Allotropes of carbon dispersion of light of diamond make it useful for both industrial applications and jewelry. Diamond is the hardest known natural mineral. This makes it an excellent abrasive and makes it hold polish and luster extremely well. No known naturally occurring substance can cut (or even scratch) a diamond, except another diamond. The market for industrial-grade diamonds operates much differently from its gem-grade counterpart. Industrial diamonds are valued mostly for their hardness and heat conductivity, making many of the gemological characteristics of diamond, including clarity and color, mostly irrelevant. This helps explain why 80% of mined diamonds (equal to about 100
Education sector responses to substance abuse or supporting resilient mental health or acquiring life or academic skills. Curriculum aiming to prevent substance use before the typical age of first use within the school system is directed at children who are around 6–12 years old. The typical age of first use of any substance will vary according to the national or local situation. Prevention education curriculum during this period is centred on what is referred to as ‘skills-based health education’. It aims to develop key personal and social skills such as those that support healthy emotional and social development during this period, and protect against later substance