Casio G-Shock GA-100-1A4ER analogue-digital black and red Watch
- Shipping within 24–48 hours
- 100% secure payment
- Free returns in store
- With a 3 year warranty
- Free shipping on orders over €75
- Payment in installments available
- Do you have any questions? Contact us
- Check in-store availability
Details
Details
This Casio men's watch combines functionality and style, featuring a durable 51 mm resin case. Its black resin strap with red detailing perfectly complements the analogue-digital dial, offering versatility for any occasion. Among its multiple features, the ability to set up to 5 alarms stands out, along with an automatic calendar that adjusts accurately. Additionally, it includes an indicator that allows the user to switch between 12 and 24-hour formats. This model also incorporates a timer, chronograph with millisecond precision, and the practical world time function, making it the ideal companion for travellers. The LED illumination ensures clear visibility in any situation, and its water resistance of up to 200 metres allows for worry-free immersion. This watch is a perfect choice for those seeking a robust, functional accessory with a modern design.
Ref. GA-100-1A4ER
Jewelry care
Jewelry care
To preserve the luster of your jewelry, it's recommended to avoid using cosmetics, cleaning products, and other chemical agents, and to clean it with a soft cloth. For professional cleaning, please visit one of our jewelry stores.
Exchanges and returns
Exchanges and returns
The return or withdrawal period is 15 days and the exchange period is 30 days, both from the date of delivery of the item.
Shipping and delivery
Shipping and delivery
Size guide
Don't know your ring size? We'll show you different ways to find the perfect size.
The size is the measurement of the ring's interior space.


How to measure your ring size at home: step-by-step guide
Method 1: Measuring an existing ring (inside diameter)
This is the most accurate method if you already have a reference ring. Follow these steps:
- You will need the ring and a ruler.
- Do not include the metal; the thickness is not considered for the measurement.
- Note the exact measurement in millimeters (mm) and look for this figure in our equivalence table, in the "Inside diameter" column.

Method 2: Measuring your finger (circumference)
If you don't have a reference ring, you can measure your finger's circumference. Follow these steps:
- You will need a string, a measuring tape, or a strip of paper and a ruler.
- We recommend measuring your finger at the end of the day to avoid swelling.
- Wrap the string, tape, or paper strip around the base of the finger on which you will wear the ring, note the exact measurement, and find it in our equivalence table.

Equivalence table
| Ring inside diameter (mm) | JOSE LUIS Joyerías Size |
|---|---|
| 15.2 mm | 8 |
| 15.5 mm | 9 |
| 15.9 mm | 10 |
| 16.2 mm | 11 |
| 16.5 mm | 12 |
| 16.8 mm | 13 |
| 17.1 mm | 14 |
| 17.4 mm | 15 |
| 17.8 mm | 16 |
| 18.0 mm | 17 |
| 18.4 mm | 18 |
| 18.7 mm | 19 |
| 19.0 mm | 20 |
| 19.3 mm | 21 |
| 19.6 mm | 22 |
| 20.0 mm | 23 |
| 20.3 mm | 24 |
You can also consult our customer service team for more information.