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Under sunlight and cool LEDs it's a nice orange, but it shifts easily, changing color between Cool LEDs (orange), Warm LEDs (yellow), CFL (strawberry pink), and OLED (magenta) as well as under fluorescent lighting and OLED illumination.  Sunlight shows an orangeish-pink.\u003c\/p\u003e\n\u003cp\u003eEr:YAG doping usually is a fairly high percentage, ranging from 30% to well over 50%.  It is possible that this material actually has more erbium yttrium than yttrium, which would technically make it Yttrium-doped Erbium Aluminum Garnet (Y:ErAG or EAG)\u003cbr\u003e\u003cbr\u003eYAG in general is an ideal material for faceting, which a high hardness of 8.5, no cleavage, no problems with polishing and excellent optical properties with an RI of 1.82. It is considered one of the easiest materials to facet.\u003c\/p\u003e","brand":"Turtle's Hoard","offers":[{"title":"Block, 9.7×9.1×7.6mm, 3.16g","offer_id":51799125131552,"sku":"Rgh_YAGEr_00120260604","price":55.0,"currency_code":"USD","in_stock":true},{"title":"Block, 11.7×9.1×7.4mm, 3.28g","offer_id":51799125164320,"sku":"Rgh_YAGEr_00220260604","price":56.0,"currency_code":"USD","in_stock":true},{"title":"Block, 10.7×8.6×8.3mm, 3.58g","offer_id":51799125197088,"sku":"Rgh_YAGEr_00320260604","price":58.0,"currency_code":"USD","in_stock":true},{"title":"Block, 11×10.5×7.3mm, 3.41g","offer_id":51799125229856,"sku":"Rgh_YAGEr_00420260604","price":57.0,"currency_code":"USD","in_stock":true},{"title":"Edge, 12.4×10.3×10mm, 3.48g","offer_id":51799125262624,"sku":"Rgh_YAGEr_00520260604","price":57.0,"currency_code":"USD","in_stock":true},{"title":"Edge, 11×10.2×10mm, 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