You have the following information for Shamrock Gems. Shamrock uses the periodic method of accounting for its inventory transactions. Shamrock only carries one brand and size of diamonds-all are identical. Each batch of diamonds purchased is carefully coded and marked with its purchase cost. March 1 Beginning inventory 189 diamonds at a cost of $386 per diamond. 3 Purchased 252 diamonds at a cost of $44 Teach. 5 Sold 236 diamonds for $756 each. 10 Purchased 425 diamonds at a cost of $484 each. 25 25 Sold 496 diamonds for $819 each.