color change 好似唔係咁解bor.我Google 咗一下:\"A rare variety of natural sapphire, known as color-change sapphire, exhibits different colors in different light. Color change sapphires are blue in outdoor light and purple under incandescent indoor light, or green to gray-green in daylight and pink to reddish-violet in incandescent light.\"我見佢張cert 都係咁寫。