corundum
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Diamond defines a hardness of 10 and is actually about four times harder than corundum, which is 9.
From Textbooks ● Jan. 1, 2017
The Bronco mane and eyeball were created from orange sapphires while the head features pave-set diamonds and custom-cut corundum blue stone.
From Washington Times ● Jun. 12, 2016
Some of these minerals may very well be our very own corundum, with its trace elements.
From Scientific American ● Apr. 14, 2012
Rubies and sapphires, which are both made of the same mineral, corundum, are “quite durable,” according to John Watkins, an independent goldsmith in Lake Nacimiento, California.
From BusinessWeek ● May 31, 2011
The Eastern nations have used corundum for this purpose for ages.
From Inventions in the Century by Doolittle, William Henry
