It is common knowledge that natural gemstones cannot be bought at a cheap price because they are unique and have high value but you should know that every gemstone has a different value thus a different price so it is possible that the gemstone that you like might not break you. You can get more information about gemstones and their prices from online websites or shops that sell gemstones but let us talk about the points that you should know before you actually buy a gemstone.
Of course, you would look into how pretty the gemstone is before you purchase it. People generally buy gemstones if they are fixed in some kind of jewelry and everyone wants beautiful jewelry but aesthetics is much more than that. You would need to look at the color, transparency, luster and symmetry of the stone as that will determine its real value and its price. If you want a truly valuable stone then make sure that it is aesthetically perfect.
Durability is another factor that determines the worth of a gemstone because if a gemstone is not durable, it is useless but luckily for everyone, natural gemstones are pretty durable. If you want to determine the durability of a gemstone, you would need to know its toughness, hardness and stability as all of them are strong indicators of its worth.
You should know that the origin of the gemstone matters a lot. Many gemstone enthusiasts do not agree with this but the fact is that the country that the gemstone is sourced from determines the price that it sells in the market. It should also be noted that a famous gemstone producing country would always produce the best quality gemstone and lesser known countries can produce amazing quality gemstones.