Here're two comparison pics of mine. Sorry but I don't have Tomato.
Quite representative of the colours IRL
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Sang looks a tad orange-ish here.
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I feel that Ruby has blue undertones, making it look like a cooler red; while Sang has slight orange undertones, which make it seem like a warmer red. Tomato is not exactly red, and appears more orange-pink to me. But I've only seen it under artificial lighting in a restaurant, so I can't really judge accurately.
Wow thanks loads for the comparison pics! That certainly helps a lot and I think its ruby that I want! You own so many reds!

