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You can test the diamonds and the tanzanite stones for yourself with a UV light, no expensive machine required — shining any type of UV light over these will show fluorescent quality of al stones. Tanzanite and diamonds fluoresce with different colors: tanzanite fluoresces purple while diamonds fluoresce as green or blue.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.