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Blue Chalcedony
and various jewellery alloys
Diamonds' is the leading guide of its kind to learning about these precious gems and understanding the main factors that determine their value and quality
A very comprehensive look at all things diamond
Special compound to preserve polishing during the welding process
Tables of Gemstone Identification - Birgit Günther pickup-only Blue ChalcedonyMore 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: Stones previously given in the Supplement to the Tables (1991) have now been listed in this edition in their appropriate order of