Colored Stone + Diamond Views

With the world economy in flamefusion-flux-hydrothermal-high pressure high temperature mode, and the diamond (colored stone industry = amorphous) industry debt in US$12 billion +/-, I have always wondered why there are no IPOs in diamond/colored stone trade, a method used by many businesses to raise capital to compete in the global market + my guess is, the diamond/colored stone trade would be petrified of detailed financial information disclosure and the risk factor, especially in today's volatile economic environment.