December's birthstones offer three ways to fight the winter blues: tanzanite, zircon, and turquoise—all of them are best known for beautiful shades of blue.
With Accredited Gem Lab
Offers AGS Labs Diamond Grading Reports
AGS Certified Members:
- Elisa Olufson, CGA
- Kendra Wollert, CG
Address: 215 SW 2nd St, Corvallis, OR 97333-4633
Phone: (541) 738-6005