The Lovenhall RegistryThe LovenhallRegistry
Lovenhall DiamondInstrument
The Instruments

Depth & Table

The two numbers that decide how a stone returns light.

Shape
Diameter (min)
mm
Diameter (max)
mm
Total depth
mm
Table width
mm
The flat facet on top.
Proportions

Excellent

Depth 61.4% · Table 55.3%

DepthExcellent · ideal 59–62.8%
TableExcellent · ideal 53–58%

Both figures are measured against the average girdle diameter, as a grading report does. Fancy shapes carry far wider allowances than a round brilliant.

The Lovenhall RegistryBeyond the Proportions

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Its measurements, its papers, and a permanent accession.

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