Common opal does not exhibit a flash of color.
- Black opals are the most rare and expensive versions of the gem, with a body color that can range from dark grey to black, and with fiery flashes of color.
- Precious fire opals are another unique choice, and you'll find that variety with transparent or translucent base colors ranging from yellow to orange, with fiery flashes.
How Hard Are Opals?:
Treat Opals with Care:
- Do not use harsh cleansers to clean your opals and do not place opals in ultrasonic cleaners.
- Never rub oil on an opal, because although it makes the fire brighter, oil can damage the stone.
- Some jewelers recommend that you periodically soak opals in water to help them reabsorb lost moisture.
Where Are Opals Mined?:
What Are Opal Doublets and Triplets?:
Inspect the sides of an opal, looking for indications that it's really layered slices. Check the stone's base to see if it matches the top. If it doesn't, the stone might be a composite.