Translation: "Virtue is like a rich stone, best plain set"

Francis Bacon's Of Beauty has "Virtue is like a rich stone, best plain set". What is exactly "best plain set"? According to leonAzul on this page, it means, best if placed against or in front of a plain setting or background. Hence my translation:

品德犹如宝石，于平实的衬底前最优

水天同, perhaps the best Chinese translator of Francis Bacon's works, has the same understanding, with this translation:

才德有如宝石，最好是用素净的东西镶嵌

compared to others'

德行犹如宝石，朴素最美  <-- Not right
善犹如宝石，以镶嵌自然为美  <-- Correct
美德好比宝石，在幽暗背景的衬托下反而更显名贵  <-- Over-"translated"; where's 幽暗?

(The above Chinese translations are collected at fang's BLOG.)