Victorian Natural Pearl & Diamond Cluster Ring

Antique engagement cluster ring in 18Kt yellow gold, adorned in its center with a button shaped natural pearl (diameter: 8.2mm approx), surrounded with old cut diamonds (estimated color H/I, estimated purity VS to SI).
Total weight of the diamonds is estimated for approximately 1.40 Cts.
Pearl accompanied by a certificate from the LFG (French Gemmology Laboratory) specifying natiral seawater pearl without indication of treatment.
19th Century work.
Gross weight: 4.45g
Finger size: 50 (diameter 16.00 / US 5.25).
Height of the pattern: 1.50 cm
Condition: slight micro scratches on the gold parts, slight worn of the setting, micro scratches and natural relief of the pearl, shock and slight loss on a diamond, see photos.