Quizzes map. Ruby Quiz: questions and answers
Quiz
Ruby Quiz: questions and answersQuestions
- What is a ruby?
- What is the name of the world's most valuable ruby?
- Ruby is the birthstone for _____
- What is the ruby's crystal system?
- According to the Mohs scale of mineral hardness, what is the hardness of the rubies?
- What is the color of ruby?
- When were the first synthetic rubies invented?
- In how many steps is the treatment of lead glass filling to the ruby?
- Under what criteria are rubies classified?
- What is the only country in mainland Europe to have naturally occurring rubies?