The new Monocle theme is Jewel Tones. After consulting with The Google I came to the conclusion that jewel tones are rich hues of blue, purple, red, yellow, and green with some deep pink (magenta?) and teal mixed in. Or they're just pretty colors that work well in winter. Anna Wintour will surely quote me on the latter.
Rob's contribution to this post is a photo of Jewel wearing a jewel tone. I won't ruin this profound moment with words.