opal

…too, but be very careful about heat build up with opal. Stones get hot quickly during polishing, and heat can destroy opals. Jade, on the other…

…O OPAL Black Opal, tone N1 to N4 Carat Weight Below commercial Commercial Good Fine Extra fine 1 to 5 $10 – $100 $100 – $300 $300 –…

…half-degree C per minute. Opal Mexican cherry opal (or bright red fire opal) needs to be dried carefully or it will craze. This can occur long…

…Birthstone for September?”]Sapphire is both the modern and traditional birthstone for September. [/hdcro-faq] [divider] October…

…has a bright orange-red hue and characteristic haziness. © The Gem Trader. Used with permission. Fire Opal The “fire” in…

…there is a variety of natural opal also called “opalite.” However, this term is primarily used to refer to the glass material.…

…eye-catching gems. Opal also has a rich folklore. In blue hues, a precious opal’s play of color can resemble sunlight on the ocean’s…

…ring stone under the light. Black Opal Black opals are the rarest and most valuable type of opal. The vast majority (98%) comes from Lightning…

…grading opals, see our article on appraising opals and our opal buying guide. 14-ct, faceted Welo opal with honeycomb structure. © Mark…