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.

If the quartz can’t scratch the specimen, it might be beryl or corundum, which are harder than quartz.

From Scientific American • Sep. 3, 2021

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

Diamonds are a 10 and almost four times harder than corundum.

From BusinessWeek • May 31, 2011

The corundum stone used by the Hindoos and Chinese is composed of corundum powdered, two parts; lac resin, one part.

From Inventions in the Century by Doolittle, William Henry