초록 ▼

Synthetic gemstones having extraordinary brilliance and hardness are formed from large single crystals of relatively low impurity, translucent silicon carbide of a single polytype that are grown in a furnace sublimation system. The crystals are cut into rough gemstones that are thereafter fashioned

Synthetic gemstones having extraordinary brilliance and hardness are formed from large single crystals of relatively low impurity, translucent silicon carbide of a single polytype that are grown in a furnace sublimation system. The crystals are cut into rough gemstones that are thereafter fashioned into finished gemstones. A wide range of colors and shades is available by selective doping of the crystal during growth. A colorless gemstone is produced by growing the crystal undoped in a system substantially free of unwanted impurity atoms.

대표청구항 ▼

[ That which is claimed is:] [1.] A method of producing a finished gemstone having a Mohs hardness of approximately 8.5-9.25, a density (SG) of approximately 3.2, and a refractive index of approximately 2.50-2.71, said method comprising the steps of:growing a single crystal of a single polytype of s

[ That which is claimed is:] [1.] A method of producing a finished gemstone having a Mohs hardness of approximately 8.5-9.25, a density (SG) of approximately 3.2, and a refractive index of approximately 2.50-2.71, said method comprising the steps of:growing a single crystal of a single polytype of silicon carbide of a desired color character; andfaceting and polishing the silicon carbide crystal into a finished gemstone.