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big hole crystal beads18419 viewswholesale crystal beads
Lennix synthetic Emerald, (flux-fusion)5899 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.
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SI25877 viewsThe SI2 grade bridges the gap between the slightly included diamond and highly included diamond. These are diamonds that contain inclusions easily seen with a magnifying glass, and may be visible to the naked eye.
Ramaura synthetic Ruby6141 viewsThese stones are manufactured by JO Crystal Company in California. Inclusions consist of various forms of flux, particularly coarse orange-yellow flux and white flux "fingerprints".
These features, together with colour zoning, "comet tail" inclusions and conically shaped feathers can provide conclusive proof of synthesis. Another identifying hallmark of the Ramaura ruby is the parallel graining or growth lines, also described as the "Scotch in water" or "heat wave" effect.
What may, however, prove to be the main identifying feature of the Ramaura ruby is its fluorescent zoning under L.W. U-V; the manufacturer claims to have introduced a rare-earth dopant to make the stone more easily identifiable when exposed to U-V.
This fluorescent zoning occurs in thin areas just below the surface. It varies from intense to very intense, and has a colour that ranges from distinct sulphur yellow through yellowish orange to a nearly pure orange. Although generally quite thin, these zoned areas also possess a dull; chalky translucent appearance. Unfortunately, some cut stones have been seen that don't possess this tell-tale fluorescence.
