推荐回答（5个）
和田玉，把玩一段时间后，会有润度与油脂感加强的现象，也就是变色。
有些玉石质地疏松，容易变黄变黑，比如说和田玉中的俄料就是如此，因为它结构粗糙，盘玩佩戴久了，自然会慢慢变黄。所以这种需要我们在选择玉石时，尽管选购新疆的和田籽玉，因为它性质相对比较稳定，不易受到外界环境影响。
还有就是玉石的氧化作用，和田玉中或多或少会含有铁元素，这些元素在与空气接触过程中，这种铁离子与发生氧化作用，形成氧化铁，玉石的颜色也会呈现出氧化铁的黄色。尤其是山料和田玉，因为开采出来后切开后才开始接触空气，氧化得也就更快了。
扩展资料：
真正的玉石性质比较稳定，颜色一般不会发生很大变化。但是白玉变色是和田玉中最明显的，很多白玉把玩的时间久了都会发黄变黑，这是由错误的保养方法导致的。
人体分泌的汗液腐蚀了玉的表面等等，如果长期不清洁，也会让和田白玉慢慢变黄发黑，降低其品质。要防范这一点，就需要我们及时保持玉面干净，多拿清水清洗后，拿刷子把缝隙处的灰尘和油脂刷干净。还要注意最好不要将和田玉贴在脸面或鼻尖，因为这些部位的油脂最多。
参考资料：人民网-和田玉收藏存在三大误区
参考资料：百度百科-和田玉
和田玉变色，最明显的莫过于白玉，很多人的白玉久了都是发黄变黑，最大原因便是错误的保养方法，比如说不爱干净，盘玩前不洗手，增加玉石受到污染，或用玉石去蹭脸部或鼻尖的油脂，这非但不是对玉的油养，反而加重它的污染。
和田玉会变色也不总是向坏的方向发展，有些玉石经过妥善的保养及盘玩之后，颜色会更为均匀细腻，仿佛从青涩变得成熟。
还有可能是玉石颜色本就是染色而成，不能保持长久，在佩戴中美丽的颜色会慢慢消失，呈现出染色之前的色彩，对于这种玉石，应该在选购时，便区别开来，经过染色的玉料本就没有什么价值。生活中，空气里的灰尘、人体分泌的皮屑油脂，及不小心沾上污染物，如果不及时处理，这些物质或腐蚀玉石表面，导致光彩暗淡，或沁入玉石内部，使得色彩中杂质增多而变得不堪。对于这种玉石变色，其实是可控的，如果我们细心保养，玉石的颜色应该不会变坏的。
会变颜色,传说有灵性的玉吸收人的阳气和灵气;还可以从玉中看出佩戴人的健康与病理o
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