
Sign up to save your podcasts
Or


Nathan Renfro, senior manager of colored stones at the GIA, discusses treatments, synthetics, gemstone origin, and what attracts consumers to rubies, sapphires and emeralds. Plus: How the cookie monster appeared in an agate.
By Rapaport3.2
1818 ratings
Nathan Renfro, senior manager of colored stones at the GIA, discusses treatments, synthetics, gemstone origin, and what attracts consumers to rubies, sapphires and emeralds. Plus: How the cookie monster appeared in an agate.

30,698 Listeners

1,980 Listeners

14,983 Listeners

30,216 Listeners

3,998 Listeners

2,869 Listeners

50 Listeners

6 Listeners

367 Listeners

26 Listeners

15,345 Listeners

49 Listeners

3,831 Listeners

799 Listeners

104 Listeners