Do 28 and 31mm gold Rolex datejust’s exist new?

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I was in Las Vegas last week and was offered 28 size in two stores. One store had 2 available in Cesar’s Palace with diamonds on the bezel too. The other was in the Wynn.
I tried all stores in Vegas before finally getting offered a 36 in the Crystal - I prefer larger sizes on me.
Were they all gold?
 
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