opály 4 [vynechat] ložiska opálov 3 [vynechat] spracovanie drahých kameňov 2 [vynechat] bane 1 [vynechat] baníctvo 1 [vynechat] dejiny 1 [vynechat] dejiny baníctva 1 [vynechat] dejiny metalurgie 1 [vynechat] deposits of raw materials 1 [vynechat] drahé kamene 1 [vynechat] genealógia 1 [vynechat] geography 1 [vynechat] history 1 [vynechat] history of metallurgy 1 [vynechat] history of mining 1 [vynechat] ložiská nerastných surovin 1 [vynechat] minerály 1 [vynechat] mines 1 [vynechat] mining 1 [vynechat] opals 1 [vynechat] podnikatelia 1 [vynechat] precious stones 1 [vynechat] vlastiveda 1 [vynechat] šľachtické rody 1 [vynechat] ťažba opálov 1 [vynechat]