: Many gems are heat-treated to enhance color (e.g., Aquamarine and Ruby). These treatments are generally permanent but can make stones more brittle.
: A broad category for all other stones, including Amethyst , Topaz , and Opal . Organic Gems : Non-minerals like Amber , Pearl , and Jet . The "4 Cs" of Gemstone Value GEMSTONES
: The presence of internal "inclusions" or surface blemishes. In colored gems, some inclusions are expected and can even help identify the stone. : Many gems are heat-treated to enhance color (e
: Beginners can start by observing luster , transparency , and hardness . Organic Gems : Non-minerals like Amber , Pearl , and Jet
Colour. Colour is the main feature of a gemstone, which exudes beauty and rarity. Gemstones need to possess three characteristics:
While the 4 Cs are famously used for diamonds, they apply differently to colored stones where is the most critical factor.