Los pendientes que lleva Laura se ven muy bien cuando hay sol.

Yes. In Spain, pendientes is the usual everyday word for earrings. The singular is pendiente.

It can also mean other things in other contexts, such as slopes or pending matters, so learners often notice that it has more than one meaning. Here, because of the context, it clearly means earrings.

Because pendiente is a masculine noun in Spanish, so it takes los in the plural.

This is one of those cases where grammatical gender does not match any natural gender idea. Earrings are just grammatically masculine nouns:

• el pendiente
• los pendientes

So even if Laura is female, the noun itself is still masculine.

Yes, llevar often means to carry or to take, but it also very commonly means to wear.

So Laura lleva los pendientes means Laura is wearing the earrings.

This is very normal Spanish for clothes, accessories, makeup, and similar things:

• Lleva un vestido rojo = She is wearing a red dress
• Lleva gafas = He/She wears glasses

Here lleva is:

• present tense
• third person singular
• from llevar

Both are possible, but que lleva Laura sounds very natural in Spanish.

The clause que lleva Laura means that Laura is wearing. In Spanish, the subject often comes after the verb, especially when the subject is already known or not being strongly emphasized.

So:

• los pendientes que lleva Laura = the earrings Laura is wearing
• los pendientes que Laura lleva = also possible, but a little less natural here

English learners often expect the subject to come before the verb all the time, but Spanish is more flexible with word order.

Here que is a relative pronoun. It means that, which, or sometimes nothing at all in natural English translation.

In los pendientes que lleva Laura, que links los pendientes with the extra information lleva Laura.

So the structure is:

• los pendientes = the earrings
• que lleva Laura = that Laura is wearing

It works like that in the earrings that Laura is wearing.

Here se ven comes from verse, which often means to look or to appear.

So se ven muy bien means they look very good or they look really nice.

It is not truly reflexive in the English sense. The se is part of the verb expression verse:

• se ve bien = he/she/it looks good
• se ven bien = they look good

Because the subject is los pendientes plural, the verb is plural:

• los pendientes se ven

Not usually in this sentence.

Literally, verse can sometimes relate to being seen, but in sentences like this it normally means to look or to appear.

So here:

• Los pendientes se ven muy bien = The earrings look very nice

If you translated it as the earrings are seen very well, that would sound unnatural in English and would miss the intended meaning.

Because verse bien is a very common expression meaning to look good.

Here bien is an adverb, and it describes how they appear visually.

So:

• se ven muy bien = they look very good / very nice

You could also say something with an adjective, for example:

• son muy bonitos = they are very pretty
• quedan muy bien = they suit someone / they look great on someone

But se ven muy bien is perfectly natural and focuses on appearance.

Literally, hay sol means there is sun or more naturally there is sunshine.

Spanish often uses hay with weather-related nouns to describe a situation:

• hay sol = it’s sunny / there is sunshine
• hay niebla = there is fog
• hay viento = it’s windy / there is wind

So cuando hay sol means:

• when there is sunshine
• more naturally, when it’s sunny

Because hay is generally not used with a definite article in this kind of expression.

Hay sol means there is sunshine / sunlight in a general sense, not the sun as a specific object.

So:

• hay sol = there is sun/sunshine
• hay lluvia = there is rain
• hay calor = there is heat

Using hay el sol would sound wrong here.

Yes. Cuando hace sol is also very natural and common.

Both mean roughly:

• when it’s sunny

There is little practical difference here:

• cuando hay sol = when there is sunshine
• cuando hace sol = when it is sunny

In everyday Spanish, both are possible, and learners will hear both.

Because this que is a relative pronoun, not a question word.

Spanish uses:

• que without an accent for relative clauses and many connectors
• qué with an accent in questions, exclamations, and indirect questions

So here:

• los pendientes que lleva Laura = the earrings that Laura is wearing

But:

• ¿Qué lleva Laura? = What is Laura wearing?

That is why there is no accent in this sentence.