◆

Lab-Grown Alexandrite & IGI Certified Diamonds

The centre alexandrite is lab-grown, displaying the stunning colour-change effect from green in daylight to red/purple under incandescent light. Side diamonds are IGI certified lab-grown stones.

◆

3–5 Week Delivery

Every piece is handcrafted to order on the Isle of Man. We always aim to be as quick as we possibly can — but we ask for 3–5 weeks to make sure we meet your expectations.

Alexandrite Trilogy Ring

£1,650

A breathtaking trilogy ring featuring a lab-grown alexandrite centre stone flanked by brilliant-cut lab-grown diamond shoulders. The alexandrite displays a mesmerising colour-change from vivid green in daylight to rich red-purple in candlelight. Handcrafted on the Isle of Man.

Select Metal

9K White Gold

9K Yellow Gold

9K Rose Gold

18K White Gold

18K Yellow Gold

18K Rose Gold

Platinum

Select Alexandrite Size (Lab-Grown)

1.0ctBase

1.5ct+£400

2.0ct+£800

3.0ct+£1,800

4.0ct+£2,800

5.0ct+£3,800

6.0ct+£4,900

7.0ct+£6,000

8.0ct+£7,000

Select Ring Size (UK) Size Guide

Ring Size Guide

Method 1 — Measure an Existing Ring

If you already own a ring that fits the correct finger, simply measure the inside diameter in millimetres and use the chart below to find your UK size.

Place the ring flat on a ruler.
Measure the inside diameter (from inner edge to inner edge) in mm.
Match your measurement to the table below.

Method 2 — Measure Your Finger

Cut a thin strip of paper or use a piece of string.
Wrap it snugly around the base of the finger you intend to wear the ring on.
Mark where the paper or string meets and measure the length in mm — this is your circumference.
Match to the table below.

💡 Tip: Fingers change size throughout the day — they're larger in the evening and when warm. We recommend measuring at the end of the day for the most accurate fit.

UK Ring Size Chart

UK Size	Inside Diameter (mm)	Circumference (mm)	US Size
D	14.9	46.8	3
E	15.3	48.0	3½
F	15.7	49.3	3¾
G	16.1	50.6	4
H	16.5	51.9	4½
I	16.9	53.1	4¾
J	17.3	54.4	5
K	17.7	55.7	5½
L	18.1	56.9	5¾
M	18.5	58.2	6
N	18.9	59.5	6½
O	19.3	60.8	6¾
P	19.7	62.0	7
Q	20.1	63.3	7½
R	20.5	64.6	7¾
S	20.9	65.9	8
T	21.3	67.1	8½
U	21.7	68.4	8¾
V	22.1	69.7	9
W	22.5	70.9	9½
X	22.9	72.2	10
Y	23.3	73.5	10½
Z	23.7	74.8	11

Not sure? We recommend ordering a half size up. All rings can be resized — contact us at andy@manxcrowndiamonds.com and we'll advise you.

Alexandrite Trilogy Ring

Ring Size Guide

Method 1 — Measure an Existing Ring

Method 2 — Measure Your Finger

UK Ring Size Chart

Added to Basket