Hologram Crystal (Iron-Doped Lithium Niobate) faceted Stones Marked Letter:Dark 7mm Round Cut avg. 1.7ct Each can be purchased by

Each can be purchased by their weight range

This is easily one of my favorite gems

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Due to quick cooling rather than a single large crystal

easy-to-use cheater with 1/4 degree markings

Hologram Crystal (Iron-Doped Lithium Niobate) faceted Stones Marked Letter:Dark 7mm Round Cut avg. 1.7ct Each can be purchased byThese are faceted hologram crystals, aka iron doped lithium niobate. They are available in calibrated sizes and in fancy cuts. We have both light and dark toned stones depending on the dopant level. This is a really cool crystal in particular iron doped lithium niobate is grown for use in holographic storage. This is an emerging field (ok, it's been emerging since the 80s but still in progress) which allows data to be stored directly in a crystal