If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, withing 24 hours on weekdays.
Customer service
All questions about your order, return and delivery must be sent to our customer service team by e-mail at yourstore@yourdomain.com
Sale & Press
If you are interested in selling our products, need more information about our brand or wish to make a collaboration, please contact us at press@yourdomain.com
Help
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, withing 24 hours on weekdays.
Customer service
All questions about your order, return and delivery must be sent to our customer service team by e-mail at yourstore@yourdomain.com
Sale & Press
If you are interested in selling our products, need more information about our brand or wish to make a collaboration, please contact us at press@yourdomain.com
The world standard is back by popular demand! This completely revised, updated and expanded version of Dr. Downing's 1992 Opal Identification and Value is a 'must have' for all appraisers, opal buyers and opal lovers. Learn to properly identify opals from all over the world. Many new locations have been added along with new methodology to determine the characteristics that affect value, then determine price from updated value tables. Ascertain if the opal is a natural solid, boulder, doublet, triplet, dyed or labcreated. Be able to ask definitive questions when considering an opal. Learn what to look for in properly set jewelry. Become a confident buyer, seller or appraiser by distinguishing an ordinary opal from an outstanding one.
⚠️ WARNING (California Proposition 65):
This product may contain chemicals known to the State of California to cause cancer,
birth defects, or other reproductive harm.
For MAP (Minimum Advertised Price) violations and Intellectual Property (IP) or Trademark concerns, please contact:
support@ergodebooks.com
⚠️ California Proposition 65 Warning: Some products sold on this website may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
