18kt gold vermeil Fifi tiny button diamond necklace from MONICA VINADER featuring round cut diamonds, delicate chain, lobster claw fastening and adjustable fit. Every handcrafted Monica Vinader piece comes with a five-year warranty.. Conscious: We've partnered with Good On You – an ethical agency that rates how sustainably brands perform. This item comes from a brand that performs well in relation to their impact on the planet..