This shape is very slim, and has a little facet around the edge. You can leave that facet crisp, and fire polish sparingly, or you can go a bit longer an fire polish the facets into a soft rounded edge, giving the soft sea glass feel to the edge.
The various shapes are available in the following sizes:
Duo with Square
Duo with Round
Duo with Hex
Duo with Triangle
Trios Measure: Mini 13mm x 6mm, Small 15mm x 6.5mm, Medium 18mm x 7mm