Natural Silver Topaz is one of the prettiest stones there is. These stones are excellent examples -- well cut and full of sparkle.
If you wonder why it's called Silver Topaz rather than White or Clear Topaz (you've never heard of Silver Sapphires, now have you?) -- clear Topaz has a Silvery sheen to it. The name just pops into you head when you see it.
Here we have them in a traditional four prong basket style mounting. | 
