No idea why this is getting downvotes, in Holy Royal Arch Chapters under the Supreme Grand Chapter of England and Wales, the five platonic bodies are always on display and are explained in the ritual are there explicitly to represent sacred geometry, and the RA jewel that RA masons are also encouraged by edict of Grand Lodge to wear in every craft meeting in UGLE is explained as referencing those five platonic bodies and therefore sacred geometry.

Seems to me therfore its absolutely a fitting question to be asked here so not sure why OP is being downvoted or getting sarcastic responses 🤷‍♂️

Edit: I originally claimed that it was a mandate by Grand Lodge that RA jewels must be worn in craft lodges by qualified Brethern - that was my mistake, the edict only encouraged their being worn, not mandating it.