4.5 x 4.2 x 4.0 cm (Specimen); 0.65 carats; 4.75 mm x 4.17 mm (Gem) - Dioptase from Tsumeb is one of the most well known entities in the mineral world, and is considered to be one of the most desirable species for collectors in fine specimens. The specimen in this set features classic, sharp, emerald green trigonal crystals with good luster sitting on silvery Calcite on matrix. The largest crystal measures 1.2 cm. The accompanying gem is a really impressive little stone with superb color and clarity, and a traditional "Emerald" cut. With the naked eye, I can't see any notable inclusionsions in the stone, for that reason it's a very worthwhile pickup for anybody who collects this kind of material.