newbee qns on datejust 31mm

[seacoconut]

hi, I am new to branded watch... am thinking of getting a gift to my wife, and is thinking about a rolex... I saw in Cortina in raffles city, and sw that there is a range call datejust 31 mm...

what is the model number for this range so that I can look at the price list in this forum...

many thanks for helps... and any kind advice on which shop provide good service and reasonable price? and what are the popular model for lady?