Question to ask when dealing with transparency: is the color gem hazy or clear? Is it translucent or opaque? You can yourself determine the answer to these by holding the gem up in the light, the opaque won't let light through. In most cases a higher transparency will make a stone more valuable But in the case of black opal and ruby the contrary is true, an almost opaque ruby for example will sell for more.
Other color stone factors that affect price:
• Carat weight
