Opal
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- Page Code Description €/Pcs
- Leopard Opal: Play-Of-Color Opal in Vesicular Basalt from Zimapán, Hidalgo State, Mexico
- What's New in Neck Adornment
- Silver Fetish Rings
- Gemstone Firing Guide
- IN LOVE with ENAMELLING There Are So Many Different Enamelling Techniques That Approaching the Whole Subject Can Seem a Little Mind-Boggling at Times
- Black Opal Metaphysical Properties
- Letter Circular 547: Preparation and Colorimetric
- Hyalite Opal from Zacatecas, 470 Practical Gemmology Mexico a Matched Pair of Opals, with by Emmanuel Fritsch, Peter K
- Da42-Vi Exterior & Interior Design
- Gem Stones in Washington
- Summer 2010 Gems & Gemology
- Redalyc.The Gemstone Deposits of Brazil: Occurrences, Production And
- Summer 2002 Gems & Gemology
- Enamels for Sheet Iron and Steel
- HPHT) Processing Is a New Technology That Makes Permanent Color Change in Diamonds Possible
- Gems, Minerals & Jewelry
- Black-Diamond-With-Black-Diamond.Png