7 x 5.5 x 4 cm (W x H x D), crystal size 1.5 x 1.0 cm, beautiful blue color. Location: Badakshan Afghanistan
7.5 x 6.5 x 0.5 cm (W x H x D) polished on both sides with beautiful grains Origin: Barahona Dominican Republic
6.5 x 5.5 x 0.5 cm (W x H x D) polished on both sides with beautiful grains Origin: Barahona Dominican Republic
8 x 4 x 0.8 cm (W x H x D) polished on both sides with beautiful grains Origin: Barahona Dominican Republic
7.5 x 7 x 5 cm (W x H x D) Location: Midingi Mine Katanga DR Congo
10 x 8 x 6 cm (W x H x D) Location: Midingi Mine Katanga DR Congo
9 x 7 x 4.5 cm (W x H x D) Location: Midingi Mine Katanga DR Congo
5 x 4.5 x 3 cm (W x H x D) Location: Midingi Mine Katanga DR Congo
11 x 10 x 4.5 cm (W x H x D) Location: Midingi Mine Katanga DR Congo
8 x 5 x 3 cm (W x H x D) dendrite opal, top grain Origin: Eskisehir Turkey, Dr Dirk U. Rottzoll collection