Diamond

''This article of for the salable jewel called a Diamond. For the subweapon, see Rebound Stone'' A Diamond is generally the most valuable Jewel found in Castlevania.

It's first appearance was in Castlevania: Symphony of the Night as a "Highly Valuable Ring". It could be sold to the Master Librarian for 5000 Gold, which the highest value for any jewel ring, being more valuable than an Opal (5000 G) and less valuable than a Diamond (20000 G). Diamond is extremely rarely dropped by the Jewel Sword (if ever).