The color is great, the luster is top quality, the clarity is like a gem, totally clean and clear...you just could not ask for more in a classic Russian heliodor of this size. From a freak gem pod encountered in the late 1980s, these are modern classics but few are arou ndthe market these days having been absrbed into collections or (close your ears!) butchered for cuttting rough. When heat-treated, these turn into luscious blue aquamarine crystals which can be cut at a much higher price than heliodor gem rough goes for - henec the reason that there are fewer of the crystals every year. I know of many sold for the purpose of treating and cutting, sadly. Weight is 27 grams