It's amazing to see beryl triplets in the gem + jewelry market despite information about the imitation (s) via trade journals/ gemological books/ seminars/ workshops by experts from around the world. The victims include jewelers, gemologists, gem traders + the public.
A beryl triplet is a deception. It has no value. It consists of a crown of colorless beryl (goshenite) or any clean, very light colored beryl (pale aquamarine), and a pavilion of the same material cemented together with a green chromium-based cement. The purpose of the goshenite material is to have the refractive index and specific gravity values in the range of beryl. The green layer of cement is reflected throughout the stone by the facets so that the face-up color of these imitations show good emerald-green color.
Immersion in a suitable liquid will easily show the three parts of the triplet. With some practice + proper magnification (loupe + microscope) one should be able to see the separation plane.
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