We shall probably never know when the first Tiffany Style Diamonds were discovered, but we do know that, from ancient times until the eighteenth century, all the worlds jewelry came from India.
When diamond is cut too deep light leaks out the bottom, brilliance is lost, and the jewelry will appear to be dark.
The range of fancy diamonds prices can be dramatic depending on the size and quality. For example a half caret brilliant cut round diamond of K color and I1 clarity would cost about $2000 per caret or $1000.