: Most gems can be cleaned with mild soap and water. However, porous stones like Opal and Pearl require specialized care to avoid damage. Gemstone Buying Guide - Gemfields
Colour. Colour is the main feature of a gemstone, which exudes beauty and rarity. Gemstones need to possess three characteristics: GEMSTONES
: The presence of internal "inclusions" or surface blemishes. In colored gems, some inclusions are expected and can even help identify the stone. : Most gems can be cleaned with mild soap and water