Those Victorians loved the symbolism of floriography, often using flowers and leaves as motifs to express love or longing. 
The ivy leaf is said to represent everlasting love and fidelity because of it's ability to cling to trees and walls. "I cling to thee" 
This cufflink conversion is in a rich, slightly rosy 15ct gold, engraved with a single ivy leaf and set with an old cut diamond.
Tested as 15ct gold 
Weight approx 1.10g 
Total drop approx 22mm
Width approx 12mm
Excellent antique condition