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acid alloy alumina aluminum amount anvil apparatus assembly autoclave axis boron boule cabochon carbide carbon carbonaceous carbonaceous material catalyst catalyst metal catalyst-solvent charge chatoyant chromium cobalt color compound compression comprises container cooling corundum crucible cylinder density described diameter diamond crystals diamond growth diamond seed crystals disc electrical electrical insulation electrodes employed Example flame flux garnet gaskets gemstone graphite heater heating high pressure hydrogen insulating kbar layer lead oxide medium melting point metal oxide method mixture molten nickel niobium nondiamond nutrient oxygen piston plate portion powder preferably pressure and temperature pressure chamber produced punches pyrophyllite quartz range reaction chamber reaction vessel refractive refractive index ring rutile sapphire seed crystal shown in Figure single crystal solution solvent steel stone strontium titanate substantially suitable surface synthetic tantalum temperature and pressure thickness TiO2 tion titanium tube tungsten U.S. Patent weight yttrium zirconium dioxide zone