As just a gem aquamarine perfectly set in a large, euhedral crystal of orthoclase, this specimen would have been nice enough. But there is more: at the back side of the termination, you can see a small raised extention; this is actually the termination of a slender crystal which formed first, and became the seed of the larger crystal, so that now you have a crystal-in-crystal! You can see the engulfed crystal right through the super-clear gem quality larger crystal, running down its back side! Look at this through a magnifying glass when you receive it and you will be as astonished as I am! The main crystal is gemmy, undamaged and perfectly terminated, and measures 3 cm top to bottom. 4.5 x 3.6 x 3.2 cm