There are few jewelers in KL and not sure any make jewelry, particularly wedding rings. You will have a better chance in Bangkok but if you do a search on the Bangkok Forum for Jewlry Scams you will find a great many cautionary posts.
If you post the same question as this though you may get some favourable/positive replies. Also I would be concerned about having a ring made if I was only there a few days.
In Bangkok there is a huge number of jewelers with a bewildering display of items at all manner of prices.
For such an important item as a wedding ring, I'd have it made or bought at home.
I shop at the following. Absolutely reputable, and has the finest jewelry you will find. They specialize in gem stones. Shop for pure gold jewelry elsewhere. This place has 4 branches and claims to be the world's largest jewelry store. Awesome shopping experience. I always went to the one in Chiangmai.
The Gems Gallery International of Bangkok Co.,Ltd. Rama 6 Bangkok, Thailand 10400
The Gems Gallery Chiangmai Co.,Ltd.
Chiangmai Sankampaeng Rd., Sankampaeng, Chiangmai Thailand 50130
The Gems Gallery Phuket Co.,Ltd.
Chalermprakiat Rama 9 Rd., Muang, Phuket, Thailand 83000
The Gems Gallery Pattaya Co.,Ltd.
North Pattaya Rd., Banglamung, Pattaya, Chonburi, Thailand 20150
Dial From International
Tel : ++662-877-9780
Mobile : ++6681-653-3650
Tel : 02-877-9780
Mobile : 081-653-3650 (24 hour)
Email : email@example.com
They will size it as you wait. Also they have bar/club area to sit and relax while you wait, with free drinks. Fantastic selection. And yes, they have wedding rings.
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