astronomy

Star of Sierra Leone

Star of Sierra Leone is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Star of Sierra Leone rather than just read about it. In short: The 968.9-carat (193.78 g) Star of Sierra Leone diamond was discovered by miners on February 14, 1972, in the Diminco alluvial mines in the Koidu area of Sierra Leone. It ranks as the fourth-largest gem-quality diamond and the largest alluvial diamond ever discovered.

Key takeaways

Star of Sierra Leone belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Star of Sierra Leone to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Star of Sierra Leone from memory before moving on to harder problems.

Reference excerpt

The 968.9-carat (193.78 g) Star of Sierra Leone diamond was discovered by miners on February 14, 1972, in the Diminco alluvial mines in the Koidu area of Sierra Leone. It ranks as the fourth-largest gem-quality diamond and the largest alluvial diamond ever discovered. On October 3, 1972, Sierra Leone's then-President, Siaka Stevens, announced that Harry Winston, the New York City jeweller, had purchased the Star of Sierra Leone for under $2.5 million. The stone was initially cut into an emerald shaped stone weighing 143.2 carats (28.64 g) but was later re-cut due to an internal flaw, eventually resulting in 17 separate finished diamonds, of which 13 were deemed to be flawless. The largest single finished gem was a flawless pear-shaped diamond of 53.96 carats (10.792 g). Six of the diamonds cut from the original rough were later set by Harry Winston into the "Star of Sierra Leone" brooch. A rare characteristic of the stone is its perfect chemical purity: it is ranked as a type IIa diamond, a category which includes less than 1% of all diamonds.

Illustrations

Worked examples

Example 1 — a first encounter with Star of Sierra Leone

Start with the simplest possible case. Write down what Star of Sierra Leone claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Star of Sierra Leone before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Star of Sierra Leone ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Star of Sierra Leone

In research: Star of Sierra Leone appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Star of Sierra Leone in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Star of Sierra Leone is common in secondary-school and first-year university syllabi. It links to neighbouring topics Diamonds originating in Sierra Leone, Individual diamonds, Mineralogy stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Star of Sierra Leone outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Star of Sierra Leone in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Star of Sierra Leone means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Star of Sierra Leone out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Star of Sierra Leone in simple terms?

Why does Star of Sierra Leone matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Star of Sierra Leone?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Star of Sierra Leone.