Sorry, there's no way to ID a pill without an imprint. All Rx and OTC drugs in the US are required by the FDA to have an imprint, otherwise it could be a vitamin, herbal, energy, diet, foreign or illicit.
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Drugs.com provides accurate and independent information on more than 24,000 prescription drugs, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. Data sources include Micromedex® (updated July 5th, 2017), Cerner Multum™ (updated July 13th, 2017), Wolters Kluwer™ (updated July 5th, 2017) and others. To view content sources and attributions, please refer to our editorial policy.