Asss
Not all minerals are gemstones; these are exceptions.
The most valuable gemstones are the clear, crystalline form of the harder minerals such as diamond, corundum, tourmaline, topaz, and garnet. Other minerals with exceptional clarity or color, and even some rock types are known commercially to be valuable as gemstones, but hardness is a key to frequent wearability.
minerals
Gemstones are minerals but not all minerals are gemstones, as some minerals are very common and have little aesthetic or monetary value.
No not all. Some minerals are metals.
yes they are all minerals and gemstones
minerals
heat and pressure
No not all. Some minerals are metals.
The color of rocks is determined by which minerals make up the rocks. Red minerals like iron-containing hematite would make a red colored rock and sulfur containing minerals would make yellow.
no becase there others name
Yellow gemstones: yellow sapphire, yellow beryl, citrine, yellow chrysoberyl, spessartite garnet, yellow zircon, and etc.