This is a ciborium, and yes with kerubim on it. The reason I have for saying this is the twofold nature of the word. note the simularity of the words.. I am almost positive A.E. Waite did.
The ciborium is the canopy in the sancutary, as found on the cancer card, The Chariot. There are two aspects of the angel on the gemini Card, The Lovers. These two are in precedence of the Yechidah (the big obvious angel.) She stands in observation of the two. Air and Water form the hexagram compleat, and this brings forth the water - the alchemical water "that does not wet the hand" thus the cup has no wet water therein.
She bears the cup-shaped ciborium, which holds the sacramental bread. Bread is a type of earth, brought forth from grain fed by the sun, earth tilled by air. In astrology, she is the last decan of gemini and the first two decans of cancer, thus the summer solstice occurs under her auspice.
Air is zain - the "sword" of the phallus, but also the plowshare.
Luna is demeter, sacred to grain. in this case barley.
This use of bread as the cup's contents, therefore is a sign of where grain left over from "the feast of unleavened bread" of first fruits was offered for making shewbread, and also to ferment for alchohol. Also the whole "bun in the oven" reference takes on new meaning entirely. This would make basically, for a baby, if 9 months, a near new-years baby. consistent with the deck's creators' christian sacred mythos. Of course, this is not part of the original description from Book T, where she is supposed to be holding a cup with a crayfish popping out. That was supposed to show the nature of trine to her Knight and lover - Knight of Cups. He rules the last decan of Aquarius, and the first two of Pisces.
This is Mariah/Semele/Deichtine, mother of Iesu/Dionysus/Setanta during the time of her visitation, in any myth of your choice. A.E. Waite and Pixie made an awesome revision optimised for their Christian sensibilities.
For Iesu says that the bread is his body. Also the church is called the Body of Christ. Corpus Christi is latin for "Body of Christ." This approximates it to the Trinity Sunday in their faith which falls in the vicinity of this card.
The other type of earth is salt, which is earth as spirit passive. these are shown in the cubical shape of her crown, for salt is cubically crystalline, and yellow is the color of sodium burning and chlorine saturation. hence it is yellow.
The reason earth is displayed is the cup is made of earth, to hold water.
The only thing missing is the lotuses, but they are alluded to in her mantle.