
der Glanz
shine
The reflection of light on a smooth, polished surface.
Der Glanz des frisch polierten Parketts spiegelte das Sonnenlicht.
The shine of the freshly polished parquet floor reflected the sunlight.
shine / splendor
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shine
The reflection of light on a smooth, polished surface.
Der Glanz des frisch polierten Parketts spiegelte das Sonnenlicht.
The shine of the freshly polished parquet floor reflected the sunlight.

splendor
A magnificent, impressive aura; grandeur or glory.
Die Ausstellung lässt den alten Glanz der Königsfamilie wieder aufleben.
The exhibition brings the royal family's former splendor back to life.

sparkle
A special gleam in the eyes that expresses joy, enthusiasm, or another strong emotion.
Als sie von ihrer Reise erzählte, hatte sie einen besonderen Glanz in den Augen.
When she talked about her trip, she had a special sparkle in her eyes.
'Der Glanz' (shine/splendor) is the noun related to the verb 'glänzen' (to shine). When something 'glänzt' (shines), then it has 'Glanz' (shine). This connection helps you remember both words together.
Die Sonne lässt den Schnee glänzen.
The sun makes the snow shine.
To describe the physical shine of a surface, the noun is often combined with adjectives such as 'seidiger Glanz' (silky shine), 'matter Glanz' (matte sheen), or 'metallischer Glanz' (metallic shine). A product can also 'Glanz verleihen' (add shine) to a surface.
Das neue Shampoo verleiht dem Haar einen seidigen Glanz.
The new shampoo gives the hair a silky shine.
In its figurative meaning, 'Glanz' (splendor) describes grandeur and fame. Fixed expressions include 'in neuem Glanz erstrahlen' (to shine in new splendor) or 'der Glanz alter Zeiten' (the splendor of former times). Here it is not about light, but about prestige and impression.
Nach der Renovierung erstrahlt das alte Schloss in neuem Glanz.
After the renovation, the old castle shines in new splendor.
The expression 'einen Glanz in den Augen haben' (to have a sparkle in one's eyes) is a fixed idiom. It describes the gleam in the eyes of a person who is very happy or enthusiastic.
Als er von seinen Kindern erzählte, bekam er einen ganz besonderen Glanz in die Augen.
When he talked about his children, he got a very special sparkle in his eyes.
bill / glow / appearance
Schein is the light given off by a source such as a lamp. Glanz, by contrast, occurs when light is reflected off a smooth or polished surface. Schein is therefore appropriate for illumination, while Glanz refers to the visible effect of light on the surface.

Der Glanz des frisch polierten Tisches ist im Licht der Lampe deutlich zu sehen.
The shine of the freshly polished table is clearly visible in the lamplight.
Der Schein der Lampe fällt auf den frisch polierten Tisch.
The glow from the lamp falls on the freshly polished table.