I May not be the sharpest blade in the Scabbard but this may be one tricky Riddle...
So the riddle side of ME psyche tends to believe that there are no HIDDEN Sapphires... For All the Gems Be Cut in the classic Baguette style. If they were hidden wouldn't they be locked away under a strong Master-Smith's Finest Strong-Lock with YE only key secured in a Captain's Treasure Map behind challenges and Riddles that Only HE truly Knows.
But May hab this Old SEADOG BE thinking harder then a damaged Main Rigger and Shredded Sail desperately trying to tack into a dying Head-Wind while the wolves BE nippin'' on YE Bow.
But if One truly must count Ye Ill-Gotten Crystals then I say there BE...
... of these Devil's Glass Shining as Dark Blue Deeper than the Deepest Ocean
... Captain GreyBeard Signing off to set Sail for Adventure and Bounty...