For many years it has been recognised as an acceptable practice to lessen the appearance of natural inclusions in emeralds with oils and resins. Indeed, today it is almost universally recognised that most - up to 99 of - emeralds will have some level of treatment, judged by the amount of oil or resin used. Minor treatment is already a greatly desirable attribute for a gem emerald, but to find gems of the highest quality without any sign of treatment - as completely natural as the earth intended, excepting the cutting and polishing of the lapidary - is unusual. Moreover, in the case of stones over 10, and certainly 15 carats, of such a clean material and uniformly pleasing colour as the emerald being offered here, the purity of such a gem-quality crystal is particularly noteworthy.