I second your suspicion for the ruby dial. The problem with the Tridors is that both WG and YG dial are possible although the reference number is a WG-one that ends with a 9. The same for the bezel. It can be YG and also (but rarer) WG afaik.
As an example this bi-color (not Tridor) 18349 with Lozange (YG) dial and bi-color bracelet:
https://www.monacolegendauctions.com...ces-22/lot-259
Sold for 117k in 2020.
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♛16018 purple roman / ♛16710 sel faded / ♛18038 ruby baguette / ♛18238 myriad gray / ♛18248 blue roman / ♛18248 stick champagne / ♛18349BIC stick white / ♛116505 ivory
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