An emerald is a precious stone.
The term 'Semi-precious gemstone' is an old one that referred to any gem that is not diamond, ruby, sapphire or emerald. In modern times, this distinction does not reflect a gemstone's value, some semi-precious stones can be worth more than precious ones.
Diamonds used in jewelry are Precious. other diamonds are not even semi-precious
Moderately. And that depends on the quality of the stone. They are semi-precious stones- not as expensive as diamond, ruby, emerald, but not costume jewelry either.
diamond or emerald
5 precious stones I know are the Diamond, Ruby, Emerald, Sapphire, and Opal.
Precious is a judgement and you are the judge. Individually, each gemstone is valued monetarily on its own merits; precious includes sentiment.
emerald,ruby,sapphire,diamond,pearl,opal
Diamond ruby Sapphire Emerald Aquamarine spinel tourmaline etc
Gravel. I don't agree. Precious stones are Jewels: Diamond, Ruby, etc. "Semi-precious" refers to Jade, Opal, Turquoise, etc.
Semi-precious
Rubies are traditionally classified as "precious", not "semi-precious".
Amethyst, Topaz, Ruby, Sapphire and Emerald. I'm not sure if there are any more. Feel free to add any more.