So once things were more or less caught up after Tucson, it was time for additional experiments with concave and fantasy variations. First up is a 12.0 mm., 5.24 carat amethyst pentagon where concave facets were used for every other pavilion facet reaching the culet.
Next is this hexagon shaped amethyst which is 12.31 carats and is 14.5 mm. across. Similar to what was done with the pentagon, this one has every other culet facet done as concave rather than flat facets.
The third amethyst in this group is 14.0 mm. across and weights 13.47 carats. The concave facets were placed on the pavilion corners and as the center culet facets.
Then, for fun, a series of four round amethysts ranging in size from the 8.79 carat, 13.6 mm. one pictured above down to an 8.9mm., 2.58 carat version. The culet facets of the pavilion were done as concave facets. The diameter of the mandrel used for these was adjusted as the diameter of the stone changed. Then for the crown, instead of the usual series of flat (or concave) facets, it was done as a single ring .