Jewels simultaneously signal distance and favor for vanity's sake. [causal]
By virtue of their material, jewels signify, in one and the same act, an increase in distance and a favor. For this reason, they are of such particular service to vanity which needs others in order to despise them.
XREF: Connects to sociological analyses of luxury goods and Veblen's conspicuous consumption.
Georg Simmel, The Sociology of Georg Simm…, loc. 8290