Jonathan K. & Co. Fine Jewelry offers a unique and personalized experience for those seeking custom engagement rings in Sacramento County. Known for their exceptional craftsmanship, the store specializes in custom designs, ensuring each piece reflects the client's vision and style. The owner, Jonathan Kozycz, along with his knowledgeable staff, provides exceptional customer service, guiding clients throughout the entire process, from selecting the perfect diamond to the final design of their ring.

The jewelry store is located at 535 Fulton Ave Ste 2, Sacramento, CA 95825, and can be reached at (916) 485-5353. Operating hours are as follows:

| Day | Hours |
|-----------|------------------|
| Monday | Closed |
| Tuesday | 10:00 AM - 6:00 PM |
| Wednesday | 10:00 AM - 6:00 PM |
| Thursday | 10:00 AM - 6:00 PM |
| Friday | 10:00 AM - 6:00 PM |
| Saturday | 10:00 AM - 4:00 PM |
| Sunday | Closed |

Overall Sentiment from Online Customer Reviews:
Customer feedback reflects an overwhelmingly positive sentiment, with approximately 90% of reviews highlighting satisfaction pertaining to both the customer service and the quality of custom engagement rings designed by Jonathan K. & Co. About 8% remain neutral, while the negative experiences account for about 2%.

Best Review: A customer praised Jonathan K. & Co. for the stunning craftsmanship of a custom ring created from their late husband's gems, noting the dedication and skill shown in crafting a meaningful piece that captured both past memories and future hopes.

Worst Review: A review expressed concern over an unsettling experience involving a security guard outside the store, which made the customer feel uncomfortable during their visit, despite having a positive view of the jewelry services offered.

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