《21世紀(jì)高等教育珠寶首飾類專業(yè)規(guī)劃教材:珠寶專業(yè)英語》是寶玉石及其鑒定、加工、商貿(mào)、文化等方面的專業(yè)英語教材。涵蓋了寶石學(xué)科各方面的內(nèi)容，包括寶石的概念與分類、寶石的光學(xué)性質(zhì)、寶石的力學(xué)性質(zhì)、寶石的鑒定儀器、寶石的合成、寶石的優(yōu)化處理、寶石包裹體、寶石的鑒定步驟、寶石的加工、部分珍貴寶石（鉆石、紅寶石與藍(lán)寶石、祖母綠、珍珠、翡翠）的寶石學(xué)特征和寶石商貿(mào)等內(nèi)容。《21世紀(jì)高等教育珠寶首飾類專業(yè)規(guī)劃教材:珠寶專業(yè)英語》共有16課，內(nèi)容相互獨(dú)立，每課包括珠寶銷售對話、專業(yè)詞匯訓(xùn)練、關(guān)鍵短句、短文、課文、詞匯表和練習(xí)題，寶石各論的幾課后還附有與課文內(nèi)容相關(guān)的閱讀材料。本教材參考英文書刊和專業(yè)網(wǎng)站編寫，內(nèi)容豐富、題材廣泛、語言流暢、文字活潑、圖文并茂，具有較強(qiáng)的可讀性。使用過程中可根據(jù)具體教學(xué)或?qū)W習(xí)情況做適當(dāng)取舍。參考學(xué)時(shí)數(shù)為60～80學(xué)時(shí)。

　　《21世紀(jì)高等教育珠寶首飾類專業(yè)規(guī)劃教材:珠寶專業(yè)英語》的設(shè)置體系兼顧英語教學(xué)和珠寶專業(yè)教學(xué)的規(guī)律，內(nèi)容全面、條理清楚、通俗易懂、實(shí)用性強(qiáng)，適合用作珠寶首飾和相關(guān)專業(yè)的本科和高職高專等層次珠寶首飾專業(yè)英語的教學(xué)參考書。并可作為廣大珠寶首飾從業(yè)者和愛好者的學(xué)習(xí)參考書以及珠寶首飾相關(guān)培訓(xùn)用書，也是珠寶首飾高級銷售人員學(xué)習(xí)的專業(yè)工具書。

　　A reflectivity meter can be used with gemstones having of any refractive index,even over 1.81.UV LW/SW Light for Testing Luminescence/FluorescenceGems that emit visible light after exposure to short-wave or long-wave ultraviolet radiation,they are said to be luminescent,or more specifically,flourescent.A gem is phosphorescent if the luminescence continues after the UV light source has been removed.This phenomenon of fluorescence and/or phosphorescence is the result of UV radiation absorbed by impurities or structural defects within the crystal structure,resulting in an oscillation of electrons between energy levels,and transmission of visible light.
　　Fluorescence produces vivid colors when an ultraviolet or invisible light source is directed at a gemstone.Where did this term come from?In the middle of the nineteenth century,Professor George Stokes was experimenting with sunlight and the mineral fluorite.He was in a darkened room and admitted sunlight through a small hole in a window shutter.When sunlight fell on a col-orless fluorite specimen,he noticed the mineral displayed a bright blue color.Stokes coined the term fluorescence to describe the phenomenon he observed from the fluor-spar or fluorite,which he said was analogous to opalescence observed in opals.Therefore,fluorite is the basis for the word fluorescence but not all fluorite fluoresces!The fluorescence can be a bold green,orangishred,or whitish blue,and vary in intensity.Fluorescence may be unpredictable because some gems will have no reaction to the UV light source.
　　In rough material,a cleavage break may already be obvious or it can be determined by giving the specimen a tap with a hammer.Rough diamond is often cleaved and then cut into shapes.Cleavage is not possible to observe in fashioned gems unless an internal imperfection can be observed or there is an accidental blow struck along a cleavage direction and the gem breaks.