× Sign up for our newsletter Email* × Mail to friend Send to your friend this product Your Email* Friend Email Message* Comments This field is for validation purposes and should be left unchanged. × Book A Tour Contact a diamond consultant Contact a diamond consultant Our award winning diamond consultants help you select the best diamond jewellery for any budget. Mr. / Mrs.* Mr. Mrs. First Name* Last Name* Phone number Email address* Message Email This field is for validation purposes and should be left unchanged. Search Diamondland logo Book a Tour Email Customer Service The 8 diamond guarantees Royal Coster Diamonds is the best choice for a reason. Not only does our long and rich history tells you that you can trust your jewelry with us, Royal Coster wants to provide you with certainty in every area when you purchase something as valuable as a diamond. Therefore we’ve created Royal Coster Diamonds’ 8 diamond guarantees. 8 diamond guarantees #1 Royal Coster, 175 years of craftsmanship Royal Coster Diamonds was founded in 1840. Since then we created the most beautiful jewelry and polished some of the most valuable diamonds ever found. With over 175 years of extraordinary craftsmanship, you can certainly trust us with your jewelry as well. 8 diamond guarantees #2 Lifetime diamond upgrades Royal Coster Diamonds loves to see a diamond ring passed on for generations. Therefore we reimburse 100% of the price you paid when you bought the ring if you want to upgrade the diamond in it. 8 diamond guarantees #3 Personal and honest advice Diamonds come in different shapes, sizes, colours and quality. To select the perfect diamond that fits your personal taste Royal Coster Diamond has more than 150 diamond consultants who offer customized advice in over 27 languages. 8 diamond guarantees #4 Knowledge is everything Royal Coster Diamonds is well aware that purchasing diamond jewelry is a serious matter. In order to let you make an informed decision we give you a thorough insight in the 4 C’s of diamond valuation. At Coster Diamonds we want you to get the best value for your money! 8 diamond guarantees #5 Only the finest quality diamonds Royal Coster Diamonds’ diamond polishers are considered to be the best in the business. Their passion for perfection and extraordinary craftsmanship turns every rough diamond into a beautiful piece of jewelry that lasts for centuries. 8 diamond guarantees #6 Straight from the source Royal Coster Diamonds has the largest stock of diamonds in Europe. We receive those rough diamonds straight from the source, no middleman is involved. That’s why we can offer you the best price for your diamonds. 8 diamond guarantees #7 Honest and responsible diamonds At Royal Coster Diamonds we can trace all our purchased diamonds directly back to their source. This makes sure that we stay far away from conflict or ‘blood’ diamonds. 8 diamond guarantees #8 Only the highest standard of Diamond certification Royal Coster Diamonds has internationally acclaimed certifications for all its diamonds such as the HRD, IGI, GIA or Coster Diamonds. Contact us now First Name* Last Name* Phone Email* Extra information Email This field is for validation purposes and should be left unchanged. Our Legacy Royal Coster Diamonds Related stories How we created the diamond watch for the Queen of the Netherlands When we started the Diamond Museum Amsterdam CUSTOMER SERVICE Email Customer Service Product Care Privacy Policy Terms & Conditions CONNECT TO US Sign up for our newsletter Facebook Twitter Instagram Pinterest CORPORATE INFORMATION About Royal Coster Diamonds Press & News Country Managers CONTACT Royal Coster Diamonds B.V. Paulus Potterstraat 2-6 1071 CZ Amsterdam The Netherlands. +31 (0)20-305 5555 +31 (0)20-305 5556 Open daily, including Sundays from 09:00 AM to 17:00 PM © 2018 Coster Diamonds. All Rights Reserved Royal Coster Diamonds Diamond Rings Diamond Jewelry Book a free guided tour Tours & workshops Coster Diamonds VIP Service About Royal Coster Blog