Oscar Master Jeweler, located at 130 E Prospect Ave, Danville, CA 94526, specializes in engagement ring creation and a variety of jewelry services. The jeweler has a reputation for custom design, drawing upon the owner's extensive experience in the jewelry arts. The phone number for inquiries is (925) 309-4122.

Operating hours are as follows:

| Day | Hours |
|-----------|--------------------|
| Monday | Closed |
| Tuesday | 11:00 AM - 6:30 PM |
| Wednesday | 11:00 AM - 6:30 PM |
| Thursday | 11:00 AM - 6:30 PM |
| Friday | 11:00 AM - 6:30 PM |
| Saturday | 11:00 AM - 6:30 PM |
| Sunday | Closed |

Overall Sentiment from Online Customer Reviews:
The reviews present a mixed atmosphere overall, with 33% positive, 0% neutral, and 67% negative sentiments. Some customers praised the quality of the jeweler's work, noting the beauty of custom pieces, while others reported issues with service and customer satisfaction.

Best Review:
Zack appreciated the assistance he received during the custom piece creation process, highlighting the jeweler's dedication and craftsmanship.

Worst Review:
Karen expressed frustration over service issues, mentioning the jeweler's refusal to honor a Yelp certificate despite being a long-time customer, which impacted her perception of the business.

*For this overview, customer feedbacks were viewed on Yelp, Google, and Facebook.