The descriptive terms used in the Gemstone Industry can be technically sounding terms and confusing to a purchaser. Here is some information about the Iridescence of gemstones.
Iridescence of Gemstones
Iridescence implies all sorts of rainbow effects with the gemstone. Schiller and Labradorescence are varieties of iridescence. Mother-of-pearl is the most familiar example of iridescence, but it is also found in fire agate and some obsidian as well as many artificial gems and jewelry. Labradorite gemstones have high levels of iridescence.
The descriptive terms used in the Gemstone Industry can be technically sounding terms and confusing to a purchaser. Here is some information about the Colour Change and transparency of gemstones.
Colour Change in Gemstones
Some gemstones change colour when they are put in different aspects of light and especially when placed in front of sunlight. This is due to a gemstone’s ability to absorb wavelengths strongly. Change of colour is not the same as the changes in colour with crystal orientation that affects tourmaline and iolite. The later is due to the optical property called pleochroism.
Transparency of gemstones