The Feature of Jewelry
The gemstone is a stone destined to become a precious gem.
- It has to be beautiful.
- It has to be hard and durable
- Being rare
Although it is said that there are 4000 or more kinds of minerals on the earth, only 100 kinds among these are considered jewelry stones. Their value varies depending on the variety. Some have high monetary value and are therefore called 'Precious stone' and others are of lower value and are therefore called 'Semi-precious stone'.
Precious stones are Diamond, Sapphire, Ruby, Emerald and Alexandrite.
In these four articles, we will explain the characteristics of gemstones in an easy-to-understand manner.
Reference: Kobutsu no fushigiga wakaru hon, Satoru Matsubara, Seibido, 2006.
The Importance of Chip Mounter Nozzles
Industrial applications of sapphire
Production of Sapphire
Jewel bearings: Adamant Namiki and the watch industry [Story of Watch 1]
Space Delivery Project: Return to Earth
Initial shipment launched
Scheduled to return to Earth
after 6 months of exposure to outer space
Cleavage of Jewel