Logo Design (Bull Lumario Limitada)

BULL LUMARIO

Bull Lumario Limitada is a new, completely legal and registered company In Tete, Mozambique. We have a license to buy, sell and export gold and rough or cut gemstones (except Diamonds) covering 5 provinces in the country. The company is made up of myself, Stuart Bull, an Australian geologist and a Mozambican partner, Jose Lumario. Between us we have extensive experience in the gemstone business.

We will be targeting a world wide internet audience of buyers in the near future but our audience on the ground will be mostly expats from all over the planet (potential buyers) and also Portuguese speaking Mozambicans, who will make up the bulk of the people we are buying products from.

We require a logo design to represent our business, but unfortunately have no preconceived ideas as to what the design should be other than the company name being included (Bull Lumario). I hope that adds to the creative juices for the designers who really have a clean slate to go with.
I suppose I should point out that we really don't want to draw undue attention to ourselves by having the obvious "faceted Diamond" or "gold bullion bar" as part of the design. That could prove to be dangerous in this part of the world. There is also no need to have any references to Africa but we are not against the idea if someone comes up with something smart. The colours could involve the same as the Mozambican flag (yellow, red, green, black and white) but again this is only an idea. As the company is registered in Tete, Mozambique on the banks of the Zambeze River, there may be reference to rivers or maybe even to the "Southern Cross" but again I am only trying to toss some ideas in the air and again this is not a requirement.
The design should be fairly simple to allow adaptation to company stamps etc.
We are really hoping the designers will use their creative talents to guide us on the design and are hoping for a broad range of ideas that we can help refine when the designs start to appear.