gold-tone 18K gold vermeil diamond embellishment lab-grown diamond pear-cut round-cut square-cut 0.5 carats lobster claw fastening Every handcrafted Monica Vinader piece comes with a five-year warranty. Complimentary engraving at any Monica Vinader store, for a layer of personalisation. Normal everyday use and external agents may reduce the lustre of gemstones and gold surfaces. To maintain, use specific, non-abrasive products specially meant for cleaning jewellery.