This is a beautiful glassy and gemmy, colorless, 'macle' twin diamond weighing 3.28 carats. The crystal exhibits the wondrous adamantine luster found only in diamond, and a few other mineral species. A macle is a naturally twinned diamond, and is sturdy and appealing enough visually to be used in jewelry (as part of new trends involving the use of natural crystals). But, this is ALSO a truly fine and world class crystal of diamond as a thumbnail specimen, as well! With a macle twin, you can get a lot more visual impact for the money, than a traditional (and more common) octohedral diamond crystal, which has a smaller surface area to volume ratio.