Lennix synthetic Emerald, (flux-fusion)277 viewsDeveloped by M. Lens of France, these synthetic emeralds are grown as rectangular rather than hexagonal crystals and have a tabular habit. Their constants are slightly lower than those of the natural stone (R.1.=1.562, 1.566; D.R.= 0.004; S.G.=2.62-2.65).
Two-phase and three-phase inclusions resembling feathers and particles of flux are typical, as are spiky cavities. The most characteristic features are small crystal clusters looking like rosettes. The stones show a strong red through the Chelsea filter.
Chatham synthetic Sapphire302 viewsSimilar inclusions appear in Chatham synthetic rubies, with the addition of thin white-appearing needles of platinum (both straight and curved), transparent clusters of colourless hexagonal tabular crystals, white wispy veils of fine textured flux and white flux fingerprints.
Some blue Chatham synthetic sapphires luminesce pale green in L.W. U-V and dull green in S.W. U-V (natural blue sapphires are generally inert).
