In general, adding diamonds or other precious stones to a watch can increase its value, but it depends on several factors such as the quality and size of the stones, the type of watch, and the overall design. 

If the watch is a high-end luxury brand and the diamonds are of high quality, the added value may be significant. However, if the watch is a lower-end brand or the diamonds are of poor quality, the added value may be minimal or even decrease the overall value of the watch.

It's also important to note that any modifications made to the watch, including adding diamonds, may affect its originality and authenticity, which can impact its value in the eyes of collectors and enthusiasts.

Ultimately, the value of a watch with added diamonds or other precious stones will depend on a variety of factors, including the quality and type of stones, the brand and model of the watch, and the overall condition and originality of the piece.

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