Precious is a judgement and you are the judge.
Individually, each gemstone is valued monetarily on its own merits; precious includes sentiment.
Topaz is its own gemstone, just like and emerald and a diamond. Crystal is something else though.
Diamond is the hardest mineral known.
A radiant cut diamond is a diamond cut invented in 1977 by Henry Grossbard that infuses the rectangualar or square shape of an emerald cut diamond with the brilliance of a round diamond.
Platinum
Probably a red diamond, since it is the most rare natural colour.
An emerald is a precious stone.
diamond or emerald
5 precious stones I know are the Diamond, Ruby, Emerald, Sapphire, and Opal.
The Ruby is more expensive.
"Most precious" is relative. To someone who has received a diamond as a gift from a loved one, that may be the most precious.
Diamond itself.
emerald,ruby,sapphire,diamond,pearl,opal
Diamond ruby Sapphire Emerald Aquamarine spinel tourmaline etc
Yes, an emerald is considered a precious stone.
Yes, a diamond is a precious gemstone.
The most obvious is the diamond
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.