Good Day All Brothers and Sisters I bought ruby filter from Hong Kong on ebay , seller sent me ruby filter with blue light torch , i was thinking it is UV light led torch but he said me this is blue light not uv light , you need to see ruby stones trough ruby filter with this blue light source. kindly tell me what is this ? this is true ? what is difference b/w uv light and blue light ? are these same lights or not ? i will be very thankful to you Irfan
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