I am not surprised they sometimes substitute topaz for citrine, which is a sort of toasted quartz, the first is so much more expensive!

I am not sure what blue topaz is really composed of, but the imperial topaz has always been golden and has a striated body, very different from citrine. Though I love both, they are completely different stones.

Blue topaz is usually heat treated yellow topaz, much like Citrine is heat treated Amethyst, although you can get both naturally too heat treated by mother Earth and her magma and volcanoes

Thank you, Gem!  

I knew about citrine, but not about topaz. I have a golden topaz which I take good care of, but my little polished citrines I can carry with me like candies in my pockets without fearing about losing them, since they are so much cheaper.

I read in your first sticky here that topaz is good for my star sign and my birth month. Also turquoise and some other I cannot now recall (and I have also read it in some books), but I do not feel very attracted to those stones, even though I have them.

I feel better surrounded by the quartz family: what is this good for? Am I seeking a special virtue within the quartz? Of them, citrine is my favorite, though by my bed I have a big pink quartz and some amethyst.  

It said for aries that diamond is one.  I am an aries, and I personally dislike the diamond.  It kind of repulses me.  I would wonder who came up with what stones are lucky for what months/signs, and why.  If everyone is so different, why not things like that!?

thanks for the information. but can you put pictures and images for these gems to know them better. because i have many gems but i don't know the name of every one. thank you.