About Us Ruppenthal  Associations Ruppenthal are members of The Gemmological Association and The British Jewellers Association members . We also have a resident Gemmologist with over 36 years experience. History Originally a gemstone company from idar oberstein with over a hundred years experience in the gemstone industry, we are now wholey committed to producing fine quality 18ct gemstone & diamond jewellery. Included in our extensive range are loose gemstones, precious & semi precious bead necklaces, cultured pearls gemstone carvings, black diamonds and magnetic clasps. Exhibitions International Jewellery London Location Our full address and contact details can be found here  |