There are not any real statistics related to the issue of "natural" versus "enhanced" stone beads.

But let's look at it this way.

India has made the largest volume of carnelian beads, for the longest time, exported to the most far-away places around the world. Their output must be greater than any other industry, and possibly as great or greater than all the others put together.

We know that Indian carnelian is essentially "created" via the process of heat-treating; and that in modern times practically ALL of the commercial carnelian has come from Germany and is actually artificially colored.

If someone says "this carnelian is natural," (not regarding any particular industry it may come from), MOST of the time that would be a mistaken statement.

So, if you assume that any carnelian object is artificially enhanced (whether by simple heating or chemical baths and acids), MOST of the time you would be correct.

JDA.