Natural Moonstone from Madagascar, untreated and authentic. This 4.99-carat oval gemstone displays a captivating rainbow adularescence with faceted precision. Measuring 13.3 x 9.9 x 6.7 mm, it offers excellent size for jewelry design. Slightly included clarity is natural for moonstone and does not diminish its luminous play of light. A premium choice for collectors and artisan jewelers seeking genuine, untreated moonstone with distinctive optical properties.