OK, please forgive me in advance, because this is my pet issue for some bizarro reason.
Any purchase of any diamond fuels the diamond supply. The Kimberley process is total crap, and is so easily faked that it's a huge joke. "Canadian" diamonds are also a huge joke. I truly believe that wearing a diamond is morally wrong, and if you want to wear a diamond, fine; however, you must be willing to admit that you are part of the whole "developed" world that feeds off of third world misery and poverty.
Diamond mining has raped the African continent since Cecil Rhodes first got his greedy hands on his first rock. Period. End of story. For someone to legitimately believe that the African diamond trade is any good is total rubbish. That's like when the UN soldiers are accused of sex crimes for having sex with 5 year old prostitutes using the defense of: "well, they were willing, too." Shame on you.
I don't live in a region of Africa where there are diamonds, thank God; however, in all my international studies and travels, this is the one issue I see no grey area in. You buy a diamond, you are on the demand side of the economic equation which continues to foment issurection and violence in the poorest regions of the world.
OK. Rant over. I try to keep this to myself, because my strong views tend to offend people who ignorantly wear diamonds, but the more I live and travel in Africa, the harder it is to just keep my mouth shut.
I'm assuming that you mean that: purchasing a diamond means a participation in the demand of diamond, which fuels the diamond supply.
I will argue this point from an Economics perspective.
If you may recall from ECON 101, demand does not "fuel" supply. They are two separate analysis. Demand is the behavioral analysis of consumers and supply is the behavioral analysis of producers. Supply does not change because demand changes. If one changes because of the other, the theory would not serve its purpose because its purpose is to explain the equilbrium price of an exchanged object in a market. To make this assertion clearer: with a perfectly inelastic supply (where Quantity Supplied does not change with the changes in price), if demand increases, equilibrium price would increase. However, supply will not change due to change in demand. This is the same with an elastic supply, if demand increases, equilibrium price will increase. However, SUPPLY will not change. QUANTITY Supplied will incease depending on the elasticity of supply.
I agree with most ladies here. The issue is not black and white. You cannot say simply that because you buy a diamond, you are a part of its demand, and thus fueling the supply, and thus you are supporting violence. Why are diamonds actually used for those purposes? Why not other things? From an economics perspective, it is due to the high equilibrium price of diamonds. If the equilibrium price of diamonds is low like that of water, for example, it would definitely not even be considered to be used for dirty purposes. So, if the goal is to stop the use of diamonds for such purposes, the key, again from an economics perspective, is to change the equilibrium price of diamonds. How can that be achived? Changing supply, changing demand, change the elasticity of supply or demand. How can these be achieved? Supply: release all the diamond reserves now. Demand: like the one that you said make everyone stop buying diamonds. These would drive equilibrium prices down and diamonds would be worthless for its purposes. However, these would be unrealistic since companies like DeBeers are too greedy and consumers will NOT stop buying diamonds, otherwise, basically a lot of other commodites, would also have no consumers by now. It's like saying that we all need to stop using fossil fuel to stop global warming. Also, how do we know that the supply of diamond is not or close to pefectly elastic, where price will not change even if demand changes drastically.
Let's think about this, how can we say that consumers and not produces are to be blamed for the high equilibrium price of diamonds, which is used for dirty purposes? Answer: you can't! Basic supply and demand will NOT be able to tell you that consumers are to blame and thus consumers cannot be burdened to correct the damages that have been done by boycotting diamonds. It could be demand, supply, or both working together. Thus, how do we know which one needs to change? Or is it both?
Thus, a new model needs to be used for your argument and as another lady pointed out, we would love to see it. Supply and demand is just simply to broad to support this perplexing situation. There are too many possibilities in the diagram that, as I'm sure you've learned, is often the poorest model to explain situations especially with moral concerns.
I don't like arguing unless I can support it well, especially in a public forum. However, I'm fairly certain of what I've written because coincidentally, this topic was a case study in my ECON 101 class

P.S. I probably will read what I've written again tomorrow and find many mistakes because this is written late and I'm quite tired. Thus, I apologize in advance.