Уважаемые знатоки,
вот, что мне написали в одной из лабораторий где я показывал этот образец:
Spezies * Espece * Spices: Natural Corundum
Varietat * Variete * Variety: Ruby
Dewicht * Poids * Weight: 2650 grams
Schliff * Taille * Cut: Nil facets grinded
Form * Forme * Shape: Natural shape
Abmessungen * Dimensions * Measurements: 185 x 155 x 85 mm
Fabre * Couleur * Colour: Red
Bemerkungen * Commentaries * Comments: Quality estimation (G.I.A.)
Gem Color-hue: RP/PR
Tone: 5M
Saturation: 4-Mst
Luminescence SW: Medium red 253.7 nm
The gemstone represents three different kinds of crystallization. The top part partially consists of transparent plates. The bottom part partially consists of dipermental crystals of chrisoberyl with alexandrite effect of color-change from green to purplish-red with a reverser of 90%, such crystals are going deep into the gemstone and are of the diameter of 5 to 15 mm. The stone has zones of red, dark blue, yellow, orange, pink, green color, as well as colorless parts.