A diamond (tw si) set in 14 ct rich yellow gold. The diamond has a diameter of 3,5mm(0.16ct), 4mm(0,25ct) or 5.1mm (0.5ct). The wire is wildly twisted. 
 
The "tw" stands for Top Wesselton and evaluates the color of the diamond. Diamonds with Top Wesselton are  are almost colorless.
The "Si" stands for Small Inclusions. As an expert, small inclusions can be seen here under 10x magnification, impossible to see any with the eyes. An official certificate of the GIA (Gemological Institute of America) is included.
 
The jewelry is handcrafted, delivery time is 1-3 weeks