Highest Quality Jade/Jadeite Jewelry. This Item is Guaranteed Jade from the Country of Burma. Jadeite, the rarest and most valuable form of jade, is also known as 'Burmese Jade', (after its traditional and still most important source - Burma). It has been in wide use only since the mid-18th century, and today is considered the 'precious' form of jade. Most 'fine jewelry' items of jade consist of jadeite. Jadeite exhibits a wide palette of sometimes vibrant colors, often with translucence. Green is the most valuable color; in particular, a translucent emerald-green is the most prized of all, and is sometimes called 'Imperial Green'. Jadeite is also available in lavender, red, yellow, black and white.