Though they sound the same, “carat” and “karat” refer to two entirely different measurements—both important in the world of fine jewellery.

1. Carat (ct) – Used for Gemstones

• What it measures: Weight, specifically of gemstones like diamonds, sapphires, rubies, etc.
• Standard: 1 carat = 0.2 grams
• Example: A 1.00ct diamond weighs 0.2 grams, while a 2.00ct diamond weighs 0.4 grams.

Carat affects a gemstone’s value, but it’s one of several key factors—including cut, clarity, and colour—that influence overall beauty and brilliance.

2. Karat (kt) – Used for Gold Purity

• What it measures: Purity of gold, expressed in parts out of 24
• Standard:
  • 24kt = pure gold (99.9%)
  • 22kt = 91.6% gold
  • 18kt = 75% gold
  • 14kt = 58.5% gold

While the spelling “karat” is commonly used in the United States, in the UK and many other countries, we spell it “carat” for both gold and gemstones—context determines the meaning.

PureJewels Approach

At PureJewels, we specialise in fine jewellery crafted in 18ct, 22ct, and 24ct gold, and all our diamonds and gemstones are measured in carats. Whether you’re exploring a 0.50ct solitaire or a 22ct gold heirloom bangle, we guide you with clarity and integrity, so you always know exactly what you’re receiving.