Carat vs Gram vs Tola vs Ratti : Understanding Jewellery Weight in India

When buying jewellery or gemstones, you may come across different weight measurements such as carat, gram, tola and ratti.

If you are not familiar with these terms, it can be confusing to understand how much a gemstone or a piece of gold actually weighs.

The good news is that the difference is simple once you understand what each unit means.

In this guide, we explain carat, gram, tola and ratti, how they are different, how they are converted, and where each unit is commonly used.

What Is a Gram?

A gram (g) is the standard metric unit used to measure weight.

It is commonly used to measure the weight of:

• Gold jewellery

• Silver jewellery

• Platinum jewellery

• Diamonds and gemstones

• Other precious metals

For example, if a gold ring weighs 5 grams, its metal weight is 5 grams.

Grams are widely used in modern jewellery stores because they provide a standard way to measure weight.

What Is a Carat?

A carat (ct) is a unit used to measure the weight of gemstones, including diamonds.

1 carat = 0.20 grams = 200 milligrams.

So:

• 0.50 carat = 0.10 gram

• 1 carat = 0.20 gram

• 2 carats = 0.40 gram

• 5 carats = 1 gram

Carat is particularly important when buying diamonds because diamond prices are often quoted based on carat weight along with the other 4Cs: cut, colour, clarity and carat.

It is important not to confuse carat (ct) with karat (K or KT).

Carat measures the weight of a gemstone, while karat refers to the purity of gold.

For example, a 1 carat diamond and 18KT gold are describing two completely different things.

What Is a Tola?

A tola is a traditional unit of weight that has historically been used in South Asia, particularly for gold and other precious metals.

Today, you may still hear the term when discussing gold, especially in traditional jewellery markets and bullion trading.

1 tola = approximately 11.66 grams.

Therefore:

• 1 tola ≈ 11.66 grams

• 2 tola ≈ 23.32 grams

• 5 tola ≈ 58.30 grams

• 10 tola ≈ 116.60 grams

For most modern jewellery purchases, grams are more commonly used than tola.

What Is Ratti?

Ratti is a traditional Indian unit of weight that has historically been used for gemstones and other small items.

You may still come across ratti when buying gemstones, especially in the Indian gemstone and astrology market.

However, there is an important point to remember: ratti does not always have one universally used gram value. Different traditions and trade practices can use different ratti standards.

For example, some references use approximately 0.1215 grams for one ratti, while the traditional "pakki ratti" used in some gemstone contexts is around 0.182 grams.

This is why it is important to ask the seller which ratti standard they are using before comparing prices or gemstone weights.

Carat vs Gram vs Tola vs Ratti

Here is a simple comparison:

A carat has a fixed international definition of 0.20 grams. Ratti, on the other hand, can vary depending on the convention being followed.

Carat to Gram Conversion

Converting carat to grams is easy.

1 carat = 0.20 grams

So, you can multiply the carat weight by 0.20.

Examples

1 carat

1 × 0.20 = 0.20 grams

2 carats

2 × 0.20 = 0.40 grams

3 carats

3 × 0.20 = 0.60 grams

5 carats

5 × 0.20 = 1 gram

This is why a 5 carat gemstone weighs only 1 gram.

Gram to Carat Conversion

To convert grams into carats, multiply the weight in grams by 5.

1 gram = 5 carats

For example:

• 0.20 g = 1 carat

• 0.40 g = 2 carats

• 0.60 g = 3 carats

• 1 g = 5 carats

• 2 g = 10 carats

This conversion is particularly useful when comparing gemstone specifications.

Tola to Gram Conversion

The commonly used modern conversion is:

1 tola ≈ 11.66 grams

For example:

2 tola  :-  2 × 11.66 = 23.32 grams

5 tola :- 5 × 11.66 = 58.30 grams

If a seller quotes gold weight in tola, converting it to grams can make it easier to compare prices with jewellery quoted in grams.

