Genderwomens gemstoneopal length of earringsinch078approx2cm width of earringsinch078approx2cm jewelry typehoop earrings drop earrings stud earrings occasionparty business wedding bikini thank you beach graduation christmas gifts congratulations halloween housewarming office career birthday outdoor anniversary special occasion sports gift casual engagement daily valentine materialalloy opal shapeheart cut jewelry stylebohemian british double sided vintage usa mul