It's pretty easy to understand how the round brilliant and the oval diamond cuts got their names. But the marquise? Now there's a story! And it should be no surprise that royalty is involved yet again. Read all about it in today's blog post. * vintage * vintage style * vintage fashion * vintage fashion * vintage jewelry * antique * antiques * antique jewelry * jewelry * jewellery * king * mistress * scandal * royal * French * jewelry blogger * style * fashion * Katie Callahan & Co.