Diamond prices do not rise in a straight line with carat weight. In many cases, simply approaching a certain “threshold” causes the price to jump significantly. Understanding these thresholds helps you buy higher-value diamonds that look almost the same size.
This article explains the relationship between diamond carat and price, and how to use threshold strategies.
What Are Diamond Weight Thresholds?
The diamond market has clear preferences for certain whole-carat weights, for example:
- 0.50 carat
- 0.70 carat
- 1.00 carat
- 1.50 carat
- 2.00 carat
When a diamond reaches these weights, demand is higher and the price often rises noticeably. Conversely, diamonds just below these thresholds (such as 0.90 ct or 0.98 ct) look very similar in size but are usually more affordable.
Common Thresholds and Strategies
| Target Size | Better-Value Choice | Notes |
|---|---|---|
| 1.00 carat | 0.90 – 0.98 carat | Visually very close, usually significantly lower price |
| 1.50 carat | 1.40 – 1.48 carat | Saves budget while keeping good presence |
| 2.00 carat | 1.80 – 1.95 carat | Strong presence at a more accessible price point |
If your priority is overall look rather than the exact number on the certificate, choosing just under a major threshold is often a smart move.
Other Factors That Affect Value
- Cut quality strongly influences how large a diamond appears
- Colour and clarity still matter for overall beauty
- Lab-grown diamonds generally offer more flexibility within the same budget
Explore Natural Diamonds
Explore Lab-Grown Diamonds
Frequently Asked Questions (FAQ)
Q1: Is a 0.90 ct diamond noticeably smaller than 1.00 ct?
In most cases the difference is hard to notice with the naked eye, especially with a good cut.
Q2: Are price jumps the same for natural and lab-grown diamonds?
The principle is similar, although the absolute price levels differ.
Q3: Should I always avoid exact whole-carat weights?
Not necessarily. If the overall quality and look are excellent, an exact 1.00 ct can still be the right choice.
