einfassen
to frame / set
To surround something with a border, edge, or frame in order to stabilize, protect, or decorate it.
Der Juwelier wird den Diamanten in Platin einfassen.
The jeweler will set the diamond in platinum.

to frame / set
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to frame / set
To surround something with a border, edge, or frame in order to stabilize, protect, or decorate it.
Der Juwelier wird den Diamanten in Platin einfassen.
The jeweler will set the diamond in platinum.

'Einfassen' (to frame / set) is a separable verb. The prefix 'ein-' comes at the end in a main clause. In a subordinate clause, the verb stays together.
Der Gärtner fasst das Beet mit Steinen ein.
The gardener frames the flower bed with stones.
The verb consists of 'ein-' and 'fassen' (to hold, to grasp). The literal idea is to 'hold' something into a frame or boundary and thus fix it in place.
Sie wollte den Spiegel mit einem Holzrahmen einfassen lassen.
She wanted to have the mirror framed with a wooden frame.
To name the material of the frame or border, the prepositions 'in' (with dative) or 'mit' are used. The construction is: etwas (accusative) in/mit etwas (dative) einfassen.
Der Ring war mit kleinen Diamanten eingefasst.
The ring was set with small diamonds.
to limit / border
'begrenzen' and 'einfassen' can both have to do with an edge or border around something. 'begrenzen' says where something ends or what area it has. The border can be natural, for example a river, or artificial, for example a fence. 'einfassen' means to surround something with a border, frame, or edge, often for protection, stability, or decoration. Learners may confuse the words because both express a kind of boundary. 'begrenzen' describes more the function of the boundary, while 'einfassen' is more about surrounding something with a visible edge or border.

Lena fasst das Blumenbeet mit kleinen Steinen ein.
Lena borders the flower bed with small stones.
Eine niedrige Mauer begrenzt den Garten zur Straße hin.
A low wall borders the garden on the street side.