Encompassing three famous Jade Eras (Hongshan,Liangzhu and Han) this is indeed a precious String of Preciousness(Duo Bao Chuan).
The first is a Pig Dragon(Zhulong) from the Hongshan Culture of north east China in Liaoning.
The second is a Liangzhu Culture Jade Bead which originally may have been part of a necklace but now is a part of this String of Preciousness.
The third is a Chicken Bone White (jigubai) Scholar/Officer from the Han Dynasty of China.Carved in simple minimalistic form using the Han Ba Doa famous during that period.
Spanning three thousand years of China' history in an incredible String of Preciousness.