sapphire
n. countable B2 Upper Intermediate US //ˈsæfaɪɝ// UK //sˈæfaɪə// sap·phire
n. a precious stone that is usually a bright, deep blue. It is very hard and often used in expensive jewelry like rings.
n. a precious gemstone consisting of a transparent blue variety of corundum. While most commonly associated with a deep blue hue, it can occur in other colors except red.
She wore a beautiful sapphire ring on her finger.
The jeweler explained that the sapphire's value depends on its clarity and the richness of its blue color.
The crown jewels are adorned with several large sapphires, each meticulously cut to catch the light and emphasize their natural brilliance.
Usage
Countable when referring to the individual stone; often used as a modifier before another noun ('sapphire earrings').