WGF - Holland
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Leone Langeslag - Founder

Leone Langeslag

Leone Langeslag is a graduate of the Federation for European Education in Gemmology (FEEG) (2006), an independent gemmological consultant and a dedicated teacher. Her desire to provide accessible gemmological training in the Netherlands led to the formation of the Dutch Gem Academy as part of her company Sole Leone in Naarden, only 20 minutes from Amsterdam. In addition to the theoretical and practical courses and programs offered through the Dutch Gem Academy and the World Gem Foundation. Leone also offers lectures, workshops and webinars, providing solutions for individuals and small groups who wish to become professional gemmologists. She is actively involved with the Gemma Association in Holland and a frequent visitor to international symposiums, exhibitions and trade shows where she continues her own gemmological education and passion for collecting gemstones and minerals. She also serves on the World Gem Foundation Executive Committee.

Dutch Gem Academy - Naarden (Holland)

DGA School Leone working with Students


The World Gem Foundation is a not-for-profit organization that was formed in 2015 with the mandate to provide quality and affordable gemmological training to students, jewellers and professional gemmologists.

Currently consisting of seventeen national and regional gem academies in the United Kingdom, Holland, the U.S, Canada, Spain, Belgium, France/Monaco/Switzerland, Scandinavia (Norway, Sweden, Finland, Denmark and Iceland), Eastern Europe (Bulgaria, Croatia, Czech Republic, Hungary, Macedonia, Poland, Republic of Kosovo, Republic of Moldova, Romania, Russia, Serbia, Slovak Republic and Slovenia), East Africa (Burundi, Comoros, Djibouti, Eritrea, Ethiopia, French Southern and Antarctic Lands, Kenya, Madagascar, Malawi, Mauritius, Mayotte, Mozambique, Réunion, Rwanda, Seychelles, Somalia, Somaliland, Southern Sudan, Tanzania, Uganda, Zambia, Zimbabwe), South Central Africa (Angola, Cameroon, Central African Republic, Chad, Democratic Republic of the Congo, Equatorial Guinea, Gabon, Republic of the Congo, Sao Tome and Principe, Botswana, Eswatini, Lesotho, Namibia, South Africa), West Africa (Ascension, Benin, Burkina Faso, Cape Verde, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Mali, Mauritania, Niger, Nigeria, Saint Helena, Senegal, Sierra Leone, The Gambia, Togo, Tristan da Cunha), Central America (Mexico, Guatemala, Honduras, Nicaragua, El Salvador, Costa Rica; Belize and Panama), South America (Brazil, Argentina, Bolivia, Chile, Colombia, Ecuador, Paraguay, Peru, Uruguay, Venezuela, Guyana and Suriname), the Caribbean (Aruba, Bahamas, Barbados, Belize, Cayman Islands (U.K.), Cuba, Puerto Rico, Curaçao (Netherlands), Dominican Republic, Guyana, Haiti, Jamaica, Antigua and Barbuda, Dominica, Grenada, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Sint Maarten, Suriname, Trinidad and Tobago and Turks and Caicos), Sri Lanka and India. We plan to establish more academies around the world in 2023.

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