Скол маленький, а уценка большая.

In Russian, the verb to be is normally omitted in the present tense.

So:

• Скол маленький = The chip is small
• Уценка большая = The markdown is big / The discount is large

Russian does not usually say есть in sentences like this. Using есть here would sound unnatural.

A useful pattern to remember is:

• Он студент. = He is a student.
• Дом большой. = The house is big.
• Скол маленький. = The chip is small.

So this sentence is perfectly normal Russian.

Because they must agree with the nouns they describe.

• скол is masculine singular
• уценка is feminine singular

So the adjectives change form:

• маленький скол → masculine singular
• большая уценка → feminine singular

That is why you get:

• Скол маленький
• Уценка большая

This is basic adjective agreement in Russian: adjectives match the noun in gender, number, and case.

They are in the nominative case.

This is because each part of the sentence works like a simple statement:

• Скол маленький
• Уценка большая

In Russian, when you say X is Y in the present tense, the noun and the predicate adjective are often in the nominative.

So here:

• скол = nominative singular
• уценка = nominative singular
• маленький agrees with скол
• большая agrees with уценка

Not exactly.

Скол usually means a chip: a small piece broken off a hard surface. For example:

• chipped ceramic
• chipped glass
• chipped enamel
• chipped edge on furniture or a device

It is different from:

• трещина = a crack
• царапина = a scratch

So скол маленький suggests that the defect is a small chip, not a long crack or just a surface scratch.

They are related, but not exactly the same.

• скидка = a discount in general
• уценка = a markdown, often because the item has a defect, damage, old packaging, or has lost value for some reason

So in this sentence, уценка is especially appropriate because the item has a flaw: скол.

The idea is something like:

• the defect is small,
• but the price reduction is large

That nuance is stronger with уценка than with the more general word скидка.

Here а shows contrast.

In many contexts, а can be translated as:

• and
• while
• whereas
• but

In this sentence, it is contrastive:

• Скол маленький, а уценка большая.
• The chip is small, but the markdown is large.

Why not но?

• но often gives a stronger, more direct contradiction
• а often sets two facts side by side in contrast

Here а sounds very natural because the sentence is comparing two things:

• small defect
• large markdown

So а is a very good choice.

Because а is a coordinating conjunction joining two clauses:

• Скол маленький
• а уценка большая

In Russian, a comma is normally used before а in this kind of structure.

So the punctuation here is standard and expected.

Grammatically, yes, because а can sometimes be close to and. But in this sentence, that translation misses the main feeling.

The sentence is clearly contrastive:

• the defect is only small,
• yet the reduction in price is large

So in natural English, but is usually the best choice here.

It sounds very natural in a shopping / sales / marketplace context.

You might hear or see it when someone is talking about:

• a discounted item with a minor defect
• store pricing
• second-hand goods
• damaged packaging
• an online listing

It feels fairly neutral conversational Russian. It is short and efficient, which is common in spoken Russian and in informal commercial language.

Yes, Russian word order is flexible, but the original order is the most neutral here.

Original:

• Скол маленький, а уценка большая.

Possible variations:

• Маленький скол, а уценка большая.
• Уценка большая, а скол маленький.

These versions may change the focus or emphasis slightly.

The original version presents each noun first and then comments on it, which is a very natural structure.

Both are possible, but they are not identical in tone.

• маленький = small
• небольшой = not large / rather small / relatively small

маленький is simpler and more direct. небольшой can sound a little more formal, softer, or more measured.

Compare:

• Скол маленький = The chip is small.
• Скол небольшой = The chip is not large / is fairly small.

In this sentence, маленький sounds straightforward and natural.

Yes. Even without saying it directly, the sentence often implies something like:

• The defect is minor, but the price reduction is surprisingly large.

Depending on context, that could sound:

• positive: good deal
• skeptical: the markdown seems excessive
• persuasive: the flaw is tiny, but you get a big discount

So the sentence does more than just describe facts; it can also suggest an evaluation or sales argument.