Straightforwardness could be how much light is transmitted through a gemstone.
The terms used to separate the measure of light transmission through a gemstone are:
Straightforward. Light goes through moderately unhindered. A realistic or question is seen through the gemstone without much contortion (aside from that subsequently of aspects or twofold refraction).
Semitransparent. Light goes through it is marginally diffused. A realistic or protest is seen through the gemstone however with a diagram that is vague marginally bended.
Tanslucent. Light goes through yet questions is not recognized through the gemstone.
Semitranslucent. Light goes through just in the thin edges with respect to the gemstone.
Obscure. No light is transmitted through even in the thin edges with respect to the gemstone.