A bunch of devices (laser diodes, microprocessors, high power RF GaN amplifiers) that'll run lots cooler on diamond heat spreaders; diamond Raman lasers (high efficiency & power); large single crystal diamond wafers - nothing most of us would pick up off the sidewalk, but might be very important.

I do have 3 CVD gem brilliants (blue, pink, colorless, 2ct. each) that a local jeweler is putting into a 30th anniversary piece for my wife. That makes me grin in anticipation of the surprise gift - my kind of bling.