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398                        THE DIAMOND
Sometimes common misunderstandings of trade terms lead writers and poets into error. An instance occurs in Emerson's " Destiny." He says:
Whether your jewel be of pure water, A rose diamond or a white."
Many suppose that the term " rose " as applied to the diamond, indicates the color of the stone. Evidently the poet thought so. It refers, however, to the cutting and may be any color. Nor is the " water " of a dia­mond quite definite. As a trade term it was never uni­versally used, but it became a favorite with writers, probably as a poetical phrase and from the knowledge that some tested the purity of a gem's color by drop­ping it in water; the purer, so much the less observable was it. If quite pure, it could not be distinguished from the water surrounding it, and was therefore said to be of pure water. The term is now nearly obsolete.
Who has not watched with keen enjoyment the light­ing up of misty dewdrops clinging to the grass blades of the meadow, or hanging tremulous upon shrub and bush, when the sun climbs over the eastern hilltop and fills the valley with cool sparks of purity?
Moore has indelibly fixed such a scene in his descrip­tion of the maid in " Reuben and Rose ":
" Rose, who was bright as the spirit of dawn, When with wand dropping diamonds and silvery feet, It walks o'er the flowers of mountain and lawn."
All the varied forms of play in which water is seen under the sun have sometime reminded a poet of the