Diamond Carat Weight: Size vs Value
Carat weight is the most discussed — and often most misunderstood — aspect of diamond buying. Let's break down what carat weight really means and how to get the best value.
What Is a Carat?
A carat is a unit of weight, not size. One carat equals 200 milligrams (0.2 grams). A 5-carat diamond weighs exactly 5 times more than a 1-carat diamond — but it doesn't necessarily look 5 times bigger.
Carat vs Size
Two diamonds of the same carat weight can look very different in size depending on:
- Cut quality: A well-cut diamond reflects more light and appears larger
- Shape: Oval and marquise cuts appear larger than round cuts of the same weight
- Depth percentage: A shallow diamond has a wider face but less sparkle
- Table percentage: A larger table makes the diamond appear bigger
The Price Jump
Diamond prices don't increase linearly with carat weight — they jump significantly at "magic numbers":
- 0.50ct: $800-$1,500 (depending on quality)
- 0.75ct: $1,800-$3,000
- 1.00ct: $3,500-$7,000 (big jump!)
- 1.50ct: $6,000-$12,000
- 2.00ct: $12,000-$25,000+ (another big jump!)
The "Just Under" Trick
Buy just under a magic number for significant savings:
- 0.95ct instead of 1.00ct (save 15-20%, looks identical)
- 1.45ct instead of 1.50ct (save 10-15%)
- 1.95ct instead of 2.00ct (save 10-15%)
These "under-carat" diamonds look virtually identical to their round-number counterparts but cost significantly less.
How Big Is That Carat?
For a round brilliant diamond, approximate face-up sizes:
- 0.50ct: ~5.2mm diameter
- 1.00ct: ~6.5mm diameter
- 1.50ct: ~7.4mm diameter
- 2.00ct: ~8.2mm diameter
Carat Weight vs Other Cs
The smartest buyers balance all 4Cs:
- Smaller carat + better cut: More beautiful, better value
- Larger carat + lower color: Still beautiful in yellow gold settings
- Larger carat + lower clarity: SI1-SI2 in brilliant cuts look clean
What Carat Weight Should You Buy?
Consider:
- Budget: What can you comfortably afford?
- Finger size: Smaller fingers make diamonds look larger
- Lifestyle: Very large diamonds may be impractical for active lifestyles
- Partner's preference: Some prefer size, others prefer sparkle
The Bottom Line
Carat weight matters, but it's not everything. A well-cut 1.2ct diamond will look more beautiful than a poorly-cut 1.5ct. Focus on overall beauty, not just size.
Find your perfect balance of size and quality at Lara Jewels.
