The Shield Cut

(via Diamond Cuts in Historic Jewelry:1381-1910) Herbert Tillander writes:

Inventories of the fourteenth and fifteenth centuries describe triangular diamonds in different ways—for instance, as en demies losanges, plats à 3 quarrés, plats aux 2 costez fais à 3 quarrés, and couchiés. Most descriptions, however, include the word écu (French, from the Latin scutum, meaning a shield)—‘en guise ďun escu’, ‘en façon ďescusson’, etc. I have included all historical triangular cuts under this one heading (even those entries which represent triangular Table Cuts and Mirror Cuts), because for centuries the shield played such an important role in warfare and heraldry, and the shape of the stone took precedence over the cut. Modern triangular diamonds are described, according to the cut, as Brilliants or Step Cuts, and only as Shields if the sides are rounded.

A cleavage of an octahedral crystal (a ‘was’) displays one side with a dominating triangular face (one of the octahedral faces). It looks like a Pyramidal Point Cut, deeply buried, with only one of its faces, and small areas of the surrounding faces, exposed. This is described in French as couchié and in German as liegender.

The most important known historical jewel containing large Shield Cuts was owned by Charles the Bold, Duke of Burgundy. On his ‘Feather’, in addition to five large spinels, a Burgundian Point Cut and a Table Cut diamond weighing 7-8 ct, there were two Shields, each about 12 mm in diameter and weighing about 6 ct. They were described in 1504 as ‘zwen demant schilt mit dryen anhangenden eggkenden falsetten, gutt wasser, wigt yeglicher ungeverlich kratj sechse’. Perhaps the oldest surviving examples of Table and Table Cut Shields are to be found on the Burgundian Court Goblet, dating from the middle of the fifteenth century.