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You didn't do it. Some numpty jeweller did. ( and hallmarking has been going in the UK since Edward I in 1300 (28 Edw. I c.20)) https://www.assayofficelondon.co.uk/about-us/history-of-hallmarking

While it doesn't add anything to the information about this ring, for non-uk readers... Defacing a hallmark is a criminal offence https://www.legislation.gov.uk/ukpga/1973/43/section/5?view=plain

Is there a hallmark and if so what information does it give?

p45

Steve, the pearls need a cup or flat surface to increase glue surface area. Just sitting on the bare peg with space underneath allows them to move and eventually the glue adhesion will fail, even if the solder joint of the peg doesn't due to stress/metal fatigue.

Peach is the default freshwater colour, so probably not dyed. Could be buttons, but very small and many not classic button shape

They are peachy coloured nicely lustrous freshwater keishi pearls. Not a huge value. If too big, size can be reduced by twisting

What's really funny is that this shade of peach looks dreadful on nearly everyone's skin so good luck with the marketing spin.

Who are 'they'? That is not red by any stretch of the language.

I can remember how things changed from one Hong Kong show to the next. First show ..a few strands of natural colour akoya tucked apologetically to the side and incredibly cheap. Next show...bosh...lots and lots of natural colour pearls with soaring prices. Japanese sellers had spotted that...

It is, totally, yuck.:sick::sick::sick::sick::sick::sick::sick:

Do a search on Aliexpress for 'wish pearl'. thousands of brightly dyed freshwater pearls in obviously dead shells. Totally yuck.

That can also be a burr when the two drill holes don't quite align. With a cheap drill bit it will bend just a fraction, not enough to break but enough for it to go out of alignment. This happens when the pearl is rounded so the tip skids just as it touches and before it bites into the nacre.

The dremel would be fine for enlarging holes (personally I use a simple hand-held ordinary domestic drill for that) You only really need a 'proper' pearl drill when full drilling as lining up the two halves would be very difficult and fraught with the chance that they will miss in the middle. I...

It is, unsurprisingly, the dearer option.

Buy top quality drill bits. The difference is incredible. Yotsuba are good and can do english, so ask

Does anyone know if the Mikimoto trade mark (not a hallmark) and metal marks are cast or punched?

They've been around for a couple of years or so. It's another Grace thing, along with dyed pretend Tahitians, mostly around 10mm (which look quite good from a distance, well matched strands with even some peacock-ery). (plus of course the dyed gold south seas and the dyed purples

Any bench jeweller could make those net findings. The construction is pretty basic, but fiddly.

Not my expertise but would not a diamond drill bit in a drill (handheld or otherwise) not be a better plan? What you need is what drilled them in the first place. What drills a diamond? I never use reamers.