As for whether it has real diamonds, the "417" marking only tells you about the gold content. It does not indicate whether any diamonds (or other gemstones) are real or not.
To determine if the diamonds are real, you'll need to:
* Look for a diamond grading report: If the ring came with a grading report from a reputable gemological lab (like GIA, AGS, or IGI), it will state whether the diamonds are natural or synthetic.
* Inspect the diamonds: Use a jeweler's loupe to look for inclusions (tiny imperfections within the diamond). Most natural diamonds have some inclusions, while lab-grown diamonds often have fewer.
* Consult a jeweler: A professional jeweler can examine the diamonds and tell you whether they are real or not, and provide other important details.
* Consider the price: If the ring was very inexpensive, it's more likely that the diamonds are not real.