Square Envelopes - Ruby Red - 8.5 in SQUARE EnvelopesLUX Paper is proud to show off its collection of fierce, bold LUX Colors. Once the gorgeous ruby crystal is cut and polished the familiar ruby color is exposed. LUX Ruby is named after this popular gemstone color. A true deep red is not only a great choice for holiday and black tie events, it is also sure to grab the attention of anyone in its path.