This is a vintage or antique set of replicas of the cullinan diamonds all made of natural Rock crystal . Rock crystal is the purest variety of quartz and is transparent and completely colourless. Its name derives from the Greek term krustallos meaning 'ice' and it is the sister gemstone to colourful varieties of quartz, such as amethyst and citrine. All stones are exactly like the famous diamond size , cut , dimension etc... This set is very rare and difficult to find something like this again. Cullinan I Cullinan II Cullinan III Cullinan IV Cullinan VI All in good condition, however the Cullinan IV has some damage One corner of the stone is broken . Al the another cullinan are perfect