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# Estimating Diameter in a Bezel

Since the diamond goes under the bezel, you must add its edge to the visible area when measuring diameter. Very often a mounting can be a serious hindrance in determining the proportions of a diamond. A perfect example is the… Continue reading

# Estimating Diamond Depth % | Piggy Backing Deception

The depth of the diamond can be truly impossible to measure in certain styles of mountings without removing the stone. In particular, this would include a closed-back mounting where the pavilion is completely hidden. Continue reading

# Diamond Crown Height vs Crown Angles | The Importance of Crown

After studying the illustrations presented in this course, you should be able to recognize the extremes in crown heights. Any mounting will allow you to get a good look at the side view of the crown in question. The only possible exception might be a flush set diamond that is recessed into the metal. Continue reading

# Table Size

Measuring table size in a mounted diamond should be easy to carry out since this large facet is generally very accessible. As discussed earlier, both the Table Percentage Ratio Method and the Table Percentage Bowing Method are almost as effective… Continue reading

# Determining Girdle Thickness for Mounted Diamonds

Girdle thickness can also be a problem in bezel-set diamonds since the perimeter of the diamond will be fully enclosed. Tilting the mounted diamond to reveal the girdle reflection can be very helpful, but caution is advised. This reflection is… Continue reading

# Pavilion Angle/Depth

Even though this diamond measures an acceptable 63% depth the crown and pavilion angles are far from acceptable. A deep pavilion and a flat crown could portray a deceiving favorable depth percentage. The pavilion angle or depth will also have… Continue reading

# Cutting Styles

The last resort of a cutter in getting maximum weight retention, is to cut steep pavilion angles, which results in lost light containment in the finished product. By sacrificing pavilion angles, the cutter must be aware of the inevitable black hole that comes with it. Continue reading

# Proportions Do Affect Value

Obtaining a clear picture of a mounted diamond’s proportions is critical in determining overall value. Estimating accurate proportions is every bit as important as color and clarity grading. Proportions are becoming an important issue as consumers become more aware in… Continue reading