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...slate blue. There are also colorless varieties, known as ''adularia'' or "rainbow moonstone", which are especially prized. Regardless of color, all moonstone ...[[blue]] ''schiller''. Sometimes known as Madagascar moonstone, the term "rainbow moonstone" can apply to this stone as well.

...of the gem. But in fact tourmaline can occur in nearly every color of the rainbow, and each variety is named for its predominate color. ''Rubellite'' (pink t

...n_arms.png|150 px]] | caption = "Honor Before Victory"<BR> [[Argent]], a [[rainbow]] [[gules]], [[argent]], [[azure]], [[Or]] and [[purpure]], [[clouded]] wit

<td rowspan="2">[[Rainbow]]</td> <td>Rainbow, natural</td>

...the opal being imitated, one might consider [[moonstone]], especially the "rainbow" variety. Another good possibility is ''spectrolite'', a high grade variety