Diamond Grading – The 4Cs Matrix (Quality Scorecard)

This matrix determines quality first, then price.

The 4Cs Grading Table

1. Carat (Weight → size → price jump)

Carat	Market Behavior
0.30 – 0.90	Affordable
1.00	BIG price jump (magic size)
2.00	Premium category
3.00+	Luxury / rare
5.00+	Investment class

👉 Price does NOT increase linearly
1ct = $6k
2ct ≠ $12k → maybe $18–22k

2. Color (D → Z scale)

Grade	Description	Value
D–F	Colorless	⭐ Highest
G–J	Near colorless	Excellent value
K–M	Slight yellow	Mid
N–Z	Visible tint	Low

👉 Each step down can reduce 5–15% price

3. Clarity (Internal flaws)

Grade	Meaning	Value
FL	Flawless	Ultra rare
IF	Internally flawless	Very high
VVS1–2	Minute flaws	Premium
VS1–2	Slight flaws	Best value
SI1–2	Visible under loupe	Budget
I1–3	Eye visible	Low

👉 VS range = sweet spot for jewelry

4. Cut (Most important for beauty)

Grade	Sparkle
Excellent	🔥 Maximum brilliance
Very Good	Bright
Good	Decent
Fair/Poor	Dull

👉 Cut impacts beauty more than size

 

Pricing Matrix (How Dealers Actually Price)

Professionals use something like the Rapaport price grid:

Example Pricing Matrix (Illustrative)

1 Carat Round Diamond

Color ↓ / Clarity →	IF	VVS1	VS1	SI1
D	$14,000	$13,200	$11,800	$9,800
F	$12,500	$11,600	$10,400	$8,500
G	$11,000	$10,200	$9,200	$7,800
H	$9,500	$8,700	$7,900	$6,500

👉 Formula jewelers use:

Price = Rap Rate × Carat × Market Discount/Premium

Example:
VS1 G color 1.2ct
$9,200 × 1.2 = $11,040
Dealer discount 10%
Final ≈ $9,900

Diamonds are super versatile — you can go minimal daily wear or royal red-carpet drama, same stone, totally different vibe.

In the trade, a few patterns sell again and again because they balance:
✔ sparkle
✔ durability
✔ resale value
✔ easy manufacturing

Let’s walk through the most used diamond jewelry patterns you’ll see in showrooms worldwide.