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Estimating Depth
This closed back mounting looks suspicious, since it makes it impossible to measure the stone's depth.
Piggy-backing gives the illusion of a much larger diamond in the mounting. The side of the ring has been cut away to show the arrangement. A very flat diamond has been mounted in the upper and a very small diamond protruding through the bottom to falsify a much greater depth measurement in calculating weight.
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.
As previously discussed, the methods of determining the depth of a stone without taking actual measurements, especially come into play when these types of circumstances arise. The Table Reflection Method is very appropriate in helping to determine depth.
