Quiration

Quiration is an exclusive collection of high jewellety rings, each featuring a 1-carat diamond at the center, cut into five distinct shapes — but with a common essence: a celebration of value, precise measurement, and timeless beauty.

Inspired by the carob pod, whose seed gave rise to the word “carat” (keration, in Greek), this collection unites history, precision, and emotion in a contemporary language.

Choosing a diamond

A journey guided with care and true expertise.

At Tavares, every step is personally led by Carlos Tavares, one of Portugal’s most distinguished diamond specialists. His insight brings clarity to even the finest details.

A rare privilege, reserved for those who seek nothing less than the extraordinary.

We invite you to leave us your details below in order to tap into Carlos expertise on a one-on-one virtual consultation.

CONTACTS​

Opening hours
Mon – Sat 9:30-12:30 / 14:30-18:30

Form

Leave your details below and we will contact you.

Size Guide

Bespoke Jewelry

Many of our jewels are custom-made in our atelier, according to the dreams of those who come to us. Therefore, it is important to know the correct size and measurement of the jewel we are going to design.

If you still have doubts about the size and measurement of the ring you are going to buy:

International Equivalence Chart
for Ring Measurements

Portugal

PT

Circumference

Circ.

Inner diameter

Diam.
interior

Uk, Europe and Australia

UK
EU
AU

USA and Canada

US
CA

China, Singapure, Taiwan and Japan

CH
SG
TW
JP

Switzerland

SW

8

48 mm

15,3 mm

I

4 ½

8

9

48,7 mm

15,5 mm

J

9

10

50 mm

15,9 mm

K

10

11

51,2 mm

16,3 mm​

L

11 ¾

12

51,9 mm

16,5 mm

L ½

6

11

12 ¾

13

53,1 mm

16,9 mm

M ½

6 ½

13

14

14

54,4 mm

17,3 mm

N ½

7

14

15 ¼

15

55,1 mm

17,5 mm

16

56,3 mm

17,9 mm

P

17

57,2 mm

18,2 mm​

18

58,3 mm

18,5 mm

Q ½

8 ½

17

19

58,9 mm

18,8 mm

R

19

20

60,2 mm

19,2 mm

S

20 ¼

When placed on your finger, the ring should be comfortable so that it does not fall off, but loose enough to slide off when you want to take it off.

The size of your finger varies depending on the time of day and the weather. To obtain the best results, measure your finger:

— At the end of the day or when your finger is warm (fingers are thinner early in the morning or when the weather is cold);

— Measure your finger size 3 to 4 times to avoid possible reading errors.

To obtain more accurate measurements, you should avoid using string or paper to measure your finger size, as these materials can stretch or twist, distorting the actual measurement. If you are ordering from abroad, you can determine your ring size according to your country, using the table above, matching the Portuguese size with the international size.

Ring Sizes

Print the page here and check the scale with a ruler. Place one of your rings over the circles. The inner diameter of the ring must match the circle.

Note: Images on screen may not be to scale, please print the page.