A photo of the three stones described in the skeet. To the top left is the amethyst; it is more or less triangular. Below that is a stone which is purple at top and yellow at bottom. It is also triangular, but a long, thin triangle. The narrow end is the yellow bit. To right of both is a trio of very pale, clear blue stones in matching teardrop cuts
A closeup of the amethyst so you can see how the faceting creates a star shape when the light shines through it. It looks symmetrical in these photos but I swear it isn't; all three sides are subtly different
A better view of the stones! A very unusual asymmetrically cut 13 carat amethyst, a 3.5 carat "mystery purple stone" my dad bought (he declined to say how much he paid but claims it was not expensive...), and a trio of matched blue topaz teardrops. I'm inclined to think the mystery stone is ametrine