Why you do not attach a picture to such question?

http://www.archiviodellacomunicazione.it/sicap/lista/OpereAr...

Autore: Manifattura Veneziana
Soggetto:
Oggetto: Calice - Piede sagomato a tromba, liscio all'orlo; fusto formato da un "groppo" con mascheroni leonini impressi a stampo, compreso tra una "siela" ed un "avolio"; coppa emisferica a larghe costolature radiali, ottenute per soffiatura a stampo, orlo liscio. Decori con motivi a trina e vegetali sono incisi a punta di diamante nel piede e nella coppa; fili di lattimo disposti a raggiera sono applicati a caldo nel fondo coppa. - Vetri

Materia e tecnica: Vetro leggermente fumè. Soffiato a mano libera e a stampo nel "groppo". Incisione a punta di diamante. Decorazione a foglia d'oro., 15,4
Datazione: XVI - seconda metà
Sede museale: Palazzo Giustinian - Museo del Vetro di Murano

The parts of a chalice:
a., cuppa (cup)
b., nodus (stem or handle)
c., pes (base)

A kehely részei:

a., cuppa (csésze)
b., nodus (gomb v. fogantyú)
c., pes (talp)
https://www.harmonet.hu/ezoteria/524-kegytargyak.html

The modern priest Chalice is shaped like a countersunk cup, and is made of three parts: the foot, the stem and the cup. Its lines were furtherly simplified; decors are the same neo-Gothic or Baroque ones, mainly symbols recalling Eucharist and Passion.

The foot of the communion chalice is usually round, but can also be polygonal or have a complex shape made of lines and curves. The important thing is that it is big enough to guarantee stability to the whole structure. That is why it has to be larger than the cup.

The stem can be of various length, but it is usually proportional to the other elements. It is interrupted by a knop, an element that is both decorative and helpful to the priest for handling the chalice during the consecration.

The shape of the cup must consider its purpose. It must not be too deep and a bit long in its final part where the priest will lay his lips.

https://www.holyart.co.uk/blog/liturgical-accessories/the-pr...


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Note added at 55 perc (2022-12-07 20:18:43 GMT)
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https://www.researchgate.net/figure/Detail-of-the-stem-of-th...

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Note added at 56 perc (2022-12-07 20:20:14 GMT)
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The material was gold, richly decorated with enamels and precious stones. In shape it was without handles and like a celery glass, with a very deep cup and no stem, but the cup was joined to the base by a knop, which under the name of nodus or pomellum became a very characteristic feature in the chalices of the Middle Ages. In many of the specimens described or preserved from the Merovingian, Carlovingian, and Romanesque periods, it is possible to make a distinction between the ordinary sacrificial chalice used by bishops and priests in the Mass and the calices ministeriales intended for the Communion of the faithful at Easter and other seasons when many received.
https://www.catholic.com/encyclopedia/chalice

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Note added at 59 perc (2022-12-07 20:23:15 GMT)
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(Maria, if you have any other questions, I will work tonight so I will follow your questions)

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Note added at 1 nap 2 óra (2022-12-08 22:16:36 GMT)
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https://www.britishmuseum.org/collection/object/H_1886-0619-...
Description
Chalice; silver-gilt and copper-gilt; sexfoil base engraved with lines terminating in fleur-de-lis; bowl of oviform shape and hexagonal enamelled stem; large knop decorated with six circular projecting medallions, each containing half-length enamelled figure of a saint; remaining area of knop decorated with foliate design; inscribed.

https://www.finch-and-co.co.uk/artwork-detail/812432/18675/a...
An hexagonal stem and chased knop of a medieval Tuscan copper gilt Chalice

around the base we find Apostle busts and the symbols of the Evangelists, and on the knop the Man of Sorrows scene surrounded by angels, as well as the Mother of God flanked by Moses and Saint Catherine.
https://stcatherines.mused.org/en/items/146885/chalice-with-...

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Note added at 1 nap 2 óra (2022-12-08 22:17:24 GMT)
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(I wanted just highlight the word knop)

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Note added at 1 nap 2 óra (2022-12-08 22:18:49 GMT)
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https://www.artemisgallery.com/product/lot-auction-12-8-2022...
Lot , Auction 12/8/2022: 15th C. European Gilt Brass Chalice Stem, Glass Inlays
Western Europe, Renaissance Period, ca. 15th to 16th century CE. A beautiful gilt brass chalice stem exhibiting a prominent knop adorned with 6 enameled glass medallion inlays.

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Note added at 1 nap 2 óra (2022-12-08 22:19:58 GMT)
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https://agnuschurchsupply.co.uk/chalices/1126-decorated-knop...
Beautiful handmade and high quality chalice, featuring a hammered-look effect around the base of the piece, and a large ornate knop in the centre of the stem.