Gram to Tola Conversion

To convert grams into tola:

1 gram ≈ 0.0857 tola

For example:

10 grams :- 10 × 0.0857 ≈ 0.857 tola

20 grams :- 20 × 0.0857 ≈ 1.714 tola

Carat vs Ratti: Are They the Same?

No., Although both are used to describe gemstone weight, carat and ratti are different units.

A carat has a fixed value:

1 carat = 0.20 grams

Ratti can vary depending on the measurement convention being used.

For example, if the seller is using a ratti value of approximately 0.1215 grams:

1 ratti ≈ 0.61 carat

If the seller is using the approximately 0.182 gram "pakki ratti" standard:

1 ratti ≈ 0.91 carat.

So, if someone tells you that a gemstone weighs "5 ratti", do not assume its carat weight without first confirming which ratti standard they are using.

Why Is Carat Commonly Used for Diamonds?

Carat is the internationally recognised unit for gemstone weight, making it easier for buyers and sellers across different countries to compare diamonds.

For example, a diamond described as 1.00 ct has a standard weight of 0.20 grams.

However, carat weight alone does not determine how valuable or beautiful a diamond is.

Two diamonds with the same carat weight can have different prices because of differences in:

• Cut

• Colour

• Clarity

• Shape

• Certification

This is why you should look at the complete diamond specification instead of focusing only on carat weight.

Why Is Gram Used for Gold Jewellery?

Gold jewellery is generally sold by its metal weight in grams.

For example, a jewellery piece may contain:

Gold weight: 5 grams

The final price can depend on several factors, including:

• Gold purity

• Gold rate

• Making charges

• Diamond or gemstone cost

• Other materials used

• Taxes

Remember that the gram weight tells you the weight, while karat tells you the purity of the gold.

For example:

• 18KT gold = 75% pure gold
• 22KT gold = approximately 91.6% pure gold

Carat vs Karat: Do Not Confuse Them

Carat and karat sound similar, but they measure two completely different things in jewellery.

Carat (ct)

Carat is used to measure the weight of diamonds and other gemstones.

1 carat = 200 milligrams = 100 points

For example, a 1.5 ct diamond weighs 300 milligrams.

Karat (K or KT)

Karat indicates how much pure gold is present in a gold alloy.

• 24KT gold: Approximately 99.9% pure gold

• 22KT gold: Approximately 91.6% pure gold and 8.4% alloy

• 18KT gold: 75% pure gold and 25% alloy

• 14KT gold: Approximately 58.5% pure gold and 41.5% alloy

• 9KT gold: 37.5% pure gold and 62.5% alloy

In simple terms:

Carat = diamond or gemstone weight

Karat = gold purity

They sound similar but mean completely different things.

Quick Conversion Chart

The ratti conversion should always be confirmed with the seller because different standards are used.

Which Unit Should You Use When Buying Jewellery?

The unit you should pay attention to depends on what you are buying.

For diamonds

Look at carat weight (ct).

For coloured gemstones

Carat is generally the easiest standard for comparing gemstone weights, although ratti may still be used in the Indian market.

For gold jewellery

Look at the weight in grams and the gold purity in karat.

For traditional gold trading

You may still come across tola, especially when discussing larger quantities of gold.

Why Understanding Jewellery Weight Matters

Knowing these measurements can help you compare jewellery more accurately.

For example, if one gemstone is listed as 2 carats and another is listed as 2 ratti, you cannot assume that they weigh the same.

Similarly, if gold is quoted per tola instead of per gram, converting the price to grams can help you make a better comparison.

Understanding the unit also helps you read jewellery invoices, diamond certificates and gemstone specifications with more confidence.

Final Thought

Understanding jewellery weight is not about remembering every conversion. It is about knowing which unit applies to which material. Gold is generally weighed in grams or tolas, while diamonds are measured in carats. Ratti may still appear in gemstone purchases, but its exact value should always be confirmed with the seller.

Before comparing prices, check whether the stated weight refers to the complete jewellery piece, only the gold, or the diamonds and gemstones separately. This small check helps you understand what you are paying for and prevents incorrect comparisons.