Emerald is one of the most precious gem, its green is sterling, rich and gaudy and beautiful, it is the king of green gem. Emerald breed is very much, the famousest have parrot green, also have gorgeous be like peacock feather color colour, friend says “ beryl “ . Emerald is green medium coronal, its are green because contain the chromic element of minim to cause,be, green is glittering and translucent colourful beauty, hardness is very tall, refractive index is strong, diaphaneity is good.
According to textual research, emerald by the Silk Road transmits our country, time but the Han Chao that the commerce between restrospect to China and Persia interacts. Of emerald say the likelihood appears at 16 centuries, this one phraseology is Emerald of language of traceable ancient Persia. Emerald is one of the costliest gem, it ascends all the time personally at minority precious gem. The most outstanding emerald is Colombian emerald. The product of this area, quality is high, colour and lustre is clear, give priority to with clear green, still have take yellow green a bit or take blue green a bit. Brazil cling to black forehead, Kanaba, finish according to calm pull emerald, overall stress facial expression more shallow, density is inferior. Businessman to increase economic value, undertake some Brazil emerald rework, if dip is colorless oily, note model to wait. This kind of treatment, blame expert is indistinguishable. Russia Siberia emerald, in the mine that originates in area of corvee labor formerly imposed on Xizang serfs, majority is contained yellow, accompany have more flaw, and color is light Yugelunbiya‘s emerald. Zimbabwe emerald, produce the BelingiveNatireReserre section from Zimbabwe, the variety with high quality is less, crystal middling is put in the flaw. In color respect, have the beautiful bottle green in a few emerald now and then. Tanzania emerald, produce the south bank area from Tanzania Mangara lake, be from biotite the contact of firm cliff finds in the belt, the Mufo lapidary close of their character and Colombia. It is the green with yellow belt normally, also have the green variety with blue ribbon sometimes. Still have Zambia emerald, what show in a way to take ash mostly is tonal, likely the wrap up form that amid discovers yuan of mother, amphibole, actinolite or tremolite.
Emerald place of production is very much, colombian nature is optimal, the emerald Dou Youjia that other source produces is tasted. The element of emerald character appraisal is color above all, green wants, rich and gaudy is fresh and green and pleasing to the eye, quality of a material is transparent, foreign matter wants little, want clean. Normally, the quality of a material of emerald has “ assistant grain “ , resemble fly wing grain same, assume transparent glacial crackle position. Emerald although hardness is tall, but brittleness, the structure submits a form, bump easy come off. Emerald also has the branch of new hole old hole. Old hole water penetration is strong, hardness is taller, the material water penetration of new hole is insufficient, hardness is inferior. Emerald stand or fall affects value, old hole diaphaneity is good, color rich and gaudy, quality of a material does not have foreign matter completely, do not have a person that crack to be top grade, value can be compared with precious diamond photograph; Conversely criterion value is inferior.
Emerald has a lot of copy to taste. Relatively simple is green glass copy is tasted, this very easy appraisal, the most important distinction is, glass has bubble, emerald is done not have. Still have reflected on specific gravity, refractive index, hardness different. Vitreous proportion light Yu Baoshi; Gem has birefraction, glass is done not have; Vitreous hardness under gem, the metropolis side some edges and corners shows flaw. More advanced copy is tasted is to use royal seal of green green jade to pretend to be emerald, royal seal of green green jade also has lapidary light, dan Jijing body is multilayer cylinder shape, brilliant face contains vertical stripe, crystal interior has a few acerose capillary, the emerald of this and assistant grain structure is having essence to distinguish. Additional, the color of royal seal of green green jade shows sap green to come olive, not be green in the belt is yellow, it is green in extensive is blue. Still have a distinction, emerald grain is big not much, and royal seal of green green jade is opposite and character, the shell is old, piece the area is large.