When considering a coloured gemstone's clarity, you should measure your expectations against the
standard for that variety of gemstone. Some varieties of coloured gemstones, such as aquamarine,
blue topaz, and citrine, have naturally fewer inclusions while other gemstones, such as emerald and
ruby, tend to have a higher rate of acceptable inclusions.
Clarity is an important factor in comparing quality coloured gemstones. Even opaque opals can have
milky inclusions that will affect their irridescence and colour play. In general, the best values are
available in gemstones that are moderately included. Exceptional gemstones with few or no
inclusions are available, but they can command extravagant prices.