Standard heated like nearly all sapphire on the market. No diffusion or other treatment. Please view our other listings for more fine gemstone and jewellery pieces. Our stock is stored offsite in a safe deposit vault so there may sometimes be delays in dispatch. All our products are tested by a gemmologist with the following qualifications.Distinction grade in gemmology with the Gemmological association of Great Britain (Gem-A). Accredited jewellery professional (AJP) with the Gemmological institute of America (GIA). Fellow of the Gemmological association of Great Britain (FGA). We only deal in natural, earth mined gemstones and describe all our listing as accurately as possible. Photographs taken at 20x zoom with only natural daylight and no photoshop. All items are sent tracked, signed and insured in nondescript parcels. This item is in the category "Jewellery & Watches\Loose Diamonds & Gemstones\Loose Gemstones". The seller is "gemsandjewelsuk" and is located in this country: GB. This item can be shipped worldwide.