All our colored gemstones & Color Diamonds, except Tsavorite, Garnet etc., are "E" (Enhanced) and/or "T" (Treated). In general, some of the enhancement methods used are heating, oiling, filling, with resin agents etc. Some of the treatment methods used are coating, diffusion, dyeing, joban oil, glass filling, irradiation, lasering, etc. We do not know the methods used prior to our purchase from the suppliers since each country uses different methods. If required, we may send the Gemstone(s) to a Gem laboratory for more information prior to your purchase.Products shown are subject to availability.Alphaimports.com is not responsible for and need not honor typographical or pricing errors on the site.