How are jade and jadeite graded (texture, water, color)? Where to buy and appraise in Taiwan?

Jadeite is graded by texture, water clarity, color, craftsmanship, and clarity; grade differences dramatically affect value, and identification requires expertise. This site lists jade, jadeite, and carving dealers by region with neutral data. Request certification from reputable institutions and seek third-party appraisal. This page does not constitute investment advice.