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https://www.gemsociety.org/article/hardness-and-wearability/
A 7 or higher on the Mohs scale usually indicates a gem is hard enough for normal jewelry use. This is a guideline, not a hard and fast rule. Pearls and opals are some of the most popular jewelry gems but are well below 7. Wearability can be graded as Excellent, Very Good, Good, Poor, or Display Only.
https://www.gemselect.com/gem-info/gem-hardness-info.php
Jul 05, 2019 · Gemstone Hardness is a measure of how difficult (or easy) it is to scratch the surface of the gemstone. The hardest gemstones (diamonds, rubies and sapphires) get a rating closer to 10 on the Mohs scale, while the softer gemstones (amber, chrysocolla and pearl) are placed closer to 1 (see the entire Mohs index below).
https://www.gemsociety.org/gemstone-encyclopedia/
Traditionally, precious stones were the Big Four gemstones — diamonds, emeralds, rubies, and sapphires. Semi-precious stones were everything else. Today, gemologists don’t use these terms because they imply that some gems are better or worth more than others.
https://aovcrystals.com/blogs/news/15-blue-gemstones-used-in-jewelry-with-details-and-pictures
Amethyst comes with a rating of 7 on the Mohs scale of hardness so it is the great stone used for making all forms of jewelry including earrings, necklaces, rings, pendants, and bracelets. Being very abundant in nature, this crystal is often heat-treated and used for producing citrine and green quartz.
https://www.macmillandictionary.com/us/thesaurus-category/american/stones-used-in-jewelry
diamond. noun. a very hard clear colorless stone used in expensive jewelry and for cutting hard objects.
https://quizlet.com/subject/test-history-ancient-china-chapter-6/
a farmer with a small farm. (551-479 BC) Chinese philosopher, he was the most influential…. jade. a hard gemstone often used in jewelry. oracle. a prediction by a wise person, or a person who makes a predict…. 27 terms. leefrancis1984. World History Ancient Chapter 6 China.
https://sedagems.com/blog/gemstone-information/blue-gemstones-used-jewelry/
Jan 24, 2018 · Sapphire. The Sapphire is one of the four most valuable stones in the world – so if you own one of these you are incredibly lucky indeed. Sapphires sparkle a glittering deep blue that is unrivalled in the gem world. It is also a very hard and durable gem making it the perfect choice for Jewelry. SHOP SAPPHIRE.
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