SONI DIAMONDS
SONI DIAMONDS
Client Care
Find your exact ring, necklace and bracelet dimensions for custom 18K/14K/22K gold and diamond jewellery.
Understanding the Diamond
The proportions and finish that decide how much light the diamond returns. Graded Excellent to Poor. We supply Excellent / Ideal only — it is the single biggest factor in how bright a diamond looks.
Ideal · Excellent · Very Good · Good · Fair · Poor
How colourless the diamond is, graded D (icy white) to Z (light yellow). D–F is colourless; G–J near-colourless. Our solitaires are D–F; accent stones F–G.
D · E · F · G · H · I · J · … · Z
The number and visibility of natural inclusions, graded Flawless (FL) to Included (I3). We work in VVS and VS — inclusions invisible without magnification.
FL · IF · VVS1 · VVS2 · VS1 · VS2 · SI1 · SI2 · I1–I3
The diamond's weight, not its diameter. A well-cut 1.00ct round measures about 6.4mm. Two stones of equal carat can face up very differently — cut decides that.
0.50ct ≈ 5.2mm · 1.00ct ≈ 6.4mm · 2.00ct ≈ 8.1mm
Approximate face-up size for a well-cut round brilliant. Fancy shapes vary; ask us for a shape-specific chart.
| Carat | Diameter | Looks like |
|---|---|---|
| 0.25 ct | 4.1 mm | A delicate accent or petite solitaire |
| 0.50 ct | 5.2 mm | A classic first solitaire |
| 0.75 ct | 5.8 mm | Noticeable, still understated |
| 1.00 ct | 6.4 mm | The benchmark engagement size |
| 1.50 ct | 7.4 mm | Substantial presence on the hand |
| 2.00 ct | 8.1 mm | A statement centre stone |
| 3.00 ct | 9.3 mm | Unmistakable |
Finding Your Fit
| US | UK | EU | Inner Ø (mm) |
|---|---|---|---|
| 4 | H½ | 47 | 14.9 |
| 4.5 | I½ | 48 | 15.3 |
| 5 | J½ | 49 | 15.7 |
| 5.5 | L | 51 | 16.1 |
| 6 | M | 52 | 16.5 |
| 6.5 | N | 53 | 16.9 |
| 7 | O | 54 | 17.3 |
| 7.5 | P | 56 | 17.7 |
| 8 | Q | 57 | 18.1 |
| 8.5 | R | 58 | 18.5 |
| 9 | S | 60 | 19.0 |
Step 01
Wrap a strip of paper around the base of your finger. Mark where it overlaps, lay it flat, and measure the length in millimetres. Divide by π (3.14) for the inner diameter, then read it off the master chart.
Step 02
Use a soft tape at the length you want the piece to fall, or measure an existing necklace from clasp to clasp. Add 2 cm if you wear high necklines.
Step 03
Wrap the tape snugly around the wrist just below the bone. For a chain bracelet add 1.5 cm for comfort; for a cuff, measure the narrowest point.
Size Finder
Question 1
Which piece are you sizing?
Question 2
How do you like it to sit?
Question 3
Do you know a measurement?