{"product_id":"tables-of-gemstone-identification-birgit-gunther","title":"Tables of Gemstone Identification - Birgit Günther","description":"\u003cp\u003eMore than 25 years of international use have established these Tables as an effective tool in the identification of gemstones, synthetics and imitations and therefore the presentation and layout have remained unchanged. Nevertheless, the content has been partially reworked and updated to include the following new items:\u003c\/p\u003e\n  \n  \n  \u003cp\u003eStones previously given in the Supplement to the Tables (1991) have now been listed in this edition in their appropriate order of increasing refractive indices.\u003c\/p\u003e\n  \n  \n  \u003cp\u003eAdditionally those minerals meantime found in gem quality are included.\u003c\/p\u003e\n  \n  \n  \u003cp\u003eFurther a new arrangement and complete range was especially necessary with synthetics as their number has so increased over the years. Details specific to production techniques and diagnostic properties have been listed tabularly.\u003c\/p\u003e\n  \n  \n  \u003cp\u003eAdditional facts of known mineral groups have been added, e.g. new colour varieties.\u003c\/p\u003e\n  \n  \n  \u003cp\u003eAn increased number or occurrence of stones previously considered infrequent gave multiple measurements and has led to an expansion of the ranges in physical data.\u003c\/p\u003e\n  \n  \n  \u003cp\u003eThis present volume contains almost fifty new entries of precious stones and synthetics.\u003c\/p\u003e\n  \n  \n  \u003cp\u003eThis 3rd edition provides the practising gemmologist with increased and up-dated data on which to rely assuming accurate and systematic identification procedures.\u003c\/p\u003e","brand":"DAVTOOLS","offers":[{"title":"Default Title","offer_id":45052720513345,"sku":"BKS-6526","price":99.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/0718\/9569\/products\/tables_of_gemstones_-_birgit_gunther.jpg?v=1765185619","url":"https:\/\/davtools.com\/ar\/products\/tables-of-gemstone-identification-birgit-gunther","provider":"DAVTOOLS","version":"1.0","type":"link"}