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synthetic ruby


The Verneuil process, also called flame fusion, was the first commercially successful method of manufacturing synthetic gemstones, developed in 1902 by the French chemist Auguste Verneuil.

ring


sound loudly and sonorously; "the bells rang"


Each of a series of resonant or vibrating sounds signaling an incoming telephone call


A telephone call


An act of causing a bell to sound, or the resonant sound caused by this


a characteristic sound; "it has the ring of sincerity"


a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"