https://www.blackhillsgoldsource.com/product/gold-family-ring-with-organic-swirling-vines-and-2-genuine-birthstones/
Gold Family Ring with Organic Swirling Vines and 2 Genuine BirthstonesG C1470-2-GN
Black Hills Gold family ring with organic swirling vines set with two genuine 2.5mm round birthstones and two 12 karat gold rose and green leaves.
https://store.astm.org/c1470-06.html
C1470 Standard Guide for Testing the Thermal Properties of Advanced Ceramics
standard guidefor testingthe thermal