The American Gen Trade Association (AGTA) has completed producing the CIBJO Retailers' Reference Guide, reports say. The Guide is a comprehensive reference for retailers to help them provide accurate information to clients on coloured gemstones, diamonds, pearls and precious metals. %% The Guide is the outcome of a collective effort by CIBJO members worldwide, and serves as a reference and training tool for any jewellery company across the globe. A free copy is being provided to every AGTA member.%% To make reference search easy, the book has been created with easy-to-read tabs and key facts pages which inform about important quality factors for each category. The guide also focuses on specific gemstones, reports add.