Love and loyalty are fragile and short-lived. Just like the paperweight which represents them, they are shattered to bits by the thought police. Their love, represented by the coral centerpiece, is out in the open--fully observable and obvious through the clear glass which surrounds it. Their loyalty is only intact as long as the paperweight is...after being caught and subjected to Room 101, loyalty falls quickly and without anything other than the threat of Winston's and Julia's greatest fear. THe fear needs not be carried out...the threat of it alone is enough to demolish the fragile thread of loyalty between them.