Champagne's deeper register- burnt amber, russet, and the brown-red of a bottle held against a lamp. Natural body color formed in the crystal, untreated and unaltered. Saturation this deep changes what the cut has to do: facets that would read as brilliance in a colorless stone read as movement here.

Named for the way its facets open from a central point. Domed above, flat below, no pavilion and no culet. Cut since the sixteenth century and never about brilliance- it glows rather than flashes. The flat base gives it a broad face for its weight, and the shallow depth lets you see into the stone rather than off it.