Quite impressive with its big, variegated agate cabochon - I believe this is actually moss agate - and extremely rare this is a Mexican ring with strong presence by Enrique Ledesma, one of Taxco's foremost modernist silversmiths.
I love the asymmetrical setting - it creates a feeling of continuous flow and movement that accentuates the earthiness of the agate - and the fantastic way that Ledesma has of combining metal and stone.
The ring bears the Eagle 60 assay mark, which in Bille Hougart's, Little Book of Mexican Silver, is shown as only having been used by Ledesma (see p. 262 and also 92).
I firmly believe that this is indeed a Ledesma piece despite the fact that his signature is missing -
in addition to the Eagle the style, craftsmanship and materials used support the attribution.
The ring is a comfortable sz 6.25; its face is 1 1/16" by 13/16" and will rise 7/8" off the finger when worn. It weighs 10.9 grams and is signed "MEXICO 925", bears the Eagle 60 assay mark but no maker's mark. Dating in the 1960s-70s, it is in excellent vintage condition - a very rare find by the master of mod Mexican design.