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Central Coast Gemological Laboratory - Services include cutting, appraisal, classes and gem sales.
European Gemological Laboratory - European Gemological Laboratory's is and international.
GemWorld - Provide opals, gemstones, collector stones, synthetics, cabbing and faceting rough, lapidary equipment and supplies.
Global Gemological Laboratory - Diamond grading reports and appraisals.
Harold Weinstein Ltd. - Gemological laboratory specializing in fine jewelry insurance, estate appraisals, and diamond grading.
Kashmir Sapphires - A network of gemologists, private collectors, and international financiers for the buying and selling of kashmir and burmese sapphires.
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