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I agree with you 500 but if you use a tube just lock the front with a screw into the length of the tube. Then remove it to clean with Windex, Carb cleaner or other spray. Dry then reinstall the screw. If the inside of the tube stays bright maybe it will bounce back some lost light. Maybe there is little loss of light. A diamond in brilliant cut seems to be a great multiple prism. Carpetsahib, do those stones lose light behind them if cut right? TIA Rustyzipper

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I/m working on a new design that will eliminate most cleaning issues. A round brilliant cut diamond will pass light from back to front, so backlighting is a good idea. However, a correctly cut stone will exhibit total reflection in the case of a light ray coming in the front. The reflected ray then exits the front, exhibiting a spectrum, exactly like a prism. Thus, diamond's incomparable sparkle.

Here is another shotgun sight, this time with a blue diamond.