Carats, Gram, Tola & Rati Comparison

When dealing with gemstones, gold, or traditional measurement systems, understanding the differences between units like Gram, Tola, Rati, and Carats is essential. This guide will help you make informed decisions by explaining their usage and conversions.

Key Differences

Unit Definition Common Usage Conversion
Gram The Gram (g) is a metric unit of mass, widely recognized and used globally for measuring weight. Measuring gold, silver, and other commodities. 1 Gram = 0.085735 Tola
1 Gram = 5 Rati
1 Gram ≈ 5 Carats (for gemstones)
Tola The Tola is a traditional South Asian unit of mass, historically used for measuring precious metals like gold and silver. Popular in India, Pakistan, and neighboring countries. 1 Tola = 11.66 Grams
1 Tola = 58 Rati
1 Tola ≈ 58.3 Carats
Rati The Rati is an ancient Indian unit primarily used for weighing gemstones, seeds, and Ayurvedic herbs. Measuring gemstones and seeds. 1 Rati = 0.182 Gram
1 Rati ≈ 0.91 Carats
1 Rati = 0.01709 Tola
Carat (Gemstones) A Carat (ct) is a standard unit used to measure the weight of gemstones, where 1 Carat = 200 mg (0.2 g). Weighing diamonds, rubies, emeralds, and other gemstones. 1 Carat = 0.2 Grams
1 Carat ≈ 0.0171 Tola
1 Carat = 0.2 Rati
Carat (Gold) Carat (kt) indicates the purity of gold, measured as parts of gold in 24 parts of the total alloy. Measuring gold purity (e.g., 24k, 22k, 18k). 24k = 99.9% pure gold
22k = 91.6% pure gold
18k = 75% pure gold

Detailed Explanation

Gram

  • Origin: Part of the metric system introduced in France during the 18th century.
  • Applications: Widely used in the jewelry industry, grocery markets, and laboratories for precise measurements.

Tola

  • Historical Background: A traditional unit from the Mughal era, primarily used in South Asia for gold and silver.
  • Modern Usage: Still popular for traditional transactions but often converted to grams for global trade.

Rati

  • Cultural Significance: An ancient Indian unit used to weigh gemstones and seeds, especially in traditional and Ayurvedic practices.
  • Gemstone Industry: Frequently used in India for weighing gemstones like diamonds and rubies.

Carats (Gemstones)

  • Definition: A Carat equals 0.2 grams, making it the standard unit for weighing gemstones.
  • Global Standard: Adopted worldwide for gemstone valuation and trade.
  • Applications: Used for diamonds, emeralds, rubies, and other precious stones.

Carats (Gold)

  • Definition: Indicates the purity of gold, with 24k being the purest form (99.9% gold).
  • Usage: 22k and 18k are commonly used for making jewelry to add strength and durability.
  • Purity Breakdown:
    • 24k: 99.9% pure gold
    • 22k: 91.6% pure gold
    • 18k: 75% pure gold

Quick Conversion Table

Unit To Grams (g) To Tola To Rati To Carats (Gemstones)
1 Gram 1 0.085735 5 5
1 Tola 11.66 1 58 58.3
1 Rati 0.182 0.01709 1 0.91
1 Carat (Gemstones) 0.2 0.0171 0.2 1

Practical Example

If a gemstone weighs 2 Carats:

  • In Grams: 2 × 0.2 = 0.4 g
  • In Tola: 2 × 0.0171 = 0.0342 Tola
  • In Rati: 2 × 0.2 = 0.4 Rati

Understanding these units ensures accuracy in trade and allows seamless conversion for both local and global standards.