Orange Flash of Opticon Filling in Emerald326 viewsFilling fractures with a resin of similar RI to the host emerald typically produces a color flash effect. In this case, an orange flash is seen. (Photo: R.W. Hughes)
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Three Phase Inclusion in Emerald340 viewsAnother negative crystal in a Colombian emerald, this one containing more than one daughter crystal.
(Photo: R.W. Hughes)
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Orange Flash of Opticon Filling in Emerald332 viewsSame emerald but tilted slightly, so that the colour flash is now blue. (Photo: R.W. Hughes)
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Classic three-phase inclusion of a Colombian emerald338 viewsDue to the conditions under which they form, most emeralds contain numerous fractures and openings. This photo shows the classic three-phase inclusion of a Colombian emerald, consisting of a negative crystal filled with a gas bubble, a halite crystal and a brine solution. If cutting exposes this inclusion to the surface, it will fill with air, producing reflection. Such inclusions are typically filled with oil or resin to reduce the amount of reflection. (Photo: R.W. Hughes)
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427 views
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Regency synthetic Emerald323 viewsThis synthetic emerald is grown using the original Linde technique and Union Carbide patents. Constants are generally close to those of the natural stone, although the S.G. is slightly lower, at 2.68. There's very little iron content, with the result that the stones have a high S.W. U-V transmission factor and a strong red fluorescence (even under a beam of high-intensity white light).
Typical inclusions are wedge-shaped, dagger-like growth tubes, two-phase features stemming from phenakite crystals, and type of feature.
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Synthetic Russian Emerald329 views
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Chatham synthetic Emerald332 views
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Synthetic hydrothermal Emerald321 viewsCharacteristic inclusions include two-phase feathers, nail-like microscopic crystals, and elongated flowing growth features. The stones may also contain small lengths of tubular two-phase inclusions (probably growth tubes).
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Emerald, natural, Brazil333 views
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Lennix synthetic Emerald, (flux-fusion)309 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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Quartz, green, dyed305 views
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