This 7.44 carat, 11.5 mm. gem is the last of my ametrine parcel purchased from Steve Ulatowski / New Era Gems last February in Tucson.
It was another experiment to see if the gold / purple color break could show up and still have a stone that sparkles and glows.
The camera shows the color variation better than it appears to the eye.
This stone was as much for fun as for anything else. It is a 8.47 carat prasiolite, 13.2 mm.in diameter. The pavilion had a row of narrow concave facets splitting the normal culet row facets. Then the crown was rounded up to the table instead of using rows of flat facets. Finally a number of concave facets were added to the crown.
The cameral once again sees things the do not quite match what I see. The pattern in the center is not something that I "see". and the light and dark pattern is much more subtle.
Here is a 5.97 carat ametrine which measures 10.4 mm. across. In an experiment to see if the two colors would show rather than mix, I tried using concave facets on two sides of the pavilion to make it really bright, and using steep angles on the other two sides (similar to a method used for closed C axis tourmalines.)
It seemed to work somewhat. As usual, the camera showed the difference more than it seemed to me. And also added a bit an impressionist painting look to the stone.
Pictured here is a new 5.44 carat, 11.0 mm. prasiolite. As mentioned previously, I find the hexagon cuts attractive. Here the light and dark patterns from the concave facets used on the pavilion of the stone are much more obvious to the camera than to my eyes. The result reminds me of an iris flower (another favorite of which I have too little in my garden.)
Another item that was obtained during 2018 Tucson, this 5.26 carat dark orange citrine is material from Uruguay. The pavilion features a row of concave facets to give it an extra glow. The stone is 9.8 mm wide. And how did that piece of lint get by during the photo session?
Pictured here is a 4.64 carat ametrine that is 10.3 mm wide and has concave facets on the pavilion side.
The rough material for this stone is Bolivian origin obtained from New Era / Steve Ulatowski during the Tucson Gem shows last February. Before it was cut, it was easy to see that the amethyst / purple was isolated on less than half of the stone, but now the colors reflect and mix.