Q: Where do diamonds come from?
A: Mostly Central and South Africa, but also from other parts of the world. On the world map in our polishing room, you will find a detailed view of countries where diamonds are extracted.

Q: How do you polish a diamond, the hardest natural product of the world?
A: Polishing takes place cast iron discs. To polish facets into the diamond, it is necessary to coat the disk with diamond powder and olive oil.

Q: What is a conflict diamond (blood diamond)?
A: A conflict (Blood) diamond) is a stone extracted in an area of Africa controlled by military forces in rebellion against legitimate governments. The proceeds of these stones are used to fund wars. Coster Diamonds abhors the toll payed by conflict diamonds and has a zero tolerance policy towards them.

Q: What is the largest diamond ever found?
A: The Cullinan Diamond found in South Africa (3106 ct). The replica of the diamond is displayed in the polishing area of our factory.

Q: How do I take care of my diamonds? How do I keep my diamont beautiful
A: Place your diamond jewelry in hot water mixed with ammonia (3:1) and leave it for circa 20 minutes. A toothbrush soaked in alcohol will be sufficient to remove soap, dust and dirt. Please contact our sale staff for more information.