David Yurman 925 Sterling Silver Blue Topaz Ring with Diamonds. Wheaton Collection, 10 X 8mm in a size 7. Hallmark: DY 925 Comes with DY Pouch. Blue Topaz is known as the gemstone of love & loyalty. It represents eternal romance & friendship. The light blue color helps channel relaxing energies & fight off chaos & negative emotions. Blue Topaz promotes harmony & relaxation & can be especially helpful in healing hurt feelings & calming frayed nerves.