The South China Morning Post writes that the diamond cartel is reacting badly to the arrival of large, good, lab-grown diamonds [scmp.com]. The synthetics challenge the widely-promoted assertion that diamond prices only go up. However, labs are now able to produce chemically identical gem-quality stones, indistinguishable by the naked eye from mined diamonds, in quantities pushing 200k carats of diamonds per month. Synthetic diamonds still only account for %1 of rough diamond sales globally, but that is expected to expand to between 7.5% to 15% by 2020.