I have bought the same square cut 6mm earring in Amethyst, Peridot, and Citrine, so I was pretty sure I was going to get the same high quality from Amazon.com Collection jewelry.  The topaz is a clear, warm brown, not too dark, not too light, rich color.  The 6mm looks huge on my ears, so I can't wear any larger stones.  I feel the quality for the money is unmatched.