet 5.22

Handling a Culet (5.22)When handling a diamond, be very careful when holding it in tweezers between the table and culet. If there is a pointed culet (or “none” as printed...

The Culet 5.21

The Culet (5.21)The culet, the bottom point facet of the diamond, is for protective purposes only and serves no added value to the stone. When too large, it can severely...